TY - JOUR AB - In this study, we investigate quartz-based luminescence optical dating of Iron Age deposits at the archaeological site of Tell Damiyah in the Jordan valley. Ten samples, taken from different occupation layers from two different excavation areas, proved to have good luminescence characteristics (fast-component dominated, dose recovery ratio 1.032 ± 0.010, n=24). The optical ages are completely consistent with both available 14C ages and ages based on stylistic elements; it appears that this material was fully reset at deposition, although it is recognised that the agreement with age control is somewhat dependent on the assumed field water content of the samples. Further comparison with different OSL signals from feldspar, or investigations based on dose distributions from individual grains would be desirable to independently confirm the resetting of this material. It is concluded that the sediments of Tell Damiyah are very suitable for luminescence dating. Despite the relatively large associated age uncertainties of between 5 and 10%, OSL at tell sites has the potential to provide ages for material very difficult to date by conventional methods, and to identify reworked mixtures of older artifacts in a younger depositional setting. AU - al Khasawneh, Sahar AU - Murray, Andrew AU - Kafafi, Zeidan AU - Petit, Lucas DB - Cambridge Core DO - 10.1017/RDC.2019.90 DP - Cambridge University Press ET - 08/06 KW - Iron Age luminescence OSL Tell Damiyah IS - 1 PY - 2019 RN - archaeology SN - 0033-8222 SP - 1-12 JO - Radiocarbon TI - Luminescence dating of the Iron Age deposits from Tell Damiyah in the Jordan Valley UR - https://www.cambridge.org/core/article/luminescence-dating-of-the-iron-age-deposits-from-tell-damiyah-in-the-jordan-valley/34FA17172BC89A23F02E23854B3DAC3A VL - 62 ID - 167 ER - TY - JOUR AB - Fluvial terraces are common in the tectonically active western Kunlun Mountains (WKLM) region, northwestern margin of the Tibetan Plateau, and incision of rivers since 5 ka was attributed to the accelerated uplift of the WKLM. However, it is difficult to evaluate their tectonic or climatic origin without detailed chronology. In this study, Optically Stimulated Luminescence (OSL) dating was applied to fluvial/flood and aeolian sediments on five lowest fluvial terraces (49 m in total) along the Keriya River, and the 21 OSL ages (from 11 samples) revealed the incision processes since the mid-Holocene, especially the fast incision (3.5–0 ka, 10.9 mm/a) during the late Holocene. This was supported by the climatic background, i.e., increased precipitation from the westerlies and meltwater from frequent glacial advance-retreat events. As a response to the climatic changes, large-scale floods were frequent as well, e.g., at 3.5, 2.6, 0.87, and 0.25 ka, which were crucial for the fast incisions on the filling gravels. Additionally, the flood also caused the river’s further extension into the Taklamakan Desert and controlled the evolution of oases in the desert, including ancient cities and cultures. Consequently, we suggest that climatic change was important for the incision and formation of cut-in-fill terraces along the Keriya River during the Holocene, and influences from other factors, including surface uplift, should not be ignored, but were difficult to be evaluated. AU - An, Ping AU - Yu, LuPeng AU - Wang, YiXuan AU - Miao, XiaoDong AU - Wang, ChangSheng AU - Lai, ZhongPing AU - Shen, Hongyuan DA - 2020/04/15/ DO - 10.1016/j.jseaes.2019.104224 KW - Fluvial terraces OSL dating Holocene climatic change Palaeoflood Tarim Basin Knickpoint PY - 2020 RN - fluvial SN - 1367-9120 SP - 104224 JO - Journal of Asian Earth Sciences TI - Holocene incisions and flood activities of the Keriya River, NW margin of the Tibetan plateau UR - http://www.sciencedirect.com/science/article/pii/S1367912019305760 VL - 191 ID - 177 ER - TY - JOUR AB - Two different fluorite samples of Turkish origin were studied with respect to their thermoluminescence properties suitable for dosimetric applications. The fluorites are colorful and naturally occurring. Both samples indicate sensitivity comparable to the sensitivity of CaF2:N material, and PXRD and XRF measurements could help to understand the sensitivity differences between these two samples. Deconvolution and fractional glow techniques indicated useful convergent information regarding the trapping parameters of the corresponding peaks. The dose response features were studied only for the appropriate for dosimetry thermoluminescence peaks, after deconvolution, for two different cases: (a) promptly after irradiation and (b) for the residual signal after 100 s of bleaching. The results showed that specific thermoluminescence peaks of both materials could be effectively used for dosimetric applications within the dose range of 10−3–50 Gy. Finally, a specific peak with delocalization temperature 338 °C is promising for dosimetric applications within the same dose range even using the residual TL signal after 100 s illumination. AU - Atlıhan, Mehmet Altay DA - 2020/03/15/ DO - 10.1016/j.nimb.2020.02.002 KW - Fluorite TL XRF PXRD Dose response Bleaching Deconvolution FGT PY - 2020 RN - dosimetry SN - 0168-583X SP - 33-39 JO - Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms TI - Thermoluminescence properties of two natural colorful fluorite samples of Anatolian origin for dosimetric applications UR - http://www.sciencedirect.com/science/article/pii/S0168583X20300471 VL - 467 ID - 42 ER - TY - JOUR AB - High-resolution elevation surveys of deformed late Pleistocene shorelines and new luminescence dating provide improved constraints on spatiotemporal patterns of distributed slip between normal and strike-slip faulting in southern Owens Valley, eastern California. A complex array of five subparallel faults, including the normal Sierra Nevada frontal fault and the oblique-normal Owens Valley fault, collectively form an active pull-apart basin that has developed within a dextral transtensional shear zone. Spatiotemporal patterns of slip are constrained by post–IR-IRSL (post-infrared–infrared stimulated luminescence) dating of a 40.0 ± 5.8 ka highstand beach ridge that is vertically faulted and tilted up to 9.8 ± 1.8 m and an undeformed suite of 11–16 ka beach ridges. The tectono-geomorphic record of deformed beach ridges and alluvial fans indicates that both normal and dextral faulting occurred between the period of ca. 16 and 40 ka, whereas dextral faulting has been the predominant style of slip since ca. 16 ka. A total extension rate of 0.7 ± 0.2 mm/yr resolved in the N72°E direction across all faults in Owens Lake basin is within error of geodetic estimates, suggesting extension has been constant during intervals of 101–104 yr. A new vertical slip rate of 0.13 ± 0.04 m/k.y. on the southern Owens Valley fault from deformed 160 ± 32 ka shoreline features also suggests constant slip for intervals up to 105 yr when compared to paleoseismic vertical slip rates from the same fault segment. This record supports a deformation mechanism characterized by steady slip and long interseismic periods of 8–10 k.y. where the south-central Owens Valley fault and Sierra Nevada frontal fault form a parallel fault system. AU - Bacon, Steven N. AU - Bullard, Thomas F. AU - Keen-Zebert, Amanda K. AU - Jayko, Angela S. AU - Decker, David L. DO - 10.1130/B35247.1 IS - 7-8 PY - 2020 RN - lacustrine earthquake (and fault related) SN - 0016-7606 SP - 1681-1703 JO - GSA Bulletin TI - Spatiotemporal patterns of distributed slip in southern Owens Valley indicated by deformation of late Pleistocene shorelines, eastern California UR - https://doi.org/10.1130/B35247.1 VL - 132 Y2 - 7/6/2020 ID - 176 ER - TY - JOUR AB - A continuous lake-level curve was constructed for Owens Lake, eastern California by integrating lake-core data and shoreline geomorphology with new wind-wave and sediment entrainment modeling of lake-core sedimentology. This effort enabled refinement of the overflow history and development of a better understanding of the effects of regional and global climate variability on lake levels of the paleo-Owens River system during the last 50,000 years. The elevations of stratigraphic sites, plus lake bottom and spillway positions were corrected for vertical tectonic deformation using a differential fault-block model to estimate the absolute hydrologic change of the watershed-lake system. New results include 14C dating of mollusk shells in shoreline deposits, plus post-IR-IRSL dating of a suite of five beach ridges and OSL dating of spillway alluvial and deltaic deposits in deep boreholes. Geotechnical data show the overflow area is an entrenched channel that had erodible sills composed of unconsolidated fluvial-deltaic and alluvial sediment at elevations of ∼1113–1165 m above mean sea level. Owens Lake spilled most of the time at or near minimum sill levels, controlled by a bedrock sill at ∼1113 m. Nine major transgressions at ∼40.0, 38.7, 23.3, 19.3, 15.6, 13.8, 12.8, 11.6, and 10.6 ka reached levels ∼10–45 m above the bedrock sill. Several major regressions at or below the bedrock sill from 36.9 to 28.5 ka, and at ∼17.8, 12.9, and 10.4–8.8 ka indicate little to no overflow during these times. The latest period of overflow occurred ∼10–20 m above the bedrock sill from ∼8.4 to 6.4 ka that was followed by closed basin conditions after ∼6.4 ka. Previous lake core age-depth models were revised by accounting for sediment compaction and using no reservoir correction for open basin conditions, thereby reducing discrepancies between Owens Lake shoreline and lake-core proxy records. The integrated analysis provides a continuous 50 ka lake-level record of hydroclimate variability along the south-central Sierra Nevada that is consistent with other shoreline and speleothem records in the southwestern U.S. AU - Bacon, Steven N. AU - Jayko, Angela S. AU - Owen, Lewis A. AU - Lindvall, Scott C. AU - Rhodes, Edward J. AU - Schumer, Rina A. AU - Decker, David L. DA - 2020/06/15/ DO - 10.1016/j.quascirev.2020.106312 KW - Late Pleistocene Holocene Owens Lake Searles Lake Sierra Nevada Paleoclimatology Hydroclimatic variability Lake-level reconstruction Shorelines PY - 2020 RN - lacustrine SN - 0277-3791 SP - 106312 JO - Quaternary Science Reviews TI - A 50,000-year record of lake-level variations and overflow from Owens Lake, eastern California, USA UR - http://www.sciencedirect.com/science/article/pii/S0277379120302742 VL - 238 ID - 139 ER - TY - CHAP A2 - Bertrand, Patrick AB - Natural or artificial irradiation of certain solid materials generates paramagnetic centres, free radicals, defects or ions, which are stable enough to be identified and quantified by EPR. The irradiation dose can be assessed from the intensity of the spectrum, which opens opportunities for numerous applications such as dosimetry of radiation used in radiotherapy or to sterilise food, determination of the dose received by individuals during chronic exposure or radiological accidents, or even to date archaeological samples. AU - Bahain, J. J. AU - Dolo, J. M. AU - Falguères, C. AU - Garcia, T. AU - Trompier, F. CY - Cham DO - 10.1007/978-3-030-39668-8_1 PB - Springer International Publishing PY - 2020 RN - ESR review SN - 978-3-030-39668-8 SP - 1-28 ST - Dosimetry of ionising radiation T2 - Electron Paramagnetic Resonance Spectroscopy: Applications TI - Dosimetry of ionising radiation UR - https://doi.org/10.1007/978-3-030-39668-8_1 ID - 29 ER - TY - JOUR AB - Résumé Dans le cadre de cette étude, la chronologie de plusieurs gisements intralœssiques du Paléolithique supérieur et moyen, situés en Moldavie, en Dobrogea et dans la plaine orientale du Danube, a été réexaminée et précisée en s’appuyant sur de nouvelles données chronologiques (dates IRSL sur lœss et dates ESR/U-Th sur dents) ainsi que sur des arguments biostratigraphiques et pédostratigraphiques. Des témoins d’occupation du Paléolithique moyen ont été mis au jour dans le lœss L2 du SIM 6 (épisode interstadiaire), le pédocomplexe S2 du SIM 7 et le pédocomplexe de sols rougeâtres S3 vraisemblablement attribué au SIM 9. Ces résultats nous amènent à reconsidérer l’étendue chronologique du Paléolithique moyen de Roumanie qui jusqu’au début des années 2000 (Păunescu, 1999a, b ; Cârciumaru, 1999) était limitée au Pléistocène supérieur (chronologie courte : 130–35ka ; SIM 5-SIM 3). Nous démontrons donc ici la présence de traces d’occupation humaine dès le Pléistocène moyen à la périphérie orientale des Carpates roumaines, le long de la vallée du Danube et de son affluent le Prut. In the present study, the chronology of several intraloessic Upper and Middle Palaeolithic sites, located in Moldova, Dobrogea and the eastern Danube Plain, is re-examined and better defined on the basis of new chronological data (IRSL ages on loess, ESR/U-Th ages on teeth) and also biostratigraphic and pedostratigraphic evidence. Middle Palaeolithic occupations have been identified in the MIS 6 loess L2 (interstadial episode), the MIS 7 pedocomplex S2 and the red soils S3 presumably assigned to MIS 9. These results are questioning the chronological extension of the Middle Palaeolithic in Romania which until early 2000 (Păunescu, 1999 a, b; Cârciumaru, 1999) was restricted to the Upper Pleistocene (short chronology: 130–35ka; MIS 5-MIS 3). Hence, we demonstrate herein that Humans were already present during the Middle Pleistocene at the eastern periphery of the Carpathian Mountains, along the Danube valley and its tributary, the Prut River. AU - Balescu, Sanda AU - Tuffreau, Alain AU - Dobrescu, Roxana AU - Auguste, Patrick AU - Bahain, Jean-Jacques AU - Lamothe, Michel AU - Petculescu, Alexandru AU - Shao, Qingfeng DA - 2018/04/01/ DO - 10.1016/j.anthro.2018.02.001 KW - Paléolithique Lœss Datation IRSL Datation ESR/U-Th Roumanie Paleolithic Loess IRSL Dating ESR/U-Th dating Romania IS - 2 N1 - Préhistoire de la Roumanie PY - 2018 RN - loess SN - 0003-5521 SP - 87-110 JO - L'Anthropologie TI - Nouvelles données sur la chronologie des sites paléolithiques en contexte lœssique du Nord-Est et du Sud-Est de la Roumanie (Périphérie orientale des Carpates) UR - http://www.sciencedirect.com/science/article/pii/S0003552118300165 VL - 122 ID - 99 ER - TY - JOUR AB - Lake Mungo is a currently dry lake basin in the semi-arid zone of southeastern Australia. The transverse dune system on the downwind side contains a record of human occupation of international importance. It also contains one of the most continuous records of climate change over the last glacial cycle in the Australia desert. In this paper we provide a framework for the interpretation of lake level history from before the arrival of people (>41 ka) until after the establishment of the pastoral industry in the area. We present 83 optically stimulated luminescence ages from the Lake Mungo lunette. The lake level history is reconstructed from 34 stratigraphic sections along three transects through the lunette. The dating reveals considerable lake level fluctuations through time which occur over a depth range of ∼10 m in the basin. At its height, probably at multiple times before 20 ka, the lake held more than 1 km3 of water and at its final level at ∼19 ka, contained only 0.03 km3. The inception of Lake Mungo appears to have taken place during the mid-Pleistocene between ∼256 and 369 ka. During the last glacial cycle, Lake Mungo was almost continuously wetter than present from shortly after 60 ka until ∼19 ka. The Upper Mungo, Arumpo and Zanci units represent a succession of lake filling and drying events, briefly interspersed by soils. The final Zanci unit does not represent a single high lake phase, but an initial lake filling followed by a series of short-lived lake level events within a brief period of a few thousand years. At the conclusion of this event, the lake remained dry until the present day. Four OSL ages from a linear dune upwind of Lake Mungo indicates regional aeolian activity from ∼30 ka until present. Widespread erosion that produces the characteristic topography of the lunette began after the arrival of British pastoralists and traditional aboriginal ways of life overlapped briefly with this erosion. The presence of water in Lake Mungo closely corresponds to periods when regional surface temperature was colder than present during the late Pleistocene. Our new data supports a model that decreased evaporation and increased runoff were primarily responsible for increased availability of surface water in the hydrological cycle. AU - Barrows, Timothy T. AU - Fitzsimmons, Kathryn E. AU - Mills, Stephanie C. AU - Tumney, Jacqui AU - Pappin, Daryl AU - Stern, Nicola DA - 2020/06/15/ DO - 10.1016/j.quascirev.2020.106338 KW - Lake Mungo Optically stimulated luminescence Lake levels Australia Arid zone Pleistocene PY - 2020 RN - lacustrine SN - 0277-3791 SP - 106338 JO - Quaternary Science Reviews TI - Late Pleistocene lake level history of Lake Mungo, Australia UR - http://www.sciencedirect.com/science/article/pii/S0277379120303000 VL - 238 ID - 138 ER - TY - JOUR AB - Due to their sensitivity to both tectonic activity and climatic variations, coastal alluvial fans (CAF) along the western flank of the Coastal Cordillera in the Atacama Desert (northern Chile) are important geo-archives for unravelling Quaternary environmental change. Our study focuses on terrestrial and marine deposits of five CAF complexes between 20° and 25°S along the coastal zone of the Atacama to identify phases of alluvial fan activity during the Late Quaternary. Based on a combination of luminescence dating and 10Be cosmogenic nuclide exposure dating as well as existing chronological data in the area, insights into climatic variations along the hyper-arid coast are presented for the Late Pleistocene derived from CAF morphodynamics. Activity of alluvial fans could be documented during time spans 95–80 ka, 60–45 ka, 35–20 ka, as well as the Holocene. Numerical dating of marine terrace deposits gives insights into the tectonic uplift of the Coastal Plain in northern Chile during the Late Quaternary period, for which estimated uplift rates between ~0.06 and ~0.57 m/ka were derived. While tectonic activity induces base-level changes, long-term tectonic activity rather indirectly controls alluvial fan activity. We suggest that alluvial fan activity is mainly controlled by atmospheric changes from the Pacific Ocean. Based on our observations, CAF in the hyper-arid Atacama Desert serve as suitable geo-archives for reconstructing climate changes during the Quaternary. In particular, the usefulness of alluvial fan systems in a water-limited environment is important for understanding the palaeoenvironmental evolution in a coastal desert. AU - Bartz, Melanie AU - Walk, Janek AU - Binnie, Steven A. AU - Brill, Dominik AU - Stauch, Georg AU - Lehmkuhl, Frank AU - Hoffmeister, Dirk AU - Brückner, Helmut DA - 2020/07/01/ DO - 10.1016/j.gloplacha.2019.103091 KW - Atacama Desert Luminescence dating Cosmogenic nuclide dating Alluvial fans Marine terraces Palaeoclimate Tectonic uplift PY - 2020 RN - coastal SN - 0921-8181 SP - 103091 JO - Global and Planetary Change TI - Late Pleistocene alluvial fan evolution along the coastal Atacama Desert (N Chile) UR - http://www.sciencedirect.com/science/article/pii/S0921818119305764 VL - 190 ID - 159 ER - TY - BOOK AB - Luminescence dating is now widely applied by scientists working in Quaternary geology and archaeology to obtain ages for events as diverse as past earthquakes, desertification and cave occupation sites. Using quartz or feldspar minerals found in almost ubiquitous sand and finer sediments, luminescence can provide ages from over 500,000 years ago to modern. Written by some of the foremost experts in luminescence dating from around the world, this book takes a new approach. It explains what luminescence can and can’t do, what and where to sample, types of measurements available and how to interpret and analyse ages once they are measured. It is accordingly for scientists who require luminescence ages for their research rather than those scientists developing the luminescence technique or making their own luminescence measurements. The background to the technique is explained in simple terms so that the range of potential applications, limits and issues can be understood. The book helps scientists plan where and what to sample to optimise the successful application of luminescence and stemming from that the chronologies that can be constructed. The Handbook sets out the challenges and limitations when applying luminescence dating in different environmental and archaeological settings and gives practical advice on how issues might be avoided in sampling, or mitigated by requesting different laboratory measurement approaches or analysis. Guidance is provided on how luminescence ages can be interpreted and published as well as how they can be used within chronological frameworks. With luminescence dating continuing to develop, information on more experimental approaches is given which may help expand the range of chronological challenges to which luminescence dating can be routinely applied chapters list: 1. Principles and History of Luminescence Dating / Regina DeWitt 2. From Sampling to Reporting / Mark D. Bateman 3. Incorporating Luminescence Ages into Chronometric Frameworks / Laine Clark-Balzan 4. Applications in Aeolian Environments / Kathryn E. Fitzsimmons 5. Applications in Loessic Environments / Thomas Stevens 6. Applications in Glacial and Periglacial Environments / Mark D. Bateman 7. Applications in Fluvial and Hillslope Environments / Markus Fuchs 8. Applications to Coastal and Marine Environments / Simon J. Armitage 9. Applications of Luminescence Dating to Active Tectonic Contexts / Richard T. Walker 10. Applications in Archaeological Contexts / Ian K. Bailiff 11. Rock Surface Burial and Exposure Dating / Benjamin Lehmann AU - Bateman, Mark D. PY - 2019 RN - review SE - 416 SN - 9781849953955 ST - Handbook of luminescence dating TI - Handbook of luminescence dating UR - https://www.whittlespublishing.com/Handbook_of_Luminescence_Dating ID - 104 ER - TY - JOUR AB - Deconvolution analysis of the thermoluminiscent (TL) glow curves proved to be a good complementary method to characterize the individual glow peaks by fitting their kinetic parameters. In this work, new software has been developed for the automatic deconvolution of TL glow curves, assuming either discrete or continuous distribution of trapping centres. The guess estimation of the kinetic parameters is done automatically and can be manually modified, thus allowing the use of the software for routine, processing a large number of measurements, as well as for research purposes. The equations, the methods and the results of the first test are described in detail. The software has been developed by integrating Fortran code and Visual Studio tools to create a graphic easy-to-use environment and permits to obtain the fitted values for the parameters according to the considered model. AU - Benavente, J. F. AU - Gómez-Ros, J. M. AU - Romero, A. M. DA - 2019/11/01/ DO - 10.1016/j.apradiso.2019.108843 KW - Thermoluminescence Glow curve Deconvolution Thermoluminescent dosimetry PY - 2019 RN - basic research SN - 0969-8043 SP - 108843 JO - Applied Radiation and Isotopes TI - Thermoluminescence glow curve deconvolution for discrete and continuous trap distributions UR - http://www.sciencedirect.com/science/article/pii/S0969804319303355 VL - 153 ID - 86 ER - TY - JOUR AB - The deconvolution of thermoluminescence (TL) glow curves into a sum of individual peaks described by First Order Kinetic (FOK) equations, implies that retrapping probability should be negligible compared with recombination during the readout (to avoid non-linearity) but not during irradiation (to allow the filling of the traps with the produced electron-hole pairs). In this contribution, some examples of TL glow curves simulated using a general model are discussed to show that FOK shape and deconvolution into individual glow peaks fitted by FOK equations is compatible with a non-negligible traps filling process during irradiation with the appropriate choice of kinetic parameters and probability factors. AU - Benavente, J. F. AU - Gómez-Ros, J. M. AU - Romero, A. M. DA - 2020/05/01/ DO - 10.1016/j.radphyschem.2019.108671 KW - Thermoluminescence First order kinetics Simulations PY - 2020 RN - basic research SN - 0969-806X SP - 108671 JO - Radiation Physics and Chemistry TI - Numerical analysis of the irradiation and heating processes of thermoluminescent materials UR - http://www.sciencedirect.com/science/article/pii/S0969806X19309600 VL - 170 ID - 50 ER - TY - BOOK AU - Bertrand, Patrick DO - 10.1007/978-3-030-39663-3 PB - Springer PY - 2020 RN - ESR review SP - 422 ST - Electron paramagnetic resonance spectroscopy T2 - Fundamentals TI - Electron paramagnetic resonance spectroscopy ID - 28 ER - TY - JOUR AB - Karst caves host most European Paleolithic sites. Near the Eurasian-Arabian Plate convergence in the Caucasus' Lower Chegem Formation, Saradj-Chuko Grotto (SCG), a lava tube, contains 16 geoarchaeologically distinct horizons yielding modern to laminar obsidian-rich Middle Paleolithic (MP) assemblages. Since electron spin resonance (ESR) can date MP teeth with 2–5% uncertainty, 40 sediment samples were analyzed by neutron activation analysis to measure volumetrically averaged sedimentary dose rates. SCG’s rhyolitic ignimbrite walls produce very acidic clay-rich conglomeratic silts that retain 16–24 wt% water today. In Layers 6A-6B, the most prolific MP layers, strongly decalcified bones hinder species identification, but large ungulates inhabited deciduous interglacial forests. Unlike in karst caves, most SCG's layers had sedimentary U concentrations > 4 ppm and Th, > 12 ppm, but Layer 6B2 exceeded 20.8 ppm U, and Layer 7, > 5 ppm Th. Such high concentrations emit dose rates averaging ~ 1.9–3.7 mGy/y, but locally up to 4.1–5.0 mGy/y. Within Layer 6, dose rate variations reflect bone occurrence, necessitating that several samples must be geochemically analyzed around each tooth to ensure age accuracy. Coupled with dentinal dose rates up to 3.7–4.5 mGy/y, SCG's maximum datable ages likely averages ~ 500–800 ka. AU - Blackwell, A. B. Bonnie AU - Kazi, F. Mehak AU - Huang, L. C. Clara AU - Doronicheva, V. Ekaterina AU - Golovanova, V. Liubov AU - Doronichev, B. Vladimir AU - Singh, K. C. Impreet AU - Blickstein, I. B. Joel DO - 10.3390/mps3010020 KW - ESR dating sedimentary dosimetry Saradj-Chuko Grotto (SCG), Russia lava tube Middle Paleolithic IS - 1 PY - 2020 RN - archaeology ESR SN - 2409-9279 SP - 20 JO - Methods and Protocols TI - Sedimentary dosimetry for the Saradj-Chuko Grotto: A cave in a Lava Tube in the North-Central Caucasus, Russia VL - 3 ID - 44 ER - TY - JOUR AB - ESR (electron spin resonance) can date sites that span the whole Paleolithic, but requires accurate sedimentary dose rates, especially in caves where the internal and cosmic dose rates can approach 0 mGy/yr. This study examines the sedimentary radioactivity in the upper layers at Golema Pešt, North Macedonia. Reaching > 5.5 m deep, > 21 flatly lying, silty-sandy matrix-supported gravel layers with éboulis clasts fill the cave. In Sondage 2, Layers 0–5 contained many hearths and yielded thousands of bones and teeth, many from ungulates. In Layers 2-5a sat thousands of lithics and small tools, many made on tiny quartz crystals. Layers 2c-6 have Mousterian assemblages with denticulates, notched tools, Levallois cores and flakes. To measure the volumetrically averaged sedimentary dose rates for ungulate teeth dated by ESR from Sondage 2, 66 sediment samples were analyzed by NAA. Adding éboulis, calcined bone, and charcoal associated with the hearths lowered the sedimentary dose rates or left them unchanged. In Layer 2 at 198 cm below the cave datum, the Campanian Ignimbrite (CI) cryptotephra occurred, where it caused abnormally high sedimentary U, Th, and K concentrations and dose rates. Since the CI tephra lay 28–30 cm above AT77, a tooth dated from Layer 3, using time- and volumetrically averaging increased AT77’s sedimentary dose rate by 32%, and dropped its calculated age by 25%. Analyzing the sedimentary compositions at every 2 cm in Layers 0–2 yielded a highly detailed stratigraphy that reduced the uncertainty in the sedimentary dose rates and the ESR ages, but more detailed geochemical analyses must be completed within the lower layers in Sondage 2. AU - Blackwell, Bonnie A. B. AU - Šalamanov-Korobar, Ljiljana AU - Huang, Clara L. C. AU - Zhuo, Jialin L. AU - Kitanovski, Blagoja AU - Blickstein, Joel I. B. AU - Florentin, Jonathan A. AU - Vasilevski, Sasko DO - 10.1093/rpd/ncz183 IS - 1 PY - 2019 RN - archaeology ESR SN - 0144-8420 SP - 94-112 JO - Radiation Protection Dosimetry TI - Sedimentary radioactivity in an upper paleolithic-middle paleolithic (MP-UP) transition site: Increasing ESR tooth dating accuracy at Golema Pešt, North Macedonia UR - https://doi.org/10.1093/rpd/ncz183 VL - 186 Y2 - 6/30/2020 ID - 155 ER - TY - JOUR AB - In Quaternary studies, tephras are widely used as marker horizons to correlate geological deposits. Therefore, accurate and precise dating is crucial. Among radiometric dating techniques, luminescence dating has the potential to date tephra directly using glass shards, volcanic minerals that formed during the eruption or mineral fragments that originate from the shattered country rock. Moreover, sediments that frame the tephra can be dated to attain an indirect age bracket. A review of numerous luminescence dating studies highlights the method's potential and challenges. While reliable direct dating of volcanic quartz and feldspar as a component in tephra is still methodically difficult mainly due to thermal and athermal signal instability, red thermoluminescence of volcanic quartz and the far-red emission of volcanic feldspar have been used successfully. Furthermore, the dating of xenolithic quartz within tephra shows great potential. Numerous studies date tephra successfully indirectly. Dating surrounding sediments is generally straightforward as long as samples are not taken too close to the tephra horizons. Here, issues arise from the occurrence of glass shards within the sediments or unreliable determination of dose rates. This includes relocation of radioelements, mixing of tephra into the sediment and disregarding different dose rates of adjacent material. AU - Bösken, Janina Johanna AU - Schmidt, Christoph DO - 10.1002/jqs.3160 IS - 1-2 PY - 2020 RN - tephra (and volcanic related) review SN - 0267-8179 SP - 39-53 JO - Journal of Quaternary Science TI - Direct and indirect luminescence dating of tephra: A review UR - https://onlinelibrary.wiley.com/doi/abs/10.1002/jqs.3160 VL - 35 ID - 89 ER - TY - JOUR AB - Surficial iron-rich deposits (ferricretes) occur on and around Burringurrah (Mount Augustus), a huge, remote inselberg in the Gascoyne district of Western Australia. Oriented NW-SE, Burringurrah is approximately 14 km long, 5 km wide, rises to 1105 m above sea level and stands some 700 m above the surrounding plain. The majority of the ferricretes occupy bedrock valley bottom floors on the southern side of the inselberg at Edney Springs, Flintstone Creek, and on the Edney Trail where they have formed on unweathered quartzose Mount Augustus Sandstone, which only contains a few percent Fe2O3. At ‘The Pound’, a boulder ferricrete overlies deeply weathered igneous bedrock, unroofed by erosion of the overlying Mount Augustus Sandstone, exposing the unconformity between the weathered granitic bedrock and the Mount Augustus Sandstone in the core of a broad, asymmetrical and doubly plunging anticline. On the northern, steeper, side of the mountain, vermiform and conglomeratic ferricretes are sparsely exposed in drainage lines. Ferricrete mineralogy is dominated by goethite with only small amounts of hematite. Oxygen isotope inferred ages of weathered monzogranite produced a top-down weathering front extending up to the Neogene at an elevation coincident with the ferricretes within bedrock valley bottoms. Beyond the mountain, the age of ferricreted sandy alluvium was established by thermoluminescence polymineral fine grain dating. These produced a minimum depositional age of >37.6 ± 2.6 ka and a second finite age of 139 ± 44 ka, suggesting ferricrete formation here may have begun during the last interglacial period and continued throughout the late Pleistocene. Formation of ferricretes on top of iron-poor quartzites is unusual. It reflects not only the absolute accumulation of iron oxides derived from the Mount Augustus Sandstone but possibly the additional contributions of iron-bearing aeolian dust from the surrounding plains subsequently washed down drainage lines to accumulate in swampy depressions at the foot of the inselberg. Ferricrete formation was initially simple, with iron in solution impregnating sandy sediment and organic host materials, sporadically impacted by bioturbation by termites. Thin-section petrography reveals an interesting form of in-situ, self-brecciation of quartz and feldspar clasts, which are fractured and infilled with iron oxides and newly precipitated clay which further promotes fragmentation. The mode of ferricrete formation described from Burringurrah is relevant to the laterite-ferricrete debate, for here it is most unlikely that the zones of iron enrichment developed in situ and vertically above the iron-poor quartzite basement as in the sense of the regional ‘classic laterite profile’. AU - Bourman, Robert P. AU - Buckman, Solomon AU - Chivas, Allan R. AU - Ollier, Clifford D. AU - Price, David M. DA - 2020/04/01/ DO - 10.1016/j.geomorph.2019.107017 KW - Ferricrete Laterite Regolith Inselberg Burringurah (Mt Augustus) Weathering Luminescence dating PY - 2020 RN - soil SN - 0169-555X SP - 107017 JO - Geomorphology TI - Ferricretes at Burringurrah (Mount Augustus), Western Australia: Proof of lateral derivation UR - http://www.sciencedirect.com/science/article/pii/S0169555X19305082 VL - 354 ID - 66 ER - TY - JOUR AB - Coasts on active subduction zones are recurrently affected by great earthquakes and associated tsunamis. Deposits resulting from both tidal inundation after coseismic subsidence and from tsunamis can be radiocarbon dated to infer patterns of earthquake and tsunami recurrence. Yet, finding suitable plant material for radiocarbon dating is not always easy. Luminescence dating provides a more ubiquitously applicable approach, but in such settings remains challenging due to three main reasons: (i) The quartz and feldspar minerals formed on active subduction zones tend to show inadequate luminescence properties; (ii) tsunami deposits may be affected by incomplete resetting of luminescence signals; and (iii) the dosimetry in sequences of tsunami and tidal sand sheets intercalated in marsh soils is often complicated. To evaluate the impact of these factors on luminescence dating accuracy, we re-date previously historically-constrained and radiocarbon dated tsunami and post-earthquake tidal deposits marking some predecessors of the giant 1960 Chile earthquake. While the impact of complex dosimetry on luminescence ages was negligible for both quartz and feldspar, the selection of an appropriate luminescence signal and aliquot size was crucial for generating robust chronologies. Due to unstable luminescence signals, quartz optically stimulated luminescence (OSL) ages and fading corrected infrared-stimulated (IR50) feldspar ages significantly underestimate the control ages. Only post-infrared-infrared (pIRIR150) signals of feldspar provide ages without any systematic age underestimation. Incomplete signal resetting was successfully addressed by using small aliquots in combination with the bootstrapped minimum age model. Remaining remnant ages of a few decades to a few centuries for the historical 1960 and 1575 tsunami sand sheets reflect a combination of laboratory residuals and incomplete signal resetting. Our results show that low-temperature pIRIR dating of feldspar is a valuable tool for reconstructing late Holocene earthquake chronologies in regions where quartz is geologically young, volcanic in origin, and holds few transportation cycles, as it occurs in active subduction zones. Although relatively large residual doses introduce dating uncertainties for sediments younger than a few centuries, feldspar pIRIR dating appears to be a good alternative to radiocarbon dating. On the contrary, quartz OSL and feldspar infrared ages were associated with systematic age underestimation, making them problematic for obtaining adequate chronologies in this type of geologic setting. AU - Brill, Dominik AU - Cisternas, Marco DA - 2020/06/01/ DO - 10.1016/j.quageo.2020.101080 KW - Luminescence dating Post-infrared-infrared Tsunami deposit Paleoseismology 1960 Chile earthquake Dose rate heterogeneity PY - 2020 RN - coastal SN - 1871-1014 SP - 101080 JO - Quaternary Geochronology TI - Testing quartz and feldspar luminescence dating to determine earthquake and tsunami recurrence in the area of the giant 1960 Chile earthquake UR - http://www.sciencedirect.com/science/article/pii/S1871101420300297 VL - 58 ID - 146 ER - TY - JOUR AB - The catastrophic storm surge of tropical cyclone Nargis in May 2008 demonstrated Myanmar's exposure to coastal flooding. The investigation of sediments left by tropical cyclone Nargis and its predecessors is an important contribution to prepare for the impact of future tropical cyclones and tsunamis in the region, because they may extend the database for long-term hazard assessment beyond the relatively short instrumental and historical record. This study, for the first time, presents deposits of modern and historical tropical cyclones and tsunamis from the coast of Myanmar. The aim is to establish regional sedimentary characteristics that may help to identify and discriminate cyclones and tsunamis in the geological record, and to document post-depositional changes due to tropical weathering in the first years after deposition. These findings if used to interpret older deposits will extend the existing instrumental record of flooding events in Myanmar. Evaluating deposits that can be related to specific events, such as the 2006 tropical cyclone Mala and the 2004 Indian Ocean tsunami, indicates similar sedimentary characteristics for both types of sediments. Landward thinning and fining trends, littoral sediment sources and sharp lower contacts allow for the differentiation from underlying deposits, while discrimination between tropical cyclone and tsunami origin is challenging based on the applied methods. The modern analogues also demonstrate a rather low preservation potential of the sand sheets due to carbonate dissolution, formation of organic top soils, and coastal erosion. However, in coastal depressions sand sheets of sufficient thickness (>10 cm) may be preserved where the shoreline is prograding or stable. In the most seaward swale of a beach-ridge plain at the Rakhine coast, two sand sheets have been identified in addition to the deposits of 2006 tropical cyclone Mala. Based on a combination of optically stimulated luminescence, radiocarbon and 137Cs dating, the younger sand layer is related to 1982 tropical cyclone Gwa, while the older sand layer is most probably the result of an event that took place prior to 1950. Comparison with historical records indicates that the archive is only sensitive to tropical cyclones of category 4 (or higher) with landfall directly in or a few tens of kilometres north of the study area. While the presented tropical cyclone records are restricted to the last 100 years, optically stimulated luminescence ages of the beach ridges indicate that the swales landward of the one investigated in this study might provide tropical cyclone information for at least the past 700 years. AU - Brill, Dominik AU - Seeger, Katharina AU - Pint, Anna AU - Reize, Felix AU - Hlaing, Kay Thwe AU - Seeliger, Martin AU - Opitz, Stephan AU - Win, Khin Mi Mi AU - Nyunt, Win Thuzar AU - Aye, Nilar AU - Aung, Aung AU - Kyaw, Kyaw AU - Kraas, Frauke AU - Brückner, Helmut DA - 2020/04/01 DO - 10.1111/sed.12586 KW - Hazard assessment luminescence dating palaeotempestology storm deposit tropical cyclone tsunami deposit IS - 3 PY - 2020 RN - coastal SN - 0037-0746 SP - 1431-1459 JO - Sedimentology TI - Modern and historical tropical cyclone and tsunami deposits at the coast of Myanmar: Implications for their identification and preservation in the geological record UR - https://doi.org/10.1111/sed.12586 VL - 67 Y2 - 2020/03/24 ID - 61 ER - TY - JOUR AB - Determining the most appropriate luminescence protocol, coupled with suitable data processing methods, for dating recently deposited sediments (<200 years) is important for identifying episodes of sediment movement and interpreting historical landscape dynamics. Issues of partial bleaching, dim luminescence signals and the incorrect application of rejection criteria, can lead to inaccurate and imprecise ages of recent sediment deposition. This study first compares the performance of quartz optically stimulated luminescence (OSL) and K-feldspar post-IR IRSL (pIRIR) measurements in a series of dose recovery preheat plateau, bleachability and remnant dose tests. Sediments of known historical age are used to identify the most suitable aliquot size and age model choice for further application on near-surface aeolian dune sediments from the Nebraska Sandhills. Results show that the ideal conditions for measuring these aeolian sediments are small aliquots (2 mm) of either quartz or K-feldspar coupled with the relevant protocols (OSL130 pIRIR170) and the unlogged-CAM and unlogged-MAM respectively. Results of 4 ± 7 years (quartz) and 4 ± 8 years (K-feldspar) are in excellent agreement with aeolian sediments of known age 5–6 years. Additionally, we find a revised set of rejection criteria is useful for accurately identifying the appropriate aliquots or grains for reliable age estimation. Sensitivity testing of recuperation rejection criteria highlights the caution that should be taken to avoid arbitrarily applying rejection criteria and biasing towards age overestimations. AU - Buckland, Catherine E. AU - Bailey, Richard M. AU - Thomas, David S. G. DA - 2019/07/01/ DO - 10.1016/j.radmeas.2019.106131 KW - pIRIR Young sediments Luminescence Natural residual De(t) PY - 2019 RN - aeolian SN - 1350-4487 SP - 106131 JO - Radiation Measurements TI - Using post-IR IRSL and OSL to date young (< 200 yrs) dryland aeolian dune deposits UR - http://www.sciencedirect.com/science/article/pii/S1350448718301902 VL - 126 ID - 47 ER - TY - JOUR AB - The Sierra Madre fault system accommodates contraction within a large restraining bend area of the San Andreas fault along the northern margin of the Los Angeles metropolitan area in southern California. Reverse slip along this fault system during earthquakes controls growth of the San Gabriel Mountains and poses a significant seismic hazard to the region. Here, we measure the late Quaternary slip rate of the Central Sierra Madre fault (CSMF) using analysis of high-resolution topography combined with cosmogenic 10Be surface exposure dating and post-IR IRSL geochronology. We mapped terrace and fan surfaces from three drainages that cross the CSMF and correlate them based on deposit character and geomorphic position. Cosmogenic nuclide and luminescence ages are consistent amongst the three prominent surfaces offset ∼5 to 28 m across the fault zone. Age estimates for these surfaces are 53 +21/−15 ka, 35 ± 9 ka, and 12±5 ka based on data from two dating methods at three locations, refined by inset age relationships. Estimated slip for these geomorphic markers is more uncertain than the measured vertical separation due to uncertainties in fault dip and ranges from 7.5 +5.4/−3.1 m to 58.5 +46.3/−14.4 m. Incremental dip-slip rate estimates from different age surfaces and locations overlap within uncertainty, with median values ranging from 0.6 to 1.1 mm/yr. The average slip rate for all three generations of markers is 1.1 +1.1/−0.4 mm/yr. This late Quaternary slip rate for the CSMF is slower than estimates based on interseismic geodetic data, and emphasizes the importance of contraction distributed across multiple structures south of the Sierra Madre fault when assessed against the geodetic shortening budget. Despite being the central portion of the broader Sierra Madre fault system, the CSMF has a slip rate similar to or lower than neighboring sections, suggesting that slip transfer onto other nearby faults control the along-strike pattern of deformation rate. Paleoseismic evidence indicates that the last earthquake on the CSMF was in the early Holocene, and the slip rate we estimate suggests that the accumulated elastic strain could produce many meters of slip in future earthquakes. AU - Burgette, Reed J. AU - Hanson, Austin M. AU - Scharer, Katherine M. AU - Rittenour, Tammy M. AU - McPhillips, Devin DA - 2020/01/15/ DO - 10.1016/j.epsl.2019.115907 KW - reverse faulting Be surface exposure dating p-IR IRSL luminescence dating terraces lidar seismic cycle deformation PY - 2020 RN - earthquake (and fault related) SN - 0012-821X SP - 115907 JO - Earth and Planetary Science Letters TI - Late Quaternary slip rate of the Central Sierra Madre fault, southern California: Implications for slip partitioning and earthquake hazard UR - http://www.sciencedirect.com/science/article/pii/S0012821X19305990 VL - 530 ID - 83 ER - TY - JOUR AB - There are about thousands of shell-mounds (sambaqui in Portuguese) along the Brazilian sea coast. They have been built by sea water and therefore geologists used sambaquis positions to indicate sea level in the past. In the state of Santa Catarina in southern Brazil Ca. 60 very large sambaquis are found. One of them near the town of Tubarão is called Congonhas II. In this work we carried out OSL and EPR dating of moluscus shells and sediments collected from Congonhas II from its base and from a point at higher position. For the samples from basal position of Congonhas II ages from 3850 ± 340 to 4040 ± 270 years and samples from higher position age of about 3300 ± 230 to 3400 ± 510 years have been obtained. These results agree with radiocarbon dates and geologically expected data relative to past sea level fluctuation. AU - Cano, Nilo F. AU - Ayala-Arenas, Jorge S. AU - Javier-Ccallata, Henry S. AU - Watanabe, Shigueo DA - 2020/02/01/ DO - 10.1016/j.radphyschem.2019.03.044 KW - Congonhas II sambaqui Dating OSL EPR N1 - Special issue dedicated to the 14th International Symposium on Radiation Physics PY - 2020 RN - ESR coastal SN - 0969-806X SP - 108240 JO - Radiation Physics and Chemistry TI - OSL and EPR dating of shells and sediments from Congonhas II sambaqui, Santa Catarina, Brazil UR - http://www.sciencedirect.com/science/article/pii/S0969806X1831168X VL - 167 ID - 85 ER - TY - JOUR AB - In the Alpine foreland and the Vienna Basin loess-paleosol sequences (LPS) are common. Some of the most famous LPS sites in the circum-Alpine area include Stratzing, Göttweig, Willendorf, Krems-Wachtberg, and Stillfried, which cluster in a relatively small area along the Danube river in Lower Austria. LPS provide detailed insights into climate-driven, terrestrial palaeoenvironmental changes that can be placed into a robust chronological framework, because LPS are amenable to a range of dating techniques. Here, we present a well-dated 13.6 m-thick mammoth-bearing sediment succession characterised by low-energy aquatic deposits, sheet-flow deposits and sandy loess from re-deposited Miocene sediments, i.e. a depositional environment that contrasts to the classical LPS sites. This new site is situated 1.6 km NNE of Bullendorf in Lower Austria, where Pleistocene sediment successions with a robust chronology are rare. Our multidisciplinary approach is based on optically stimulated luminescence and 14C dating, and includes mammal faunal investigations and stable isotope analyses of molluscs. OSL and 14C dating suggest deposition of the sediment sequence immediately before and briefly after the Last Glacial Maximum. The mollusc assemblages and the mammal fauna are representative of a cold climate, characteristic of a tundra steppe environment. Stratigraphic changes in δ18O of two mollusc species (Pupilla muscorum and Succinella oblonga) suggest an alternating dry-cold and humid-cold climate. Oxygen isotope data of freshwater gastropod shells suggest a drastic decrease in the mean growing season temperature compared to today, while the carbon isotope composition is indicative of a C3 vegetation. AU - Carobene, Daria AU - Meyer, Michael C. AU - Spötl, Christoph AU - Rötzel, Reinhard AU - Göhlich, Ursula B. AU - Mandic, Oleg AU - Harzhauser, Mathias AU - Wimmer-Frey, Ingeborg AU - Reimer, Paula J. AU - Auer, Fabian DA - 2020/03/20/ DO - 10.1016/j.quaint.2020.02.022 KW - Late pleistocene Palaeoenvironment Luminescence dating Stable isotopes Austria PY - 2020 RN - loess SN - 1040-6182 SP - 15-29 JO - Quaternary International TI - An interdisciplinary study of a mammoth-bearing Late Pleistocene sediment succession in lower Austria UR - http://www.sciencedirect.com/science/article/pii/S1040618220300641 VL - 542 ID - 110 ER - TY - JOUR AB - Constraining time is of critical importance to evaluating the rates and relative contributions of processes driving landscape change in sedimentary basins. The geomorphic character of the field setting guides the application of geochronologic or instrumental tools to this problem, because the viability of methods can be highly influenced by geomorphic attributes. For example, sediment yield and the linked potential for organic preservation may govern the usefulness of radiocarbon dating. Similarly, the rate of sediment transport from source to sink may determine the maturity and/or light exposure of mineral grains arriving in the delta and thus the feasibility of luminescence dating. Here, we explore the viability and quirks of dating and instrumental methods that have been applied in the Bengal Basin, and review the records that they have yielded. This immense, dynamic, and spatially variable system hosts the world's most inhabited delta. Outlining a framework for successful chronologic applications is thus of value to managing water and sediment resources for humans, here and in other populated deltas worldwide. Our review covers radiocarbon dating, luminescence dating, archaeological records and historical maps, short-lived radioisotopes, horizon markers and rod surface elevation tables, geodetic observations, and surface instrumentation. Combined, these tools can be used to reconstruct the history of the Bengal Basin from Late Pleistocene to present day. The growing variety and scope of Bengal Basin geochronology and instrumentation opens doors for research integrating basin processes across spatial and temporal scales. AU - Chamberlain, Elizabeth L. AU - Goodbred, Steven L. AU - Hale, Richard AU - Steckler, Michael S. AU - Wallinga, Jakob AU - Wilson, Carol DA - 2020/01/01 DO - 10.1002/esp.4687 KW - Ganges–Brahmaputra Delta geochronology river channel avulsion relative sea-level rise and subsidence sedimentary basin evolution IS - 1 PY - 2020 RN - review SN - 0197-9337 SP - 56-74 JO - Earth Surface Processes and Landforms TI - Integrating geochronologic and instrumental approaches across the Bengal Basin UR - https://doi.org/10.1002/esp.4687 VL - 45 Y2 - 2020/01/28 ID - 21 ER - TY - JOUR AB - Recent geochronology of the Mississippi Delta of coastal Louisiana, USA, provides a high-resolution record of land growth that facilitates the study of ancient settlement patterns in relation to delta evolution. We use stratigraphy and optically stimulated luminescence (OSL) dating to show that two Late Holocene earthen mounds were constructed several hundred years after the land emerged from open water. This multi-century pause allowed natural processes of overbank and crevasse splay deposition to elevate the land surface, reduce flood risk, and foster desirable environmental conditions prior to human occupation. These results are applied to obtain new age constraints for a large number of at-risk or lost archaeological sites with little-to-no absolute chronology. We use our findings to comment on prehistoric, contemporary, and future human-landscape interactions in the Mississippi Delta and other deltaic environments. AU - Chamberlain, Elizabeth L. AU - Mehta, Jayur M. AU - Reimann, Tony AU - Wallinga, Jakob DA - 2020/07/01/ DO - 10.1016/j.geomorph.2020.107132 KW - Coupled human-natural systems Mississippi Delta Optically stimulated luminescence dating Sustainability PY - 2020 RN - coastal archaeology SN - 0169-555X SP - 107132 JO - Geomorphology TI - A geoarchaeological perspective on the challenges and trajectories of Mississippi Delta communities UR - http://www.sciencedirect.com/science/article/pii/S0169555X20301045 VL - 360 ID - 109 ER - TY - JOUR AB - Previously published geochemical and mineralogical data have revealed conflicting views on the provenance of the deep-sea sediments in the Bengal Fan. Here we report results of a study for a 330-m sequence consisting of both turbitide and semi-pelagic sediments recovered at the Site U1444A during the IODP 353 Expedition. A novel technique using the optically and thermally stimulated luminescence (OSL and TL) signatures from quartz and K-feldspar has been employed to characterise the mineral compositions of the sediments. We show that the quartz luminescence sensitivity clearly differentiates the four sedimentary units. There is a distinct increase of quartz luminescence sensitivity in Unit 2 during the time interval of ~3.5–0.5 Ma. Analyses of the luminescence signal components in quartz and the ratio of the K-feldspar and quartz also point to a change in Unit 2 relative to the other three units. We interpret such changes in the mineralogical compositions through the sequence as reflecting a change in the provenance over the last 7 million years in the western Bengal Fan. We attribute the quartz with enhanced luminescence sensitivity in Unit 2 to the contribution from the sources associated with Indian rivers. We infer that the delivery of the sediments from Indian peninsula to IODP Site U1444A is facilitated by a weakening in the turbidite deposition which is dominated by weathering products from the Himalayas. We speculate that the relatively high elevation of the 85°E Ridge may act against the flow through and the associated deposition of turbidity current originated from the Himalayas. AU - Chang, Zihao AU - Zhou, Liping DA - 2019/12/01/ DO - 10.1016/j.jseaes.2019.104008 KW - The Bengal Fan IODP Site U1444A Luminescence characteristics Provenance change PY - 2019 RN - basic research SN - 1367-9120 SP - 104008 JO - Journal of Asian Earth Sciences TI - Evidence for provenance change in deep sea sediments of the Bengal Fan: A 7 million year record from IODP U1444A UR - http://www.sciencedirect.com/science/article/pii/S1367912019303608 VL - 186 ID - 122 ER - TY - JOUR AB - In a previous paper, the issue of the evaluated lifetimes of thermoluminescence (TL) and optically stimulated luminescence (OSL) has been studied for the one-trap-one-recombination-center (OTOR) case, using the Monte-Carlo simulation. It was shown that under these circumstances, the decay curve of the electron occupancy along many thousands of years may not be exponential. Therefore, a lifetime determined from the results at short periods of time may not apply at longer periods of time. The decay at longer times was found to be slower than exponential and thus, one may observe longer lifetimes than predicted by the evaluated trapping parameters. In the present work we demonstrate that with a more complex model, namely, when an additional deeper trap is involved, the probability of getting an exponential decay of the signal is much larger. We study the fading of OSL and TL signals with different times elapsing between excitation and read-out under these circumstances, using a Monte-Carlo procedure, and show that with a significant deep-trap competitor, the extrapolation leading to the evaluation of the long-term stability of the signal is more viable. The results are compatible with previously existing evidence that the chances of having a TL peak with first-order characteristics are significantly larger in cases where a large deep trap, acting as a competitor, is present. AU - Chen, R. AU - Pagonis, V. DA - 2020/03/01/ DO - 10.1016/j.radmeas.2020.106257 KW - Optically stimulated luminescence Thermoluminescence Exponential and non-exponential decay Monte-Carlo method Fading PY - 2020 RN - basic research SN - 1350-4487 SP - 106257 JO - Radiation Measurements TI - A Monte-Carlo study of the fading of TL and OSL signals in the presence of deep-level competitors UR - http://www.sciencedirect.com/science/article/pii/S1350448720300214 VL - 132 ID - 75 ER - TY - JOUR AB - Delta deposits show large spatial heterogeneity in terms of depositional rate and age, which is critical to the study of delta erosion in response to the declining fluvial sediment load observed at many river mouths in the world. In this study, we show that the magnetic susceptibility (χ) can be an indicator to reveal age variations and stratigraphic heterogeneity in the Yangtze River subaqueous delta. Ages of three short sediment cores (<2 m) collected at 20–32 m water depth from the Yangtze River subaqueous delta were determined using 210Pb, 137Cs, and optically stimulated luminescence (OSL) dating. In addition, depth variation of χ, which is influenced by post-depositional diagenesis and hence age, was used to roughly infer sediment ages among the cores in a simple way. The profiles of 210Pb, 137Cs, and OSL dating results indicate the spatial variability of ages, ranging from the last 100 years to >1700 years. The cores at shallow water depths are younger than those from deeper sites. Modern deposits (i.e., <100 years old) occur primarily at water depths shallower than ca. 30 m. The core in the northern part of the subaqueous delta shows much older ages than the core at the southern site with similar water depth, which is caused by their longer distance relative to the mouth of active sediment discharge distributary. Profile of χ confirms such spatial variation of ages in terms of depth distribution pattern and χ value. Older sediments (>800 a) show lower and uniform χ values due to the reductive dissolution of ferrimagnetic minerals, while younger sediments (<350 a) show higher χ values in the top layer but they decline with increasing depth. Considering the quick way of magnetic measurement, stratigraphic correlation based on χ can be used first to screen for cores before they are subjected to more detailed dating. This study shows that the methodological approach of combining sediment dating with magnetic measurement has great potential in revealing heterogeneous deltaic deposits. AU - Cheng, Qinzi AU - Wang, Feng AU - Chen, Jin AU - Ge, Can AU - Chen, Yinglu AU - Zhao, Xuanqi AU - Nian, Xiaomei AU - Zhang, Weiguo AU - Liu, Kam-biu AU - Xu, Yijun AU - Lam, Nina DA - 2020/06/15/ DO - 10.1016/j.geomorph.2020.107163 KW - Stratigraphic heterogeneity Magnetic susceptibility Optically stimulated luminescence (OSL) dating Radionuclide dating (Pb, Cs) Yangtze River subaqueous delta PY - 2020 RN - coastal SN - 0169-555X SP - 107163 JO - Geomorphology TI - Combined chronological and mineral magnetic approaches to reveal age variations and stratigraphic heterogeneity in the Yangtze River subaqueous delta UR - http://www.sciencedirect.com/science/article/pii/S0169555X20301355 VL - 359 ID - 98 ER - TY - JOUR AB - Phototransferred thermoluminescence (PTTL) induced from annealed synthetic quartz using 470 nm blue light is reported. The quartz was annealed at 900 °C for 10, 30 and 60 min prior to use. A glow curve of conventional TL measured at 1 °C s−1 following irradiation to 200 Gy for the sample annealed for 10 min shows six peaks at 90, 122, 176, 210, 240 and 340 °C. The sample annealed for 30 min has peaks at 80, 110, 136, 196, 240 and 330 °C. Similarly, the sample annealed for 60 min also has six peaks at 80, 120, 134, 188, 235 and 340 °C. For ease of reference, these are labelled I-VI respectively. Peaks observed under PTTL are referred to as A1 onwards. Of the six peaks, only the first three are reproduced under phototransfer for the sample annealed for 60 min. When the duration of annealing is reduced to 10 min, PTTL is induced only at peaks A1 and A3. Interestingly, for the intermediate duration of annealing of 30 min, the only peak that appears under phototransfer is the first one, A1. For quartz annealed for 10 min, the PTTL appears as long as the preheating temperature does not exceed 560 °C. On the other hand, in the quartz annealed for 30 and 60 min, PTTL only appears for preheating to and below 450 °C. This shows that the occupancy of deep electron traps at temperatures beyond 450 or 560 °C is low in the said samples. The activation energy for peaks A1 and A3 was found to be about 0.68 eV. The PTTL peaks were studied for thermal quenching and peaks A1 and A3 were determined to be subject to this effect. The activation energy for thermal quenching was determined as 0.62±0.04 eV in analysis using peak A1. In all cases, the PTTL intensity goes through a peak as a function of illumination time. The experimental dependence of PTTL intensity on illumination time is modelled using sets of coupled linear differential equations based on systems of donors and acceptors whose number is determined by preheating temperature. Competition effects involved in the PTTL have been discussed. AU - Chithambo, M. L. AU - Dawam, R. R. DA - 2020/02/01/ DO - 10.1016/j.radmeas.2019.106236 KW - Annealing Phototransferred thermoluminescence Thermal quenching Competition effects Synthetic quartz PY - 2020 RN - basic research SN - 1350-4487 SP - 106236 JO - Radiation Measurements TI - Phototransferred thermoluminescence of annealed synthetic quartz: Analysis of illumination-time profiles, kinetics and competition effects UR - http://www.sciencedirect.com/science/article/pii/S1350448719305220 VL - 131 ID - 46 ER - TY - JOUR AB - Radioluminescence spectra of Al2O3:C,Mg monitored at temperatures up to 400 °C is reported. Measurements were made on samples either as received or on ones annealed at 1200 °C. Radioluminescence is observed at 410 nm for the unannealed sample but principally at 330 and 410 nm in the annealed sample with the emission at 330 nm dominant. Both bands are subject to thermal quenching but the change for the F+ band is atypical. Temperature induced effects on these and other bands are discussed, as are complementary measurements of thermoluminescence spectra. AU - Chithambo, M. L. AU - Kalita, J. M. AU - Finch, A. A. DA - 2020/06/01/ DO - 10.1016/j.radmeas.2020.106306 KW - Radioluminescence Thermoluminescence AlO:C,Mg Annealing Spectra PY - 2020 RN - basic research SN - 1350-4487 SP - 106306 JO - Radiation Measurements TI - F- and F+-band radioluminescence and the influence of annealing on its emission spectra in Al2O3:C,Mg UR - http://www.sciencedirect.com/science/article/pii/S1350448720300706 VL - 134 ID - 133 ER - TY - JOUR AB - India is located at a critical geographic crossroads for understanding the dispersal of Homo sapiens out of Africa and into Asia and Oceania. Here we report evidence for long-term human occupation, spanning the last ~80 thousand years, at the site of Dhaba in the Middle Son River Valley of Central India. An unchanging stone tool industry is found at Dhaba spanning the Toba eruption of ~74 ka (i.e., the Youngest Toba Tuff, YTT) bracketed between ages of 79.6 ± 3.2 and 65.2 ± 3.1 ka, with the introduction of microlithic technology ~48 ka. The lithic industry from Dhaba strongly resembles stone tool assemblages from the African Middle Stone Age (MSA) and Arabia, and the earliest artefacts from Australia, suggesting that it is likely the product of Homo sapiens as they dispersed eastward out of Africa. AU - Clarkson, Chris AU - Harris, Clair AU - Li, Bo AU - Neudorf, Christina M. AU - Roberts, Richard G. AU - Lane, Christine AU - Norman, Kasih AU - Pal, Jagannath AU - Jones, Sacha AU - Shipton, Ceri AU - Koshy, Jinu AU - Gupta, M. C. AU - Mishra, D. P. AU - Dubey, A. K. AU - Boivin, Nicole AU - Petraglia, Michael DA - 2020/02/25 DO - 10.1038/s41467-020-14668-4 IS - 1 PY - 2020 RN - archaeology SN - 2041-1723 SP - 961 JO - Nature Communications TI - Human occupation of northern India spans the Toba super-eruption ~74,000 years ago UR - https://doi.org/10.1038/s41467-020-14668-4 VL - 11 ID - 40 ER - TY - JOUR AB - The Corsica-Sardinia block is a lithospheric fragment whose recent role in the geodynamics of the central-Western Mediterranean basin is still enigmatic. The most recent regional structure in Sardinia is the Plio-Pleistocene Campidano Basin, which is considered in a ?post-rift? stage since the Middle Pleistocene. New structural and stratigraphic geological surveys along with luminescence ages provide evidence to support an ongoing tectonic activity since the Marine Isotopic Stage 7 (MIS7; ca. 220 ka) on the Sinis peninsula, the structural high that bounds the north-western side of the Campidano Basin. In particular, this paper reveals for the first time the presence of N?S striking normal faults system offsetting late Pleistocene aeolianites (130 ± 12 ka; 82 ± 9 ka). AU - Cocco, Fabrizio AU - Andreucci, Stefano AU - Sechi, Daniele AU - Cossu, Giulia AU - Funedda, Antonio DO - 10.1111/ter.12418 IS - 5 PY - 2019 RN - earthquake (and fault related) SN - 0954-4879 SP - 485-493 JO - Terra Nova TI - Upper Pleistocene tectonics in western Sardinia (Italy): Insights from the Sinis peninsula structural high UR - https://doi.org/10.1111/ter.12418 VL - 31 ID - 164 ER - TY - JOUR AB - In western Iberia, mechanisms that can explain the transition from endorheic to exorheic continental-scale drainage reorganization are foreland basin overspill, headwards erosion and capture by an Atlantic river, or a combination of both. To explore these, we have investigated the Portuguese sector of the Douro River, the locus of drainage reorganization. The Douro River is routed downstream through the weak sedimentary infill of the Douro Cenozoic Basin, after which the river cuts down through harder granitic and metamorphic rocks crossed by active fault zones, before reaching the Atlantic coast. We investigated the drainage reorganization using an integrated approach that combined remote sensing, field survey and geochronology, applied to Pliocene–Quaternary fluvial sediments and landforms. The older drainage record is documented by a series of high and intermediate landform levels comprising: (1) a high level (1000–500 m a.s.l.) faulted regional fluvial erosion surface, the North Iberian Meseta planation surface and the Mountains and Plateaus of Northern Portugal, recording the endorheic drainage of the Douro Cenozoic Basin; (2) a first inset level at 650–600 m a.s.l., comprising a broad fluvial surface developed onto a large ENE–WSW depression, interpreted as recording the initiation of the continental scale reorganization; and (3) an inset fluvial surface at 550–400 m a.s.l., corresponding to the establishment of the exorheic ancestral Douro valley. The younger drainage record comprises an entrenched fluvial strath terrace sequence of up to 9 levels (T9 = oldest), positioned at 246–242 m above the modern river base; T1 = youngest, positioned at +17–13 m. Levels T1 and T3 display localized fault offsets. The three lowest terrace levels (T3–T1) were dated using optically stimulated luminescence techniques with results ranging from >230–360 ka (T3), through 57 ka (T2) to 39–12 ka (T1). Fluvial incision rates of the younger terraces were quantified and temporally extrapolated to model the ages of the intermediate to high elevation levels of the early drainage record. Integration of incision data informs on the probable timing of the drainage reorganization and the initial adjustment, ~3.7–1.8 Ma. This was followed by acceleration of incision, producing the entrenched river terrace sequence developed via spatial and temporal variations in rock strength, uplift and cyclic cool-climate variability as the river adjusted to the Atlantic base level. AU - Cunha, Pedro P. AU - Martins, António A. AU - Gomes, Alberto AU - Stokes, Martin AU - Cabral, João AU - Lopes, Fernando C. AU - Pereira, Diamantino AU - de Vicente, Gerardo AU - Buylaert, Jan-Pieter AU - Murray, Andrew S. AU - Antón, Loreto DA - 2019/10/01/ DO - 10.1016/j.gloplacha.2019.102985 KW - Western Iberia Transverse drainage Basin overspill Incision rate Terrace staircase Luminescence dating PY - 2019 RN - fluvial SN - 0921-8181 SP - 102985 JO - Global and Planetary Change TI - Mechanisms and age estimates of continental-scale endorheic to exorheic drainage transition: Douro River, Western Iberia UR - http://www.sciencedirect.com/science/article/pii/S0921818119300232 VL - 181 ID - 125 ER - TY - JOUR AB - Paleobeach ridges in and around the Digha coast, West Bengal, India give significant information about the sea regression in eastern Indian coast during Holocene. Beach ridges paralleling the Bay of Bengal coast in West Bengal and a few remnants beach ridges further landward in Kanthi (West Bengal) and Jaleswarpur (Odisha), give a tentative boundary of the north eastern most palaeo-shoreline. From optically stimulated luminescence (OSL) dates of the Paleobeach ridges, it is suggested that around 500 YBP, the sea was near Kanthi and around 378 YBP the sea was near Jaleswarpur (35 km inland). After that, the sea sequentially regressed in phases towards south and attained the present position at Digha. The Photogeology & Remote Sensing (PGRS) Study of different satellite imageries (2006 onwards) along with the Survey of India Toposheets (1930, 1972) of Digha area indicates that the coast line to be steadily regressed in the east of Digha, whereas, it shows fluctuation in the west of it. This fluctuation of strand line position may be due to the differential sediment influx through the Subarnarekha river mouth with time. Regional neotectonic activities also play a role in shaping the coast. The concave orientation of the beach ridge plains to the present shoreline reflects the supply of sediments in the direction of palaeolongshore currents. The shape of the inner beaches shows that the deposition prograded north-west wards. Major type of cross-beddings present in the Paleobeach ridges represented by low angle laminated sand, indicates the wide seaward dipping part of longshore bars. The grain size analysis of the sediment samples of the beach ridges indicate positively skewed and mesokurtic. The mean size of resultant sediments is finer, indicating that the energy level or turbulence of the eroding processes was incapable of transporting sediments coarser than the mean size of the source sediments. AU - Dalabehera, Linashree AU - Hazra, Antara AU - Pattanayak, Sagarika AU - Pal, Tapan DA - 2020/02/01 DO - 10.1007/s12594-020-1402-7 IS - 2 PY - 2020 RN - coastal SN - 0974-6889 SP - 131-144 JO - Journal of the Geological Society of India TI - The paleobeach ridges of Digha coastal tract, West Bengal, India: Observation and implication for sea regression from 500 YBP to 200 YBP UR - https://doi.org/10.1007/s12594-020-1402-7 VL - 95 ID - 32 ER - TY - JOUR AB - To date, in Africa, evidence for animal processing and consumption in caves routinely used as living spaces is only documented in the late Middle Pleistocene of the North and South of the continent and postdates the Middle Pleistocene in East Africa. Here we report the earliest evidence in a North-African cave (Grotte des Rhinocéros at Casablanca, Morocco) of cut, percussion and human gnawing marks on faunal remains directly associated with lithic knapping activities in the same space and in a well-documented stratified context. Ages for this Acheulean site are provided by the dating of herbivorous teeth to 690–720 ka and 520–550 ka (lower and upper sets) by combined Electron Spin Resonance (ESR) and U-series techniques. Traces of butchery on gazelle, alcelaphin, and zebra bones demonstrate that hominins had primary access to herbivore carcasses. Hominins brought and consumed meat in the cave, as documented by herbivore bones bearing human tooth marks concentrated in a circumscribed area of the excavation. In Africa, this site provides the earliest evidence for in situ carcass processing and meat-eating in cave, directly associated with lithic production and demonstrates the recurrent use by early Middle Pleistocene hominins of a North African cave site 400 000 years before that by Homo sapiens at Jebel Irhoud (Morocco). AU - Daujeard, Camille AU - Falguères, Christophe AU - Shao, Qingfeng AU - Geraads, Denis AU - Hublin, Jean-Jacques AU - Lefèvre, David AU - Graoui, Mohssine El AU - Rué, Mathieu AU - Gallotti, Rosalia AU - Delvigne, Vincent AU - Queffelec, Alain AU - Arous, Eslem Ben AU - Tombret, Olivier AU - Mohib, Abderrahim AU - Raynal, Jean-Paul DA - 2020/03/16 DO - 10.1038/s41598-020-61580-4 IS - 1 PY - 2020 RN - archaeology ESR SN - 2045-2322 SP - 4761 JO - Scientific Reports TI - Earliest African evidence of carcass processing and consumption in cave at 700 ka, Casablanca, Morocco UR - https://doi.org/10.1038/s41598-020-61580-4 VL - 10 ID - 54 ER - TY - JOUR AB - Time-dependent changes in dose rates generally need to be considered in luminescence dating due to the dynamic character of the geosphere. Nevertheless, this aspect is rather marginally treated in the literature. The present paper describes the methodology of including temporal variations of overburden, moisture content and radionuclide activity into the calculation of dating results. Consideration of possible occurrences of variable dose rates has consequences for fieldwork procedures as well as for the choice of appropriate methods of radionuclide determination. A program code for age calculation by luminescence methods called ADELE v2017 is presented which implements several examples of temporal dose rate variations and layered structures with inhomogeneous distribution of dose rate relevant elements. The impact of variable dose rates on age data is illustrated by applying ADELE v2017 to several case studies. AU - Degering, Detlev AU - Degering, Albrecht DA - 2020/06/01/ DO - 10.1016/j.quageo.2020.101074 KW - Time-dependent dose rate Luminescence dating Radioactive disequilibria Age calculation Software PY - 2020 RN - dose rate computer coding SN - 1871-1014 SP - 101074 JO - Quaternary Geochronology TI - Change is the only constant - time-dependent dose rates in luminescence dating UR - http://www.sciencedirect.com/science/article/pii/S1871101420300236 VL - 58 ID - 147 ER - TY - JOUR AB - Colluvial and aeolian successions in coastal environments are useful indicators of geomorphological changes that occurred during the Quaternary. Pleistocene aeolian deposits interbedded with colluvial deposits and palaeosols in areas of Cap Negret, Punta de sa Pedrera, Cala Bassa and Cala Compte, western coast of the island of Eivissa (western Mediterranean) are studied here. These deposits span almost continuously along 14 km of the coast, covering an area of approximately 22 km2. We present a sedimentological and stratigraphical description of these Pleistocene outcrops. Five major sedimentary facies involving the succession of aeolian, colluvial and edaphic environments are described. Carbonate sandstones, breccias, conglomerates and fine-grained deposits are the main components of these sequences. Optically stimulated luminescence (OSL) dating of aeolian levels indicates that deposition took place from the Lower to Middle Pleistocene. The sedimentological and chronological analysis of these deposits allows reconstructing of the coastal Pleistocene environmental history from Marine Isotopic Stage (MIS) 22 to MIS 6. Results show that the main controls on Lower to Middle Pleistocene coastal landscape evolution on Western Eivissa are changes in the average wind direction over time, modulated by the interaction with coastal relief orientation. The main episodes of aeolian activity identified and dune formation in the Western Mediterranean can be linked to periods of low sea level. AU - Del Valle, Laura AU - Pomar, Francesc AU - Fornós, Joan J. AU - Gómez-Pujol, Lluís AU - Timar-Gabor, Alida DA - 2020/08/01/ DO - 10.1016/j.aeolia.2020.100595 KW - Aeolianites Coastal dunes Lowstands OSL dating Pleistocene Eivissa PY - 2020 RN - aeolian SN - 1875-9637 SP - 100595 JO - Aeolian Research TI - Lower to middle pleistocene coastal dune fields formation in the western mediterranean (Western Eivissa, Balearic archipelago): Chronology and landscape evolution UR - http://www.sciencedirect.com/science/article/pii/S187596372030046X VL - 45 ID - 91 ER - TY - JOUR AB - Analyses on TL glow curves recorded with various heating rates for some ternary and quaternary crystals were accomplished using peak maximum temperatures (Tmax) which are experimentally obtained and corrected according to temperature lag effect proposed by Kitis and Tuyn. Curve fitting, initial rise, peak shape and variable heating rate methods were applied to experimental and corrected TL peaks. In spite of the fact that heating rate does not affect activation energy of a TL peak, analyses performed on the experimentally obtained TL curves resulted in an increment of the activation energy with increasing heating rate. However, as the corrected TL data were used for the analyses, the activation energy values of each TL peak recorded with different heating rate were in good agreement with each other. The detailed analyses on studied samples were given in the present paper. AU - Delice, Serdar DA - 2018/12/01/ DO - 10.1016/j.jlumin.2018.07.044 KW - Thermoluminescence Various heating rates Temperature lag effect PY - 2018 RN - basic research SN - 0022-2313 SP - 81-88 JO - Journal of Luminescence TI - Temperature lag effect on TL glow peaks: Corrections on kinetic parameters UR - http://www.sciencedirect.com/science/article/pii/S0022231318306148 VL - 204 ID - 102 ER - TY - JOUR AB - The Atacama Desert in northern Chile is one of the driest deserts on Earth. Hyperaridity persists at least since the Miocene and was punctuated by pluvial phases. However, very little is known about the timing, regional spread and intensities of precipitation changes. Here, we present a new precipitation record from a sedimentary sequence recovered in a tectonically blocked endorheic basin that is located in the hyperarid core of the Atacama Desert. The chronostratigraphic framework of the record is given by a multi-disciplinary dating approach, suggesting an age of ca. 68 ka BP for the core base. The sequence consists of three sediment types, whose sedimentological and geochemical characteristics suggest different depositional processes that reflect different degrees in humidity. First, particularly fine-grained sediments with high clastic but low calcium sulfate and carbonate contents reflect a particularly dry climate with only sporadic precipitation events and fluvial supply via channel systems. Second, more coarse-grained sediments with lower clastic and higher calcium sulfate and carbonate contents reflect more moist conditions with stronger precipitation events that lead to fluvial activity not restricted to the channels but involving the slopes and plains in the catchment. Third, normally graded layers with an equally high proportion of calcium sulfate and carbonate reflect occasional high-precipitation events that caused sediment supply also from most distant parts of the catchment via severe flash floods. The sedimentary succession suggests that precipitation changes took place on orbital but also on millennial time scales. Rather moist periods occurred during most of MIS 2, several shorter periods within MIS 3 and parts of MIS 4. Comparison of the findings from the Huara record with selected climate records from continental and marine sites in South America suggests a strong precipitation heterogeneity across the Atacama. This heterogeneity is caused by pronounced differences in the dominating climate patterns and a shift from predominant summer rain in the north to winter rain in the south. Precipitation supply to the Huara clay plan is controlled by the atmospheric circulation rather than the surface temperature of the adjacent ocean. AU - Diederich, Julia L. AU - Wennrich, Volker AU - Bao, Roberto AU - Büttner, Christoph AU - Bolten, Andreas AU - Brill, Dominik AU - Buske, Stefan AU - Campos, Eduardo AU - Fernández-Galego, Emma AU - Gödickmeier, Peggy AU - Ninnemann, Lukas AU - Reyers, Mark AU - Ritter, Benedikt AU - Ritterbach, Laura AU - Rolf, Christian AU - Scheidt, Stephanie AU - Dunai, Tibor J. AU - Melles, Martin DA - 2020/01/01/ DO - 10.1016/j.gloplacha.2019.103054 KW - Atacama Hyperaridity Endorheic basin Paleoclimate Precipitation history PY - 2020 RN - lacustrine SN - 0921-8181 SP - 103054 JO - Global and Planetary Change TI - A 68 ka precipitation record from the hyperarid core of the Atacama Desert in northern Chile UR - http://www.sciencedirect.com/science/article/pii/S0921818119305399 VL - 184 ID - 156 ER - TY - JOUR AB - This study examines the southeastern end of the Younghusband Peninsula in South Australia at a location called The Granites in order to gain a better understanding of the processes of formation of the foredune ridge system, and to investigate the drivers that controlled its progradational development during the Holocene. Our findings are based on a morphological analysis, a ground penetrating radar survey, and 14C and OSL dating. The Younghusband Peninsula at The Granites was formed by an initial aggradational phase resulting in a single complex foredune ridge, and which ended around 4.3 ka, and by a regressive (progradational) barrier phase (750 m wide) that developed in the last 4.3 ka, under very low rates of progradation (0.38 to 0.09 m/yr). The last part of this phase shows significant foredune ridge building in the last 1000 years or so. Barrier progradation via foredune ridge development is likely an effect driven by low wave energy that favored conditions for coastal stability and foredune formation. Paleontological and GPR data indicate a maximum sea-level of +1.23 to +1.5 m, respectively, during initial barrier development. The foredune ridge plain of the barrier experienced at least three phases of significant aeolian activity with ages centered at around 3.9, 3.4 and 3.0 ka suggesting their occurrence at 500 to 400-year events. Computer modelling indicates that sediments for the progradational phase of the barrier were provided by the forced regression produced by a sea-level fall over the past 4.3 ka. The large foredune complex formed during the last phase of progradation could be the result of both the very low progradation rate of 0.09 m/yr, and periods of disturbance possibly related to enhanced storm activity. AU - Dillenburg, Sergio R. AU - Hesp, Patrick A. AU - Keane, Robert AU - da Silva, Graziela Miot AU - Sawakuchi, André O. AU - Moffat, Ian AU - Barboza, Eduardo G. AU - Bitencourt, Volney J. B. DA - 2020/04/01/ DO - 10.1016/j.geomorph.2020.107044 KW - Foredune ridges Barrier progradation The Granites OSL dating PY - 2020 RN - coastal SN - 0169-555X SP - 107044 JO - Geomorphology TI - Geochronology and evolution of a complex barrier, Younghusband Peninsula, South Australia UR - http://www.sciencedirect.com/science/article/pii/S0169555X20300143 VL - 354 ID - 65 ER - TY - JOUR AB - New ages for flowstone, sediments and fossil bones from the Dinaledi Chamber are presented. We combined optically stimulated luminescence dating of sediments with U-Th and palaeomagnetic analyses of flowstones to establish that all sediments containing Homo naledi fossils can be allocated to a single stratigraphic entity (sub-unit 3b), interpreted to be deposited between 236 ka and 414 ka. This result has been confirmed independently by dating three H. naledi teeth with combined U-series and electron spin resonance (US-ESR) dating. Two dating scenarios for the fossils were tested by varying the assumed levels of 222Rn loss in the encasing sediments: a maximum age scenario provides an average age for the two least altered fossil teeth of 253 +82/–70 ka, whilst a minimum age scenario yields an average age of 200 +70/–61 ka. We consider the maximum age scenario to more closely reflect conditions in the cave, and therefore, the true age of the fossils. By combining the US-ESR maximum age estimate obtained from the teeth, with the U-Th age for the oldest flowstone overlying Homo naledi fossils, we have constrained the depositional age of Homo naledi to a period between 236 ka and 335 ka. These age results demonstrate that a morphologically primitive hominin, Homo naledi, survived into the later parts of the Pleistocene in Africa, and indicate a much younger age for the Homo naledi fossils than have previously been hypothesized based on their morphology. AU - Dirks, Paul H. G. M. AU - Roberts, Eric M. AU - Hilbert-Wolf, Hannah AU - Kramers, Jan D. AU - Hawks, John AU - Dosseto, Anthony AU - Duval, Mathieu AU - Elliott, Marina AU - Evans, Mary AU - Grün, Rainer AU - Hellstrom, John AU - Herries, Andy I. R. AU - Joannes-Boyau, Renaud AU - Makhubela, Tebogo V. AU - Placzek, Christa J. AU - Robbins, Jessie AU - Spandler, Carl AU - Wiersma, Jelle AU - Woodhead, Jon AU - Berger, Lee R. C1 - eLife 2017;6:e24231 DA - 2017/05/09 DO - 10.7554/eLife.24231 KW - Homo naledi hominin Dinaledi Chamber dating paleoanthropology Pleistocene PY - 2017 RN - archaeology ESR SN - 2050-084X SP - e24231 JO - eLife TI - The age of Homo naledi and associated sediments in the Rising Star Cave, South Africa UR - https://doi.org/10.7554/eLife.24231 VL - 6 ID - 20 ER - TY - JOUR AB - Phototransferred thermoluminescence (PTTL) of mobile phone display glass (category A) is systematically investigated to develop a robust measurement protocol for its emergency dosimeter usage after an incident with ionizing radiation. First, optimal readout parameters were defined by varying preheat temperature and holding time preceding violet exposure (405 nm). Next, the detection window of the PTTL measurement was adjusted to optimize the ratio between radiation-induced (RIS) and non-radiation-induced signals (nRIS) of the PTTL. Finally, the developed protocol determines PTTL after preheating to 400 °C and holding for 10 s was tested using the detection window centered at 340 nm. Dosimetric properties such as the PTTL reproducibility and dose response were investigated. PTTL signal stability tests showed that the violet PTTL signal originates from deeper and consequently more thermally stable traps. A signal loss of less than 10% after 10.6 days (254 h) storage was observed. Additionally, TL and PTTL spectra were recorded to investigate the luminescence emissions after beta and gamma irradiation and different UV exposures. PTTL emissions are similar to TL emission. Varying UV energy a qualitative comparison demonstrate that the RIS and nRIS PTTL signal intensities increase significantly with decreasing UV stimulation wavelength. In general, the developed PTTL protocol indicates better signal stability and thus some advantages over other techniques, however, further research is needed to test the potential of a new method for physical retrospective dosimetry. AU - Discher, Michael AU - Woda, Clemens AU - Lee, Jungil AU - Kim, Hyoungtaek AU - Chung, Kisoo AU - Lang, Andreas DA - 2020/03/01/ DO - 10.1016/j.radmeas.2020.106261 KW - PTTL Phototransferred thermoluminescence PTTL of display glass Dosimetric properties PTTL emission spectra Physical retrospective dosimetry PY - 2020 RN - dosimetry SN - 1350-4487 SP - 106261 JO - Radiation Measurements TI - PTTL characteristics of glass samples from mobile phones UR - http://www.sciencedirect.com/science/article/pii/S1350448720300251 VL - 132 ID - 76 ER - TY - JOUR AB - Electronic level schemes with the host valence and conduction band together with the level locations of ground and excited states of defects are used to explain and predict luminescence and carrier trapping phenomena. These schemes are always constructed and interpreted by using the electron picture. In this work the alternative hole picture is presented. Such picture is sometimes used in the field of semi-conductors but hardly ever in the field of wide band gap inorganic compounds. We will focus on the lanthanides, and first show where to draw the hole ground state and excited hole states in our scheme. It leads to up-side-down Dieke diagrams and up-side-down configuration coordinate diagrams but for the rest everything is equivalent to the electron picture. With the hole picture, luminescence quenching via hole ionization to the valence band and hole trapping in defects can be illustrated much more conveniently than with the electron picture. As examples the quenching of the Tb3+ D45 emissions by electron ionization and the quenching of the Eu3+ D05 emissions by hole ionization are compared. AU - Dorenbos, Pieter DA - 2018/05/01/ DO - 10.1016/j.jlumin.2018.01.013 PY - 2018 RN - basic research SN - 0022-2313 SP - 62-65 JO - Journal of Luminescence TI - The hole picture as alternative for the common electron picture to describe hole trapping and luminescence quenching UR - http://www.sciencedirect.com/science/article/pii/S0022231317321191 VL - 197 ID - 101 ER - TY - JOUR AB - The grain transfer protocol presents a step-by-step guide on how to successfully transfer positioned grains from a single-grain luminescence disc to a scanning electron microscope (SEM) specimen stub and how to transport them between laboratories. Single-grain luminescence analysis allows the determination of luminescence characteristics for individual sand-sized grains. By combining such luminescence data with other grain properties such as geochemical composition, shape, or structure also at single-grain level, it is possible to investigate factors controlling luminescence signals or study other material properties. The non-luminescence properties are typically measured in another instrument; thus, grains need to be transferred between machines and sample holders, and sometimes also between laboratories. It is then important that the position of each grain is known and stable so that the properties from the same grain are compared. By providing an easily observable orientation marker on the specimen stub, the hundred numbered grains from the single-grain disc can be transferred and later identified when analyzed in the SEM. AN - 10.3390/mps2040087 AU - Doverbratt, Isa AU - Alexanderson, Helena IS - 4 PY - 2019 RN - review SN - 2409-9279 SP - 87 JO - Methods and Protocols TI - Transferring grains from single-grain luminescence discs to SEM specimen stubs UR - https://www.mdpi.com/2409-9279/2/4/87 VL - 2 ID - 11 ER - TY - JOUR AB - Existing infrared photoluminescence (IRPL) systems have used pulsed infrared stimulation (~830 nm) and measured IRPL emission (at 880 or 955 nm) using time resolved data collection with photomultipliers. Breakthrough of the infrared stimulation light overwhelms the IRPL, but the delayed emission during the laser-off period has been used instead. This paper describes a system for measurement of the IRPL signal from single sand-sized grains of feldspar. The attachment uses an electron-multiplying charge-coupled device (EMCCD) imaging system, and has two innovations that make it possible to use such a detector to obtain IRPL data. First, the optical detection system has been designed to minimise stray light and maximise the efficiency with which filters reject the stimulation light. This acts to reduce, but not eliminate, the breakthrough. Second, by placing the sample to be measured in a clearly defined sample grid, the spatial resolution provided by the EMCCD has been used to differentiate between regions of the image where IRPL is emitted and adjacent regions where only breakthrough is expected. This allows quantification of the breakthrough and effective subtraction to isolate the IRPL signal from the grains of interest. The attachment has been used to measure IRPL from single sand-sized grains of feldspar from an aeolian dune from New Zealand. A 1W UV LED (365 nm) is also added to the system and this is effective at resetting the IRPL signal, permitting a single aliquot regenerative dose (SAR) protocol to be used to measure equivalent dose (De). Measurement of a known laboratory dose (104 Gy) demonstrates the reproducibility of the attachment, with no overdispersion observed in the resulting single grain De values. The recovered dose is within 10% of the given dose. The natural IRPL signal yields De values from single grains with low overdispersion (22%) and giving a weighted mean value (103 ± 5.8 Gy) that is consistent with that obtained using post-IR IRSL measurements (105 ± 3.8 Gy). The attachment described here provides IRPL measurements on single grains suitable for exploring the potential of this novel and exciting signal for dating geological sediments. AU - Duller, G. A. T. AU - Gunn, M. AU - Roberts, H. M. DA - 2020/04/01/ DO - 10.1016/j.radmeas.2020.106313 KW - Luminescence Imaging EM-CCD Feldspar Dose determination PY - 2020 RN - basic research SN - 1350-4487 SP - 106313 JO - Radiation Measurements TI - Single grain infrared photoluminescence (IRPL) measurements of feldspars for dating UR - http://www.sciencedirect.com/science/article/pii/S1350448720300779 VL - 133 ID - 94 ER - TY - JOUR AB - We used DosiVox to evaluate the impact of cement thickness on the dose effectively absorbed by the enamel layer. Until now, the thickness of the dental tissues adjacent to the enamel layer was not considered by any of the most widely used combined US-ESR dating programs (DATA and USESR). Instead, if adjacent tissues are present, their thickness is by default assumed to be sufficient to fulfill the infinite matrix conditions. Our result suggest that such an assumption may represent in first instance a fair approximation of the reality, as even with a thickness of only 1 mm, the cement contributes to at least 98% of the beta dose rate coming from the outer side of the enamel layer. However, when cement is < 1 mm thick, DATA or USESR would overestimate the external beta dose rate and the value should be corrected accordingly by considering the relative contribution of the sediment. The impact of this correction on the total dose rate may vary, as it is directly dependent on the radioactivity of the cement itself, as well as of the sediment or dentine. Our results show that a very thin cement layer (0.1 mm-thick) can significantly contribute to the beta dose rate and should therefore not be neglected. Consequently, based on these results, we recommend the systematic measurement of the thickness of the dental tissues adjacent to the enamel layer during sample preparation, in order to proceed to beta dose rate corrections if necessary. Although this work has been especially focused on the case of fossil teeth showing cement, the conclusions stand for any other geometry involving different dental tissues adjacent to the enamel layer dated by ESR. AU - Duval, Mathieu AU - Martin, Loїc DO - 10.1515/geochr-2015-0105 LA - English IS - 1 PY - 2019 RN - ESR dose rate SP - 102-110 JO - Geochronometria TI - ESR dating of fossil teeth: In which extent the thickness of adjacent tissues should be taken into account in the external beta dose rate evaluation? UR - https://content.sciendo.com/view/journals/geochr/46/1/article-p102.xml VL - 46 ID - 107 ER - TY - JOUR AB - The Cooloola Sand Mass is a large coastal dune field situated in southeast Queensland, Australia and is part of a much larger system of coastal dune fields, including the world's largest sand Island, Fraser Island, as well as Moreton Island and Stradbroke Island. Cooloola is characterised by a sequence of onlapping, parabolic dune units that have been emplaced episodically over the Pleistocene and Holocene. The tectonically stable coastline of SE Queensland is an ideal area to study the driving mechanisms of coastal dune development, as sea level variability is driven primarily by glacial eustasy. Geomorphic and chronostratigraphic analyses have identified seven major periods of dune activity with the earliest phase of deposition occurring ca. 800 ka. Subsequent periods of dune emplacement date to about ca. 150 ka, 110 ka, 10–6 ka, 5–3.5 ka, ca. 2 ka and 0.4–0.2 ka. The Holocene dune activity coincides with the last stages of post-glacial marine transgression and suggests these large parabolic dunes formed in response to rising sea levels. It is likely that this pattern is consistent through the Pleistocene, and the MIS 5 interglacial period is also recorded. For earlier events the large absolute errors on the ages make interpretation difficult. There is a notable absence of OSL ages dating to the Last Glacial Maximum and no ages that are unambiguously associated with lowstand periods. This is most likely because the coast would have been 60 km offshore of its current position during lowstands, limiting sediment supply and wind energy at the modern coast. These results provide strong evidence that coastal dune fields in SE Australia are predominantly emplaced during sea-level rise, as originally proposed in the Cooper-Thom model. AU - Ellerton, D. AU - Rittenour, T. AU - Shulmeister, J. AU - Gontz, A. AU - Welsh, K. J. AU - Patton, N. DA - 2020/04/01/ DO - 10.1016/j.geomorph.2019.106999 KW - Optically stimulated luminescence Aeolian geomorphology Coastal dune field Marine transgression Cooloola PY - 2020 RN - coastal SN - 0169-555X SP - 106999 JO - Geomorphology TI - An 800 kyr record of dune emplacement in relationship to high sea level forcing, Cooloola Sand Mass, Queensland, Australia UR - http://www.sciencedirect.com/science/article/pii/S0169555X19304908 VL - 354 ID - 63 ER - TY - JOUR AB - Systematic archaeological exploration of southern Qatar started in the 1950s. However, detailed local and regional data on climatic fluctuations and landscape changes during the Holocene, pivotal for understanding and reconstructing human–environment interactions, are still lacking. This contribution provides an overview on the variability of geomorphic environments of southern Qatar with a focus on depression landforms, which reveal a rich archaeological heritage ranging from Palaeolithic(?) and Early Neolithic times to the Modern era. Based on a detailed geomorphic mapping campaign, sediment cores and optically stimulated luminescence data, the dynamics of riyad (singular rawdha; shallow, small-scale, sediment-filled karst depressions clustering in the central southern peninsula) and the larger-scale Asaila depression near the western coast are studied in order to put archaeological discoveries into a wider environmental context. Geomorphic mapping of the Asaila basin shows a much greater geomorphic variability than documented in literature so far with relict signs of surface runoff. An 8 m long sediment core taken in the sabkha-type sand flats of the western basin reveals a continuous dominance of aeolian morphodynamics during the early to mid-Holocene. Mounds preserved by evaporite horizons representing capillarites originally grown in the vadose zone are a clear sign of groundwater-level drop after the sea-level highstand ca. 6000–4500 years ago. Deflation followed the lowering of the Stokes surface, leaving mounds where the relict capillarites were able to fixate and preserve the palaeo-surface. Abundant archaeological evidence of Early and Middle Neolithic occupation – the latter with a clear focus inside the central Asaila basin – indicate more favourable living conditions than today. In contrast, the sediment record of the investigated riyad in the south is very shallow, younger and controlled by surface discharge, deflation and the constantly diminishing barchan dune cover in Qatar over the Middle and Late Holocene. The young age of the infill (ca. 1500 to 2000 years) explains the absence of findings older than the Late Islamic period. Indicators of current net deflation may relate to a decrease in surface runoff and sediment supply only in recent decades to centuries. In the future, geophysical prospection of the riyad may help to locate thicker sedimentary archives and the analysis of grain size distribution, micromorphology, phytoliths or even pollen spectra may enhance our understanding of the interplay of regional environmental changes and cultural history. AU - Engel, M. AU - Rückmann, S. AU - Drechsler, P. AU - Brill, D. AU - Opitz, S. AU - Fassbinder, J. W. AU - Pint, A. AU - Peis, K. AU - Wolf, D. AU - Gerber, C. AU - Pfeiffer, K. AU - Eichmann, R. AU - Brückner, H. DO - 10.5194/egqsj-68-215-2020 IS - 2 PY - 2020 RN - karst SN - 2199-9090 SP - 215-236 JO - Quaternary Science Journal TI - Sediment-filled karst depressions and riyad – key archaeological environments of south Qatar UR - https://egqsj.copernicus.org/articles/68/215/2020/ VL - 68 ID - 180 ER - TY - JOUR AB - This article uses, for the first time, the absolute age for a Qanat system, to determine the slip rate of an earthquake fault. In Iran, many ofQanat galleries were dug in the vicinity of, or directly upon, active faults. In some areas such as Dasht-e Bayaz fault, line of craters are displaced by the activity of the fault, which lead to dry Qanat stream, and consequently to dig new shafts by habitants. By means of measuring the offset between new shafts and old shafts, and considering Qanat antiquity, the estimation of fault slip-rate, which is one of the prominent elements in hazard assessment, becomes possible. This study uses absolute age for a Qanat system, obtained through optically stimulated luminescence dating of grains in spoil heaps of Qanat wells. Feldspar single-grain dating of silt sediments that overlie the construction spoil show that the Miam Qanat was maintained until at least 1.6-2.6 ka. Combination of this age and the 10 meter displacement of Qanat line of shafts byDasht-e Bayaz fault provide a slip rate of 5.2-4.3 mm/yr for this fault. AU - Fattahi, Morteza AU - Talebian, Morteza AU - Khatib, Mohammad M. AU - Aghazadeh, Aydin AU - Amini, Hamideh AU - Ataei, Nina AU - Sloan, Robert A. AU - Ersek, Vasile IS - 1 PY - 2019 RN - earthquake (and fault related) SP - 1-9 JO - Journal of Seismology and Earthquake Engineering TI - Slip rate determination of Dasht-e Bayaz fault using single grain OSL dating of Miam Qanat system in eastern Iran UR - http://www.jsee.ir/index.php/jsee/article/view/652 VL - 21 ID - 41 ER - TY - JOUR AB - Trapped charge dating is a commonly used chronological tool in Earth Sciences and Archaeology. The two principle methods are luminescence dating and electron spin resonance. Both are based on stored energy produced by the absorption of natural radioactivity in common minerals such as quartz and feldspars and in some biological materials such as tooth enamel. Methodological developments in the last 20 years have substantially increased accuracy and precision. This essay introduces a compilation of papers that offers a taste of recent research into both method and application. AU - Feathers, James K. DO - 10.3390/mps3010024 KW - luminescence electron spin resonance chronology earth sciences archaeology IS - 1 PY - 2020 RN - Editorial SN - 2409-9279 SP - 24 JO - Methods and Protocols TI - Methods and applications in trapped charge dating VL - 3 ID - 128 ER - TY - JOUR AB - Luminescence dating is applied to sediments from Mwulu's Cave, whose lithics have been typologically considered Middle Stone Age (MSA) and have been previously assigned to what is called the Pietersburg industry. This industry is, however, poorly defined both chronologically and typologically. Luminescence methods were applied to both quartz and potassium feldspars by two different laboratories. Age results from single-grain quartz are much younger than those from multi-grain aliquots and this is attributed to the use of different fits to the growth curves and the effect of this on samples near saturation. Single-grain potassium feldspar ages are much older than the single-grain quartz ages. Application of various methods to address anomalous fading produced broadly consistent results among samples. Most K-feldspar samples appear to be about 90 ka. These are compared to other South African MSA sequences and industries. AU - Feathers, J. K. AU - Evans, M. AU - Stratford, D. J. AU - de la Peña, P. DA - 2020/08/01/ DO - 10.1016/j.quageo.2020.101092 KW - Luminescence Quartz Potassium feldspar Saturation Pietersburg IRSL Middle stone age PY - 2020 RN - archaeology SN - 1871-1014 SP - 101092 JO - Quaternary Geochronology TI - Exploring complexity in luminescence dating of quartz and feldspars at the Middle Stone Age site of Mwulu's cave (Limpopo, South Africa) UR - http://www.sciencedirect.com/science/article/pii/S1871101420300418 VL - 59 ID - 152 ER - TY - JOUR AB - The archaeological record in the Negro River in central Uruguay Republic is remarkable for its richness, including the presence of a significant number of Paleoindian fishtail points. As part of ongoing research on the earliest human occupations in this region, luminescence dating is applied to develop a terminal Pleistocene-Holocene regional chronology. Eight ages were derived from six samples taken from sedimentary fluvial deposits from two sites near the city of Paso de los Toros. The resulting dates span 11.8 and 1.04 ka corresponding to the Late Pleistocene and the whole Holocene. Because the chronology of the sedimentary sequences spanning these ages is poorly known, the presented results become a significant contribution to the construction of a chronostratigraphy sequence in the area. The results also show how single-grain dating can distinguish different components of mixed assemblages. AU - Feathers, James K. AU - Nami, Hugo G. DB - Cambridge Core DO - 10.1017/laq.2018.9 DP - Cambridge University Press ET - 04/26 IS - 3 PY - 2018 RN - archaeology SN - 1045-6635 SP - 495-513 JO - Latin American Antiquity TI - Luminescence dating of Late Pleistocene and Holocene sediments in Uruguay UR - https://www.cambridge.org/core/article/luminescence-dating-of-late-pleistocene-and-holocene-sediments-in-uruguay/3D525A34CC9C6C015A0B33141C62130E VL - 29 ID - 53 ER - TY - JOUR AB - ABSTRACT While there are numerous thick loess?palaeosol sequences preserved across the Carpathian Basin, well dated sites that provide terrestrial palaeoenvironmental records extending beyond last glacial?interglacial cycle are scarce. Robust chronologies are essential for correlations of loess with other long-term Quaternary records and to further understanding of the palaeoenvironment and climate of this important region beyond the last 125 ka. Here a new geochronology based on 13 post-infrared infrared stimulated luminescence ages focused on the lower part of the loess?palaeosol sequence at Erdut is presented. The results show that the lower part of the Erdut profile spans the penultimate glacial cycle (MIS 7 to MIS 5). The considerable sediments overlaying the investigated part of the profile suggest that this section spans two glacial cycles, rather than the previously suggested one. The most likely source of the discrepancy is the use of uncorrected infrared stimulated luminescence signal, which can cause age underestimation if not accounted for. This study demonstrates the need to revisit sites such as Erdut, re-date them using updated measurement protocols, and update existing palaeoenvironmental interpretations. AU - Fenn, Kaja AU - Durcan, Julie A. AU - Thomas, David S. G. AU - Banak, Adriano DA - 2020/05/01 DO - 10.1002/jqs.3201 KW - luminescence dating MARs MIS 6 pIRIR Quaternary IS - 4 PY - 2020 RN - loess SN - 0267-8179 SP - 582-593 JO - Journal of Quaternary Science TI - A 180 ka record of environmental change at Erdut (Croatia): a new chronology for the loess–palaeosol sequence and its implications for environmental interpretation UR - https://doi.org/10.1002/jqs.3201 VL - 35 Y2 - 2020/05/13 ID - 117 ER - TY - JOUR AB - A unique combined and multi-disciplinary wavelength multiplexed spectrometer is described. It is furnished with high-sensitivity imaging plate detectors, the power to which can be gated to provide time-resolved data. The system is capable of collecting spectrally resolved luminescence data following X-ray excitation [radioluminescence (RL) or X-ray excited optical luminescence (XEOL)], electron irradiation [cathodoluminescence (CL)] and visible light from light emitting diodes (LEDs) [photoluminescence (PL)]. Time-resolved PL and CL data can be collected to provide lifetime estimates with half-lives from microsecond timeframes. There are temperature stages for the high and low temperature experiments providing temperature control from 20 to 673 K. Combining irradiation, time resolved (TR) and TR-PL allows spectrally-resolved thermoluminescence (TL) and optically stimulated luminescence (OSL). The design of two detectors with matched gratings gives optimum sensitivity for the system. Examples which show the advantages and multi-use of the spectrometer are listed. Potential future experiments involving lifetime analysis as a function of irradiation, dose and temperature plus pump-probe experiments are discussed. AU - Finch, Adrian A. AU - Wang, Yafang AU - Townsend, Peter D. AU - Ingle, Martin DA - 2019/03/01 DO - 10.1002/bio.3606 KW - cathodoluminescence luminescence instrumentation luminescence lifetime photoluminescence radioluminescence thermoluminescence time-resolved spectroscopy X-ray excited optical luminescence IS - 2 PY - 2019 RN - instruments SN - 1522-7235 SP - 280-289 JO - Luminescence TI - A high sensitivity system for luminescence measurement of materials UR - https://doi.org/10.1002/bio.3606 VL - 34 Y2 - 2020/06/22 ID - 134 ER - TY - JOUR AB - The widespread aeolian deposits of the Central Asian steppes and piedmonts offer potential to better understand the dynamics of the major Eurasian climate subsystems over Quaternary timescales. However, current assumptions linking climate processes with aeolian activity remain poorly substantiated and potentially problematic: emerging datasets suggest that loess accumulation rates, and the timing of peak dust flux along the Tien Shan piedmont, are highly variable between sites; the degree to which desert dunes reflect wind regimes and therefore provide records of climate circulation is unknown; and the presumed genetic link between the region's desert dunes and piedmont loess deposits remains hypothetical. These uncertainties raise questions as to the nature of the relationship between aeolian flux, deposition and (palaeo)climate. Here we investigate the relationship between wind regimes and the distribution, morphology and timing of two aeolian landform types (dunes and loess) in the topographically diverse Ili Basin of southeast Kazakhstan and western China. We establish late Holocene ages for three dune sites and one loess profile and infer that the location and morphology of these landforms can be used to test their genetic link with recent wind regimes. We assess the morphologic characteristics of linear dunes at four sites using a semi-automated mapping approach, and analyse the variability in dune orientations with respect to sand-shifting wind trajectories identified from meteorological reanalysis data for each site. The most frequently occurring wind direction appears to be responsible for sediment supply, while the strongest winds drive dune orientation. Wind orientations are strongly influenced by topography. Back trajectories incorporating dust transport and deposition potential to the loess site suggest both westerly and northerly delivery of fine-grained material to the piedmont, and that the most common source areas lie in regions where surface sediment contains a mixture of coarse and fine-grained material to facilitate entrainment into suspension. AU - Fitzsimmons, Kathryn E. AU - Nowatzki, Maike AU - Dave, Aditi K. AU - Harder, Hartwig DA - 2020/02/15/ DO - 10.1016/j.palaeo.2019.109531 KW - Desert dunes Loess Dust transport pathways Ili Basin Geographic object-based image analysis (GEOBIA) PY - 2020 RN - aeolian SN - 0031-0182 SP - 109531 JO - Palaeogeography, Palaeoclimatology, Palaeoecology TI - Intersections between wind regimes, topography and sediment supply: Perspectives from aeolian landforms in Central Asia UR - http://www.sciencedirect.com/science/article/pii/S0031018219308843 VL - 540 ID - 15 ER - TY - JOUR AB - Riverine Plain palaeochannels record periods of fluvial activity for Late Pleistocene southeastern Australia. In an attempt to develop a more detailed palaeoenvironmental record for this semi-arid region, we investigate the fine overbank sediments of the palaeochannel fill that cap and underlie the coarser-grained fluvial channel sands of the Tombullen (41–29 thousand years (ka) ago) and the Yanco (29–18 ka) phases. New single grain Optically Stimulated Luminescence (OSL) age determinations for the overlying palaeochannel fills suggest an overall slowing of sedimentation rates since the phase of fluvial activity in late Marine Isotope Stages 3 and 2. δ13CTOC data for the palaeochannel fill sediments range between −28‰ and −22‰, implying variable C4 contributions (0–40%) to a predominantly C3 vegetation mosaic. Modelled C4 abundance for the last 50 thousand years (kyr) decreased from 40% to 10% at around 40 ka with predicted representation remaining low towards the Last Glacial Maximum (LGM). Post LGM C4 grasses are seen to expand to 30–40% and sustained through the Holocene. Pollen preservation is restricted to the upper two metres of the cores, with the distribution showing shifts in dominance from Poaceae and Asteraceae to Eucalyptus up sequence. Increasing Eucalyptus/Poaceae ratios correspond with increasing C4 abundance suggesting that as woodland expanded in the Holocene the associated decreasing grass component shifted from C3 to C4. However, some evidence for the persistence of Poaceae and/or Asteraceae dominance argues that the likely shift from C3 to C4 grasses during the Holocene was in places independent of expanding woodland. Bulk sediment elemental ratios reveal wetting and drying cycles during the deposition of the overbank deposits. While these traits appear to be a product of local sedimentation changes, rather than regional climate, our model of C4 contraction and subsequent expansion across the last 50 kyr is likely reflecting changing summer monsoon intensity and its effects on regional aridity. AU - Forbes, Matt AU - Jankowski, Nathan AU - Cohen, Tim AU - Hopf, Felicitas AU - Mueller, Daniela AU - Bird, Michael AU - Haberle, Simon AU - Jacobs, Zenobia DA - 2020/05/01/ DO - 10.1016/j.palaeo.2019.109533 KW - Palaeochannels Murray Darling Basin Carbon isotopes Optically stimulated luminescence C4 grasses Last Glacial Maximum PY - 2020 RN - fluvial SN - 0031-0182 SP - 109533 JO - Palaeogeography, Palaeoclimatology, Palaeoecology TI - Palaeochannels of Australia's Riverine Plain - Reconstructing past vegetation environments across the Late Pleistocene and Holocene UR - http://www.sciencedirect.com/science/article/pii/S0031018219308090 VL - 545 ID - 59 ER - TY - JOUR AB - Physical stratigraphy, architecture and evolution of barrier systems in hypertidal environments (tidal range above 6 m) are understudied, and depositional controls are poorly understood compared with wave-dominated barrier systems and barrier spits in microtidal, mesotidal and macrotidal settings. Based on vibracores, ground-penetrating radar, radiocarbon and optically stimulated luminescence age data, the formation and evolution of the hypertidal barrier system of Pointe du Banc, north-western France has been reconstructed. The study shows that the barrier spit has a complex composite sedimentary architecture consisting of wave-dominated and tide-dominated sedimentary bodies. A morpho-sedimentary model is presented that demonstrates how barrier-spit progradation resulting from littoral drift was the main manner of spit elongation, whereas sediment convergence caused by landward migration of swash bars and seaward migration of tidal dunes caused the spit terminus to grow in height and width. These results suggest that long-term accretion rates varied considerably in response to changes in sediment supply. Variations in storminess together with the large-scale topography of the coast controlled the sediment supply and thus the evolution of the barrier system during latest Holocene. Despite architectural complexity, hypertidal barrier systems preserve records of past climate changes. AU - Fruergaard, Mikkel AU - Tessier, Bernadette AU - Poirier, Clément AU - Mouazé, Dominique AU - Weill, Pierre AU - Noël, Suzanne DA - 2020/01/01 DO - 10.1111/sed.12652 KW - Coastal evolution depositional controls ground-penetrating radar increased storminess and sediment supply North-West France optically stimulated luminescence dating IS - 1 PY - 2020 RN - coastal SN - 0037-0746 SP - 502-533 JO - Sedimentology TI - Depositional controls on a hypertidal barrier-spit system architecture and evolution, Pointe du Banc spit, north-western France UR - https://doi.org/10.1111/sed.12652 VL - 67 Y2 - 2020/07/06 ID - 168 ER - TY - JOUR AB - Lake Donggi Cona is a key area for the exploration of the prehistoric settlement of the inner Tibetan Plateau because of its location in the joint of the higher inner Tibetan Plateau and the upper Yellow River valley. Here, we carried out archeological investigation on the lake basin, and a total of 256 pieces of stone artifacts were collected from the surface of the DJCN 3-2-2 site on the northern shore terraces of the lake. In addition, AMS14C and OSL dating were performed on hearths and section (DJCN 3-2-2), respectively; meanwhile environmental proxies, including grain size, charcoal, magnetic susceptibility, fungal spore, and pollen, were analyzed. The results indicate that the AMS14C ages of the charcoal range between ~5.4 and 5.0 cal. ka BP, consistent with OSL dating from the charcoal layers in the DJCN 3-2-2 section (~5.5 ka BP). The functional analysis of the stone artifacts and dating results showed that the site was a seasonal, relative long-term, and central camp which was used for processing of stone artifacts, cutting and consuming food and the production of daily necessities. Charcoal, magnetic susceptibility, and fungal spores from the DJCN 3-2-2 section revealed that prehistoric human activities began at ~5.8 ka BP and significantly intensified during the period of ~5.6?5.5 ka BP and then gradually weakened. Pollen assemblages indicated that the vegetation was dominated by alpine steppe during the period of ~5.8?5.0?ka BP, indicative of a relatively warmer and wetter climatic condition during this period. Taken together, we infer that under the impact of the Neolithic culture in lower altitude of upper Yellow River valley and Microlithic culture in the higher altitude inner Plateau, a Neolithic-Zongri culture had emerged in the transitional region between these two cultures during middle Holocene. AU - Gao, Jingyi AU - Hou, Guangliang AU - Wei, Haicheng AU - Chen, Youcheng AU - E, Chongyi AU - Chen, Xiaoliang AU - Lancuo, Zhuoma DA - 2020/05/01 DO - 10.1177/0959683619895583 IS - 5 PY - 2020 RN - archaeology SN - 0959-6836 SP - 657-671 JO - The Holocene TI - Prehistoric human activity and its environmental background in Lake Donggi Cona basin, northeastern Tibetan Plateau UR - https://doi.org/10.1177/0959683619895583 VL - 30 Y2 - 2020/05/06 ID - 103 ER - TY - JOUR AB - Barozh 12 is a Middle Paleolithic (MP) open-air site located near the Mt Arteni volcanic complex at the margins of the Ararat Depression, an intermontane basin that contains the Araxes River. Sedimentology, micromorphology, geochronology, biomarker evidence, together with an assessment of artifact taphonomy permits the modelling of site formation processes and paleoenvironment at a level of detail not previously achieved in this area. Obsidian MP artifacts were recovered in high densities at Barozh 12 from four stratigraphic units deposited during marine oxygen isotope stage 3 (MIS 3) (60.2 ± 5.7–31.3 ± 3 ka). The MIS 3 sequence commences with low energy alluvial deposits that have been altered by incipient soil formation, while artifact assemblages in these strata were only minimally reworked. After a depositional hiatus, further low energy alluvial sedimentation and weak soil formation occurred, followed by higher energy colluvial (re)deposition and then deflation. Artifacts in these last stratigraphic units were more significantly reworked than those below. Analysis of plant leaf wax (n-alkane) biomarkers shows fluctuating humidity throughout the sequence. Collectively the evidence suggests that hunter-gatherers equipped with MP lithic technology repeatedly occupied this site during variable aridity regimes, demonstrating their successful adaptation to the changing environments of MIS 3. AU - Glauberman, Phil AU - Gasparyan, Boris AU - Sherriff, Jennifer AU - Wilkinson, Keith AU - Li, Bo AU - Knul, Monika AU - Brittingham, Alex AU - Hren, Michael T. AU - Arakelyan, Dmitri AU - Nahapetyan, Samvel AU - Raczynski-Henk, Yannick AU - Haydosyan, Hayk AU - Adler, Daniel S. DA - 2020/05/15/ DO - 10.1016/j.quascirev.2020.106276 KW - Late Pleistocene MIS 3 Middle Paleolithic Site formation Geoarchaeology Sedimentology Micromorphology IRSL Dating Armenia PY - 2020 RN - archaeology SN - 0277-3791 SP - 106276 JO - Quaternary Science Reviews TI - Barozh 12: Formation processes of a late Middle Paleolithic open-air site in western Armenia UR - http://www.sciencedirect.com/science/article/pii/S0277379120302389 VL - 236 ID - 116 ER - TY - JOUR AB - Far’ah II is an open-air site in the north western Negev desert (Israel). Previous excavations in the 1970’s revealed a rich, in situ Middle Paleolithic (MP) assemblage composed of flint and limestone artifacts, animal bones and charcoal. Renewed excavation at the site were undertaken in 2017, to re-date it and provide a more accurate constrain to the sites’ age, as well as collect samples for paleoclimatic proxies. Our new Optically Stimulated Luminescence and 14C ages together with the stable oxygen isotope signature of the loess sediments, constrain the age of the upper archaeological horizon to <49 ka. This age agrees with the younger limit of 60–50 ka, obtained by Electron Spin Resonance ages, measured in the 1990’s. The heavy δ18O values in carbonates point to cooler climatic conditions than those that prevailed during the preceding short, warm episode between 58 and 49 ka. The fauna, pollen and charcoal collected during the excavation portray a savanna-like environment with a mix of Irano-Turanian and Saharo-Arabian elements and a minor Mediterranean component. The lithic assemblage exhibits large technological variability typical of the Late MP (LMP), amongst which are technological traits that are clearly present in the Initial Upper Paleolithic (IUP) assemblages at the nearby, and roughly contemporaneous, site of Boker Tachtit. If population replacement was the trigger to the MP-UP transition, we would have expected to see a clear break in the cultural material at the onset of the Upper Paleolithic. The semi-arid north western Negev, as an interim region between the Mediterranean and Saharo-Arabian ecozones could have facilitated interaction between populations moving north or south due to fluctuating climatic conditions and changes in population pressures, possibly leading to the emergence of new technological traditions that are observed in the later UP. AU - Goder-Goldberger, Mae AU - Crouvi, Onn AU - Caracuta, Valentina AU - Kolska Horwitz, Liora AU - Neumann, Frank H. AU - Porat, Naomi AU - Scott, Louis AU - Shavit, Roi AU - Jacoby-Glass, Yael AU - Zilberman, Tami AU - Boaretto, Elisabetta DA - 2020/06/01/ DO - 10.1016/j.quascirev.2020.106304 KW - Pleistocene Prehistoric hunter-gatherers Negev desert Paleoenvironment Middle east Stable isotopes PY - 2020 RN - archaeology SN - 0277-3791 SP - 106304 JO - Quaternary Science Reviews TI - The Middle to Upper Paleolithic transition in the southern Levant: New insights from the late Middle Paleolithic site of Far’ah II, Israel UR - http://www.sciencedirect.com/science/article/pii/S0277379120302663 VL - 237 ID - 141 ER - TY - JOUR AB - South-Eastern coastal plains of India experience some of the major delta formations of the Indian subcontinent majorly affected by fluctuations of the Indian summer monsoon (ISM) and sea level. Past shoreline signatures in the form of palaeo beach ridges in Kaveri delta (Tamil Nadu, India), suggest a wave-dominated delta and thus past sea-level variations affecting directly the sedimentary dynamics of the Kaveri river forcing the river to either aggrade or prograde. Chronostratigraphic and foraminiferal study of the 25 m deep sediment core taken 2.5 km onshore from Tamil Nadu coast, Kaveri delta shows evidence of changing coastline over the last 150 ka. Various units in the core reflect eight major phases of increased sea level (~3.4 ka, ~5.0 ka, 9–6 ka, 60–57 ka, 89–81 ka, ~102 ka,~121 ka and 143–140 ka) partly coinciding with the global climate cycles MIS 1, MIS 3, MIS 5, MIS 6 respectively during the late Quaternary period. During ~121 ka and 9–6 ka, direct signature of marine transgression is observed by the presence of foraminifera in the core location. The study also shows that the sea transgression during ~121 ka was much longer-lasting and higher than during 9–6 ka, even though not revealed in the Quaternary sea level curve given by previous authors. Depositional breaks are observed in the core during periods of lower sea levels as the river responded by incision. Total organic matter of the deposition between 9–6 ka was observed as high as 2.5–6% suggesting oxygen stressed conditions during the period. AU - Goswami, Kartika AU - Krishnan, Sivakumar AU - Kumerasan, Anbarasu AU - Sadasivam, Senthil Kumar AU - Kumar, Pankaj AU - Jaiswal, Manoj. K. DO - 10.1515/geochr-2015-0112 LA - English IS - 1 PY - 2019 RN - coastal SP - 125-137 JO - Geochronometria TI - Luminescence chronology of fluvial and marine records from subsurface core in Kaveri delta, Tamil Nadu: Implications to sea level fluctuations UR - https://content.sciendo.com/view/journals/geochr/46/1/article-p125.xml VL - 46 ID - 106 ER - TY - JOUR AB - Sequences of abandoned alluvial surfaces are ubiquitous desert landscapes considered as responding to Quaternary-timescale climatic fluctuations and tectonic activity. The post-depositional evolution surficial properties of these alluvial surfaces change with time: (a) surface clast breakdown and development of desert pavement, (b) dust and salts accumulation (c) Reg (gravelly) desert soil evolution. In the present study, we focus on the hydrological response and the resulting erosional processes, to these changes in surface properties over a sequence of late-Pleistocene-Holocene, abandoned alluvial surfaces in Nahal Evrona catchment at the hyperarid southern Arava Valley north of the towns of Eilat (Israel) and Aqaba (Jordan). The methods used in the study are: (a) simulated rainfall experiments to determine hydrological characteristics, (b) Terrestrial Laser Scanning (TLS) to determine surface roughness, (c) OSL dating for the chronology, (d) surface and soil descriptions and measurements and grain-size analyses to determine texture of the uppermost Av horizon of the Reg soil (e) GIS analysis of the new drainage network developing over the older abandoned alluvial surfaces. The results show that with time, roughness decreases, infiltration decreases to about 8–9% relative to present rates, point runoff generation increases >5 fold, and as a result, rill and gully erosion initiated, finally leading to the destruction of the alluvial surface. Under the current hyper-arid climate in the southern Negev desert, between ~30 and 50 ka of surface weathering and soil development are required before significant runoff is generated and >100 ka until effective runoff initiates rill and gully erosion over these abandoned alluvial surfaces. This local-source runoff and gully erosion essentially destroys the alluvial surfaces in the southern Arava valley within a period of 400–500 ka. Roughness, extracted from spaceborne Lidar scanning, which is inversely related to surface age, directly reduces friction and resistance to runoff, can provide an estimate for the hydrological characteristics of the surfaces. This can support applications such as rainfall-runoff models, risk assessment, etc. AU - Greenbaum, Noam AU - Mushkin, Amit AU - Porat, Naomi AU - Amit, Rivka DA - 2020/06/01/ DO - 10.1016/j.geomorph.2020.107101 KW - Abandoned alluvial surface Desert pavement roughness Runoff Gully erosion PY - 2020 RN - fluvial SN - 0169-555X SP - 107101 JO - Geomorphology TI - Runoff generation, rill erosion and time-scales for hyper-arid abandoned alluvial surfaces, the Negev desert, Israel UR - http://www.sciencedirect.com/science/article/pii/S0169555X20300738 VL - 358 ID - 69 ER - TY - JOUR AB - The loess-paleosol archive from Mircea Vodă (Romania) represents one of the most studied sections in Europe. We are applying here the current state of the art luminescence dating protocols for revisiting the chronology of this section. Analysis were performed on fine (4–11 µm) and coarse (63–90 µm) quartz extracts using the single aliquot regenerative (SAR) optically stimulated luminescence (OSL) dating protocol. Laboratory generated SAR dose response curves in the high dose range (5 kGy for fine quartz and 2 kGy for coarse quartz) were investigated by employing a test dose of either 17 or 170 Gy. The results confirm the previously reported different saturation characteristics of the two quartz fractions, with no evident dependency of the equivalent dose (De) on the size of the test dose. The OSL SAR ages are discussed and compared to the previously obtained results on quartz and feldspars. The previous reports regarding the chronological discrepancy between the two quartz fractions are confirmed. However, while previous investigations on other sites concluded that this discrepancy appears only above equivalent doses of about 100 Gy, here fine grain quartz ages underestimate coarse quartz ages starting with equivalent doses as low as around 50 Gy. AU - Groza-Săcaciu, Ștefana-M. AU - Panaiotu, Cristian AU - Timar-Gabor, Alida DO - 10.3390/mps3010019 IS - 1 PY - 2020 RN - loess SN - 2409-9279 SP - 19 JO - Methods and Protocols TI - Single aliquot regeneration (SAR) optically stimulated luminescence dating protocols using different grain-sizes of quartz: Revisiting the chronology of Mircea Vodă Loess-Paleosol master section (Romania) UR - https://www.mdpi.com/2409-9279/3/1/19 VL - 3 ID - 45 ER - TY - JOUR AB - The chronology of Pleistocene strandplains remains a challenge to this day. The lack of reliable geochronology methods arises from the fact that ages from the Pleistocene sequences are beyond radiocarbon age limit method and, sometimes, near the saturation limits to luminescence dating on quartz, which may introduce uncertainties in the results. Also, choosing different curve fits for the dose-response curve leads to geological incoherent results. In this paper, we evaluated three approaches on curve fit equations (single saturating exponential (SSE), double saturating exponential (DSE) or the SSE + Linear (E + L). We also compared the three scenarios with geological evidences such as sedimentary structures, like plane-parallel lamination, and the presence Ophiomorpha nodosa ichnofossil at Paranaguá and Superagüi strandplains, Southern Brazil. Since geological evidences indicate deposition under wave-dominated shoreline, the comparison to Quaternary sealevel curves restricts the beach ridges deposition to high relative sealevel intervals. Our results show that, despite being mathematically consistent, DSE and E + L curve fits lead to geological inconsistent results. The luminescence results using SSE curve fit are geologically consistent and suggest the occurrence of MIS 7e barrier on Paranaguá and Superagüi strandplains, the farther north occurrence of the Barreira II (195–220 ky) correspondent to the Rio Grande do Sul strandplain. However, we stress out that luminescence dating results near the saturation limit must be interpreted with caution, and preferably supported by other evidences. AU - Guedes, Carlos Conforti Ferreira AU - Nascimento, Mylene Giseli do AU - Angulo, Rodolfo José AU - Souza, Maria Cristina de DA - 2020/03/01/ DO - 10.1016/j.jsames.2019.102478 KW - Beach ridges OSL saturation Paranaguá strandplain Superagüi strandplain PY - 2020 RN - coastal SN - 0895-9811 SP - 102478 JO - Journal of South American Earth Sciences TI - Geological evidences as a guide to OSL dating interpretation and northern occurrence of MIS 7e barrier at Southern Brazil UR - http://www.sciencedirect.com/science/article/pii/S0895981119304067 VL - 98 ID - 178 ER - TY - JOUR AB - Landslides provide a means to study tectonic and climate forcing on hillslopes in mountainous terrain. Landslides are common in the upper Yellow River valley on the northeastern Tibetan Plateau, some of which even blocked the Yellow River. However, uncertainty remains on the trigger factors for these palaeolandslides, and emplacement timing of palaeolandslides could be essential to resolve these issues. In this study, single aliquot regeneration protocols of quartz was applied to a perched lake overlying Xiazangtan landslide mass. Optically stimulated luminescence ages at the basal of this lacustrine lake constrained a minimum age for this landslide, reflecting that Xiazangtan landslide that occurred at or before 44.9?±?3.2?ka, the marine isotope stage (MIS) 3. Wetter conditions and extensive rainfall in MIS 3 may have resulted in a rapid growth of pore pressure and loss of the apparent cohesion of thin soils, eventually causing the failure of Xiazangtan landslide, while earthquake could not be ruled out in such a tectonically active area. Xiazangtan landslide plays a significant role in shaping mountainous topography. This landslide, for instance, reduced hillslope gradients along the slope profile, added noise to river longitudinal profile development, and interrupted the formation of fluvial terraces by slowing down fluvial bedrock incision. AU - Guo, Xiaohua AU - Wei, Jiuchuan AU - Song, Zhaojun AU - Lai, Zhongping AU - Yu, Lupeng DA - 2020/07/01 DO - 10.1002/gj.3754 KW - landslide northeastern Tibetan Plateau OSL dating upper Yellow River in China IS - 7 PY - 2020 RN - earthquake (and fault related) SN - 0072-1050 SP - 5498-5507 JO - Geological Journal TI - Optically stimulated luminescence chronology and geomorphic imprint of Xiazangtan landslide upon the upper Yellow River valley on the northeastern Tibetan Plateau UR - https://doi.org/10.1002/gj.3754 VL - 55 Y2 - 2020/07/06 ID - 173 ER - TY - JOUR AB - In this study we compared De results obtained from single-aliquot (SA) and single-grain (SG) measurements on potassium rich feldspars (K-feldspars) from the Nihewan Basin, north China, based on the multiple-elevated-temperature post-infrared infrared (MET-pIRIR) stimulated luminescence. Discrepancy was observed between the SA and SG De results. Potential reasons for such discrepancy, including residual doses, sensitivity changes, fading rates, internal dose rates, and/or the combination of these possibilities, were investigated. Our results indicate that the disagreement between the SA and SG De results are mainly caused by the different fading rates and, to a small extent, by the internal K contents variations of different grains. Our study highlights the importance to investigate the relationship of single-grain De values and the luminescence behavior of individual grains, such as brightness. For partial-bleached or post-depositional mixed K-feldspar samples, statistical analysis should be conducted only on the grains with the same fading rate. AU - Guo, Yujie AU - Li, Bo AU - Zhao, Hailong DA - 2020/03/01/ DO - 10.1016/j.quageo.2019.101040 KW - K-feldspar Single grain Single aliquot Fading rate Brightness PY - 2020 RN - basic research SN - 1871-1014 SP - 101040 JO - Quaternary Geochronology TI - Comparison of single-aliquot and single-grain MET-pIRIR De results for potassium feldspar samples from the Nihewan Basin, northen China UR - http://www.sciencedirect.com/science/article/pii/S1871101419300901 VL - 56 ID - 34 ER - TY - JOUR AB - The seismogenic potential of active faults for seismic hazard analyses are typically constrained using slip rates. These parameters, derived from numerically dated Quaternary deposits and landforms, have a critical impact on seismic hazard estimates with relevant societal and economic implications. Recently published geomorphological and paleoseismic investigations on active normal faults in the intraplate Iberian Chain (Spain), based on OSL ages from a now closed commercial laboratory, indicate anomalously high slip rates and paleoearthquake frequencies and extremely high fluvial incision rates. Parameters derived from those numerical ages have been used for seismic hazard assessments at critical facilities. This work revisits the chronology of Quaternary deposits associated with several faults applying various geochronological methods: Electro Spin Resonance (ESR), AMS Radiocarbon, Optically Stimulated Luminescence (OSL) and U-series dating. The totality of the new numerical ages is markedly different from the previously published OSL ages. The thirteen new ESR, OSL and U-series ages are systematically between three and six times older than the previous OSL ages. These data strongly suggest that previous ages overestimate the activity of the faults and seismic hazard in the region. The lack of validity of the revisited OSL analyses is attributed to inadequate dating procedures. Slip rates calculated with the new numerical ages are consistent with the slip rates estimated using Pliocene markers in the Iberian Chain and the slip rates published for other normal faults in eastern Spain. The new geochronological data also indicate reasonable fluvial incision rates, comparable with those estimated in nearby regions. The findings presented in this work have also implications for other Quaternary geomorphological studies in Spain based on potentially non-valid OSL ages. AU - Gutiérrez, Francisco AU - Moreno, Davinia AU - López, Gloria I. AU - Jiménez, Fernando AU - del Val, Miren AU - Alonso, Mª Jesús AU - Martínez-Pillado, Virginia AU - Guzmán, Oswaldo AU - Martínez, David AU - Carbonel, Domingo DA - 2020/08/15/ DO - 10.1016/j.geomorph.2020.107233 KW - Geochronology Paleoseismology Fault characterization Geomorphological mapping PY - 2020 RN - earthquake (and fault related) ESR review SN - 0169-555X SP - 107233 JO - Geomorphology TI - Revisiting the slip rate of Quaternary faults in the Iberian Chain, NE Spain. Geomorphic and seismic-hazard implications UR - http://www.sciencedirect.com/science/article/pii/S0169555X20302051 VL - 363 ID - 145 ER - TY - JOUR AB - Late Pleistocene tephras derived by large explosive volcanic eruptions are widespread in the Mediterranean and surrounding areas. They are important isochronous markers in stratigraphic sections and therefore it is important to constrain their sources. We report here tephrochronology results using multiple criteria to characterize the volcanic products of the Late Pleistocene Ciomadul volcano in eastern–central Europe. This dacitic volcano had an explosive eruption stage between 57 and 30 ka. The specific petrological character (ash texture, occurrence of plagioclase and amphibole phenocrysts and their compositions), the high-K calc-alkaline major element composition and particularly the distinct trace element characteristics provide a strong fingerprint of the Ciomadul volcano. This can be used for correlating tephra and cryptotephra occurrences within this timeframe. Remarkably, during this period several volcanic eruptions produced tephras with similar glass major element composition. However, they differ from Ciomadul tephras by glass trace element abundances, ratios of strongly incompatible trace elements and their mineral cargo that serve as discrimination tools. We used (U-Th)/He zircon dates combined with U-Th in situ rim dates along with luminescence and radiocarbon dating to constrain the age of the explosive eruptions of Ciomadul that yielded distal tephra layers but lack of identified proximal deposits. AU - Harangi, Szabolcs AU - Molnár, Kata AU - Schmitt, Axel K. AU - Dunkl, István AU - Seghedi, Ioan AU - Novothny, Ágnes AU - Molnár, Mihály AU - Kiss, Balázs AU - Ntaflos, Theodoros AU - Mason, Paul R. D. AU - Lukács, Réka DO - 10.1002/jqs.3177 IS - 1-2 PY - 2020 RN - tephra (and volcanic related) SN - 0267-8179 SP - 232-244 JO - Journal of Quaternary Science TI - Fingerprinting the Late Pleistocene tephras of Ciomadul volcano, eastern–central Europe UR - https://onlinelibrary.wiley.com/doi/abs/10.1002/jqs.3177 VL - 35 ID - 88 ER - TY - JOUR AB - This work demonstrated the combined utility of empty tube subtraction, over-modulation, native signal subtraction and spectral filtration in low level dosimetry using commercial sugar samples. The native signal component was found to have an effective peak to peak equivalent of 150 mGy. If the zero dose native signal is accurately modeled and subtracted, the detection limit was estimated to be 0.2 Gy although intercept uncertainties were as low as 25 mGy. This was enabled by resultant slope uncertainties as low as 3% with residual variations of approximately 0.1 Gy. AU - Hayes, Robert B. AU - Abdelrahman, Fatma M. DA - 2020/03/01/ DO - 10.1016/j.apradiso.2020.109038 KW - Electron paramagnetic resonance Dosimetry Sugar Radiological emergency response Nuclear forensics EPR PY - 2020 RN - dosimetry ESR SN - 0969-8043 SP - 109038 JO - Applied Radiation and Isotopes TI - Low level EPR dosimetry of a commercial sugar UR - http://www.sciencedirect.com/science/article/pii/S0969804319308541 VL - 157 ID - 26 ER - TY - JOUR AB - Diatomaceous earth is found in various locations around the planet. It is caused by the deposited exoskeleton material formed by the death of large concentrated populations of diatoms. The exoskeleton is effectively pure silicate and as such becomes a prospective material for retrospective dosimetry and dating. This work investigated the thermoluminescence (TL) and optically stimulated luminescence properties of commercially obtained diatomaceous earth. The material was not found to have useful dosimetric properties with conventional TL methodologies but did provide large dose estimates using the Single Aliquot Regeneration technique on some subset samples. These findings for organic silicate did suggest some mechanisms explaining the sensitization process in geological silicate materials utilized in dosimetry and dating. Electron paramagnetic resonance was identified as a potential future method for evaluating this material as it revealed unique signal components not found in igneous or commercially produced silicates. AU - Hayes, Robert B. AU - O’Mara, Ryan P. AU - Hooper, David A. DO - 10.1093/rpd/ncz013 IS - 3 PY - 2019 RN - dosimetry ESR SN - 0144-8420 SP - 310-319 JO - Radiation Protection Dosimetry TI - Initial TL/OSL/EPR considerations for commercial diatomaceous earth in retrospective dosimetry and dating UR - https://doi.org/10.1093/rpd/ncz013 VL - 185 Y2 - 7/6/2020 ID - 172 ER - TY - JOUR AB - Bayesian inference has been applied extensively to chronologies in archaeological science since it provides several advantages over the (classic) frequentist approach. One of the most important aspects of applying Bayesian methods is their capacity to consider the stratigraphic relationship between ages. In luminescence dating, a crucial motivation for applying Bayesian modelling is the ability to address the systematic shared uncertainty. The recently deployed R package ‘BayLum’ was developed to ameliorate luminescence-based chronologies by employing Bayesian modelling. Our contribution aims at estimating the impact of stratigraphic order and systematic shared uncertainty on the age results. In this paper, for the first time, we present a comprehensive luminescence-based chronology for the Middle-Upper Palaeolithic site of Mirak. This open-air site is located in the northern fringes of the Iranian central desert, which is considered to be one of the dispersal corridors for hominins (Neanderthal and modern human) living across western and central Asia. We compare chronologies derived by frequentist and Bayesian methods to discuss the effect of stratigraphic ordering and the correlation between samples due to systematic shared uncertainty. Our investigations indicate that applying the stratigraphic order, when age uncertainty overlap one another, plays a fundamental role in reducing the uncertainty. At the site Mirak the obtained Bayesian chronology considering the stratigraphic order for the layer containing predominately Upper Palaeolithic techno-complex results in 21–28 ka. The age of the intermediate layer is in the range of 26–33 ka, and the lowermost layer containing Middle Palaeolithic assemblage gives the age-range of 43–55 ka. These results indicate that Late Pleistocene humans have exploited the site during MIS 3–2. Furthermore, the chronology gives further evidence to the hypothesis that the Iranian central plateau served as a frequently used habitat and dispersal corridor for human groups populating western and central Asia. AU - Heydari, Maryam AU - Guérin, Guillaume AU - Kreutzer, Sebastian AU - Jamet, Guillaume AU - Kharazian, Mohammad Akhavan AU - Hashemi, Milad AU - Nasab, Hamed Vahdati AU - Berillon, Gilles DA - 2020/08/01/ DO - 10.1016/j.quageo.2020.101082 KW - Bayesian modelling Luminescence dating Chronology Palaeolithic Iran PY - 2020 RN - archaeology basic research SN - 1871-1014 SP - 101082 JO - Quaternary Geochronology TI - Do Bayesian methods lead to more precise chronologies? ‘BayLum’ and a first OSL-based chronology for the Palaeolithic open-air site of Mirak (Iran) UR - http://www.sciencedirect.com/science/article/pii/S1871101420300315 VL - 59 ID - 153 ER - TY - JOUR AB - To extend the applications of BeOSL technology beyond whole body dosimetry, three new dosemeters were developed: an eye lens dosemeter and a finger ring dosemeter using a single BeOSL detector element and a two-element area dosemeter for work place monitoring. This work describes the new dosemeters, provides data from the radiological characterization of the dosemeters according to IEC 62387 and addresses the issue of measurement uncertainty and detection limits achievable with the BeOSL systems. The response of the new extremity dosemeters in terms of Hp(3) and Hp(0,07) with respect to photon energy and angle of incidence fulfills the IEC 62387 requirements. The area dosemeter fulfills the IEC requirements for workplace monitoring but not the more stringent requirements for environmental dosimetry, due to an under-response for angles of incidence larger than 60°. The results of an uncertainty analysis for the dose evaluation of single element dosemeters show that detection limits in the range of 26 μSv–43 μSv can be achieved if dedicated background dosemeters are used. AU - Hoedlmoser, H. AU - Greiter, M. AU - Bandalo, V. AU - Brönner, J. AU - Kleinau, P. AU - Haninger, T. AU - Mende, E. AU - Emmerl, M. AU - Scheubert, P. AU - Esser, R. AU - Figel, M. DA - 2020/03/01/ DO - 10.1016/j.radmeas.2020.106258 KW - Extremity dosimetry Eye lens Finger ring OSL BeO Area dosimetry PY - 2020 RN - dosimetry SN - 1350-4487 SP - 106258 JO - Radiation Measurements TI - Individual monitoring with BeOSL dosemeters: New dosemeters for extremity and area dosimetry UR - http://www.sciencedirect.com/science/article/pii/S1350448720300226 VL - 132 ID - 77 ER - TY - JOUR AB - Tsunamis have repeatedly hit the shores of Oman (Northern Arabian Sea) in historical times (e.g. 1945, 2013). These events had small (< 3 m) wave heights and short inundation distances, but it is unclear if much stronger events can affect the area. Boulder deposits and fine-grained sediments are described from the north coast of Oman, which are interpreted as evidence for much larger pre-historic tsunami events. No systematic dating was available, which hampers interpretation. In this paper we report radiocarbon dating results for marine organisms in these deposits and present luminescence dating of fine-grained units. We document new sedimentological and archaeological evidence for past tsunamis and describe new data on the impact of the 1945 Makran tsunami in Oman. Since the coast of Oman is prone to tropical storms, we discuss the possibility of sediment transport by cyclones and we compare our findings with recent evidence of boulder transport by storms worldwide. We argue that our results favor an interpretation as tsunamites based on sedimentological, archaeological, and spatial criteria. The dating results allow us to show that a tsunami hit the northern coast of Oman around 1000 years ago. A comparison with historical tsunami impact indicates that this palaeo-event exceeded in size all modern examples in the study area. We speculate that only a large earthquake at the Makran Subduction Zone can produce a tsunami of this size. In that case, the earthquake might have at least partially ruptured the western Makran, which would imply that the western Makran is not completely unlocked. Hazard scenarios based on historical data underestimate the tsunami threat in the Northern Arabian Sea. AU - Hoffmann, Gösta AU - Grützner, Christoph AU - Schneider, Bastian AU - Preusser, Frank AU - Reicherter, Klaus DA - 2020/01/01/ DO - 10.1016/j.margeo.2019.106068 KW - Extreme wave events Tsunami Oman Arabian Sea Beach processes Hazard PY - 2020 RN - coastal SN - 0025-3227 SP - 106068 JO - Marine Geology TI - Large Holocene tsunamis in the northern Arabian Sea UR - http://www.sciencedirect.com/science/article/pii/S0025322719302154 VL - 419 ID - 81 ER - TY - JOUR AB - The DosiVox programme is used to reconstruct radiation transport in complex depositional environments. Using two archaeological case studies from ancient Egypt, the burial environments for a selection of ceramic vessels are reconstructed using the DosiVox programme, allowing the simulation of the emission and transport of radiation throughout these burial environments. From this simulation we can extract the external dose rate of the archaeological samples, a measurement necessary for determine a luminescence age. We describe in detail how DosiVox can be used to best advantage at sites with complex depositional histories and highlight that DosiVox is a valuable tool in luminescence dating. This work illustrates that DosiVox is, at present, unparalleled in reconstructing a more accurate and detailed external gamma dose rate which can significantly improve upon simplistic scaled geometric models. AN - 10.3390/mps2040091 AU - Hood, Amber G.E. AU - Highcock, Edmund G. IS - 4 PY - 2019 RN - dose rate archaeology SN - 2409-9279 SP - 91 JO - Methods and Protocols TI - Using DosiVox to reconstruct radiation transport through complex archaeological environments UR - https://www.mdpi.com/2409-9279/2/4/91 VL - 2 ID - 8 ER - TY - JOUR AB - Human activity and adaptation to the environmental changes on the Tibetan Plateau are under debate. Lhasa is the political and economic center of the Tibetan Autonomous Region, and was founded in 633 CE. The potential influence of changes in the landscape on the city's development remains unclear. In this paper, Optically Stimulated Luminescence and radiocarbon dating techniques were applied to determine the ages at which landforms have changed since the Last Glacial Maximum. Combining these results with archaeological evidence taken from two sites (Changguogougou and Qugong) in the Lhasa area, the relation between river migration and human adaptation was discussed. The results showed that the two terraces (T1 and T2) of the Lhasa River are fill and fill-cut terraces, and that these were formed after ∼0.9 ka and 0.08 cal ka BP, respectively. Land below an altitude of ∼3650 m above sea level was lower than the contemporary river level before ∼0.9 ka. With the down cutting of the Lhasa River, more land became available for habitation, and the flood risk to the city was also reduced. The sediments of the lower land around the Changguogou area appear to be composed of fluvial-lacustrine facies during the Last Glacial Maximum to Late Glacial period. Humans occupied the Changguogou area between ∼3.255 and 3.059 cal ka BP when there was weaker aeolian activity, and abandoned this area when aeolian activity increased. AU - Hu, Gang AU - Wang, Ping AU - Li, Dehong AU - Huang, Jianwei AU - Wang, Huiying AU - Yang, Xiaoyan AU - Zhang, Jiafu AU - Chen, Jie AU - Qiu, Menghan AU - Zhang, Aimin AU - Shi, Lingfan DA - 2020/01/20/ DO - 10.1016/j.quaint.2019.11.023 KW - OSL C Lhasa Changes in fluvial landscapes PY - 2020 RN - fluvial aeolian SN - 1040-6182 SP - 1-12 JO - Quaternary International TI - Landscape change and its influence on human activities in Lhasa basin of central Tibetan plateau since the last deglacial UR - http://www.sciencedirect.com/science/article/pii/S1040618219308602 VL - 536 ID - 35 ER - TY - JOUR AB - We studied the characteristics of the optically stimulated luminescence (OSL) signal of single-grain quartz from three sites in China, Italy, and Libya, including the brightness, decay curve and dose response curve (DRC) shapes, recuperation, and reproducibility. We demonstrate the large variation in OSL behaviors for individual quartz grains of different samples from different regions, and show that recuperation, sensitivity change, and reproducibility are independent of the brightness and decay curve shape of the OSL signals. The single-grain DRCs can be divided into at least eight groups with different characteristic saturation doses (D0), and a standardized growth curve (SGC) can be established for each of the DRC groups. There is no distinctive difference in the shape of OSL decay curves among different DRC groups, but samples from different regions have a difference in the OSL sensitivities and decay shapes for different groups. Many of the quartz grains have low D0 values (30–50 Gy), and more than 99% of the grains have D0 values of <200 Gy. Our results raise caution against the dating of samples with equivalent dose values higher than 100 Gy, if there are many low-D0 and ‘saturated’ grains. AU - Hu, Yue AU - Li, Bo AU - Jacobs, Zenobia DO - 10.3390/mps3010002 KW - OSL quartz standardized growth curves decay curve saturation dose IS - 1 PY - 2020 RN - basic research SN - 2409-9279 SP - 2 JO - Methods and Protocols TI - Single-grain quartz OSL characteristics: Testing for correlations within and between sites in Asia, Europe And Africa VL - 3 ID - 132 ER - TY - JOUR AB - The site of Blombos Cave (BBC) is well known for archaeological remains that have advanced our understanding of the development of modern human behaviour during the Middle Stone Age (MSA). Occupation of the cave occurred against a backdrop of landscape-scale environmental and sedimentary processes that provide the broader context for finer-scale interpretations of the site-formation history and archaeological patterns detected in the cave deposits. Aeolian and palaeosol sequences are abundant in the vicinity of BBC and these provide a partial view of the past landscapes available to the inhabitants of the cave. An important extension to the palaeo-landscape around BBC currently lies submerged on the Agulhas Bank, as sea levels were lower than at present for the entire period of human occupation of BBC. In this paper, we revisit the optically stimulated luminescence (OSL) chronology for the full sequence of sediment deposition inside BBC, increasing the number of dated samples to a total of 40 and revising the period of MSA occupation to between 97.7 ± 7.6 and 71.0 ± 5.7 ka (uncertainties at 95.4% probability). We describe the geological successions at four main areas around BBC, estimate the time of sediment deposition using OSL, and describe and interpret three seismic profiles on the Agulhas Bank, offshore of BBC. By correlating these onshore and offshore geological sequences with the sedimentary deposits inside BBC, we place the archaeological record within a landscape-scale chrono-stratigraphic framework to examine how environmental changes may have regulated the presence or absence of humans in the cave and surrounding terrain between about 100 and 70 ka. AU - Jacobs, Zenobia AU - Jones, Brian G. AU - Cawthra, Hayley C. AU - Henshilwood, Christopher S. AU - Roberts, Richard G. DA - 2020/05/01/ DO - 10.1016/j.quascirev.2019.07.032 KW - Optical dating Bayesian age model Relative sea level Palaeo-Agulhas Plain Human–environment interactions N1 - The Palaeo-Agulhas Plain: a lost world and extinct ecosystem PY - 2020 RN - archaeology SN - 0277-3791 SP - 105850 JO - Quaternary Science Reviews TI - The chronological, sedimentary and environmental context for the archaeological deposits at Blombos Cave, South Africa UR - http://www.sciencedirect.com/science/article/pii/S0277379119303130 VL - 235 ID - 113 ER - TY - JOUR AB - The Willandra Lakes region sits on the southern margin of Australia’s arid core and is one of the oldest localities on the continent known to have been occupied by Australia’s First People. The archaeological traces that accumulated in the Lake Mungo lunette paint a picture of changing land use over the past ∼50 thousand years (ka) and some of these are likely to have been responses to changes in palaeoenvironmental conditions. This study set out to determine the finest temporal resolution that can be used to study the depositional and palaeoenvironmental history of the Lake Mungo lunette. The investigation focused on the depositional history documented within stratigraphy exposed in an eroding gully in the southern part of the lunette; Gully 10. A stratigraphic framework was developed using sedimentological and soil micromorphological analysis. This framework was then fixed in time by 56 single-grain optically stimulated luminescence (OSL) age estimates. These data sets were then combined into a Bayesian model that indicated three depositional phases: >100 ka (LU1), ∼65–33 ka (LU2–LU3), and from ∼30 to 16 ka (LU4–LU9), with the late Pleistocene and Holocene samples (LU10–11) not being modelled. Furthermore, the redating of thirteen Lower and Upper Mungo OSL samples from Bowler et al. (2003)’s study of the southern tip of the lunette yielded younger age estimates for twelve of these, bringing them into line with previously published independent age control as well as the ages presented in this study. This study provides an approach for future efforts to establish consistency in age estimation and palaeoenvironmental interpretation along the length of the lunette. AU - Jankowski, Nathan R. AU - Stern, Nicola AU - Lachlan, Terry J. AU - Jacobs, Zenobia DA - 2020/04/01/ DO - 10.1016/j.quascirev.2020.106224 PY - 2020 RN - aeolian SN - 0277-3791 SP - 106224 JO - Quaternary Science Reviews TI - A high-resolution late Quaternary depositional history and chronology for the southern portion of the Lake Mungo lunette, semi-arid Australia UR - http://www.sciencedirect.com/science/article/pii/S0277379119307449 VL - 233 ID - 68 ER - TY - JOUR AB - Variability in East Asian summer monsoon precipitation during the Holocene remains of debate. In this study, we use a closed lake with well-dated lake beach ridges located on the margin of the East Asian summer monsoon, a region highly sensitive to monsoon precipitation changes, to obtain a temporal sequence of water volume in North China. The elevation of each beach ridge calibrated to the modern lake level was surveyed. Optically stimulated luminescence dating of undisturbed sediments of beach ridges was performed. The lake area and water volume corresponding to each beach ridge were calculated using a digital elevation model. This study reveals relatively reduced monsoon precipitation from ~12 to 7?ka interrupted by strengthening of the monsoon circulation to a maximum from ~7 to ~5?ka and followed by greatly reduced monsoon intensity until the present day. These results demonstrate that changes in the East Asian summer monsoon precipitation may not be directly driven by global temperature or atmospheric CO2 content. Rather, we suggest that variation in the the monsoon margin precipitation is probably mainly driven by ice volume and subordinately by the summer solar insolation difference between mid-latitude land and low-latitude ocean. AU - Jiang, Mengyao AU - Han, Zhiyong AU - Li, Xusheng AU - Wang, Yong AU - Stevens, Thomas AU - Cheng, Jun AU - Lv, Cunjuan AU - Zhou, Yuwen AU - Yang, Qianqian AU - Xu, Zhiwei AU - Yi, Shuangwen AU - Lu, Huayu DA - 2020/07/01 DO - 10.1002/jqs.3195 KW - beach ridge Dali Lake Holocene lake water volume optically stimulated luminescence (OSL) IS - 5 PY - 2020 RN - lacustrine SN - 0267-8179 SP - 716-725 JO - Journal of Quaternary Science TI - Beach ridges of Dali Lake in Inner Mongolia reveal precipitation variation during the Holocene UR - https://doi.org/10.1002/jqs.3195 VL - 35 Y2 - 2020/06/29 ID - 136 ER - TY - JOUR AB - Coastal dunes are a common geomorphic type in sandy coastal zones. They are a record of the coupled evolutionary processes of the wind and ocean waves. Many coastal dune fields have developed on the east coast of Fujian China and now occur as widespread typical coastal aeolian sand landforms on the Liuao Peninsula, Gulei Peninsula and Dongshan Island, but it is difficult to evaluate the dynamic geomorphologic process of sandy coast due to the lack of systematic and accurate chronological data. In this study, we selected the Hutoushan (HTS) aeolian dune on the Liuao Peninsula as the research object. Optical dating and grain-size analysis were applied to sand samples from the aeolian sequence of a profile of the HTS dune. The results show that the ages of seven samples of this profile were in the range of 37.8–0.19 ka from 4.0 to 0.2 m deep. These correspond to the Marine Isotope Stage 3 (MIS3), abrupt climatic change events of 4.2 and 1.1 ka and the Little Ice Age (LIA), respectively. These samples displayed evidence of a longer-term climate trend in this area. The period of formation of this coastal aeolian dune corresponds to a cold and arid climate associated with the East Asia Winter Monsoon (EAWM). Periods of dune fixation and rubification are evidence of a hot and humid climate. Mobilization and stabilization of the aeolian dune is an important characteristic of the coastal evolution in South China since the late Pleistocene. AU - Jin, Jian-hui AU - Li, Zhi-zhong AU - Ling, Zhi-yong AU - Zheng, Fei AU - Xu, Xiao-lin AU - Cheng, Yan AU - Cao, Xiang-dong AU - Li, Zhi-xing AU - Zhang, Wen-jing AU - Ren, Yong-qing DA - 2019/12/01 DO - 10.1007/s11629-019-5551-3 IS - 12 PY - 2019 RN - coastal aeolian SN - 1993-0321 SP - 2754-2769 JO - Journal of Mountain Science TI - Chronology of coastal aeolian deposition and its paleoenvironmental implications on the Liuao Peninsula of South China UR - https://doi.org/10.1007/s11629-019-5551-3 VL - 16 ID - 2 ER - TY - JOUR AB - In the linear modulation (LM) technique of optically stimulated luminescence (OSL), the stimulation power changes with a linear ramping rate, while the signal intensity starts to increase from background level and continues by forming peaks. In some cases as in the present study, the LM-OSL curve has a non-conventional shape with a strongly decaying signal at the beginning of the stimulation. In order to deal with this dominant decaying component, two different deconvolution approaches were used by adding to the initial part of the LM-OSL curves, besides the conventional LM-OSL components, (a) a phosphorescence (PH) decaying component and (b) a continuous wave (CW) - OSL decaying component . The fitting results showed that temperature dependences of the fitting parameters (τ and σ) contradict standard OSL theory, so the non-conventional dominant decay component is not another CW-OSL. This non-conventional component could be attributed to an intense optically stimulated phosphorescence (OSP) component, due to the experimentally verified stimulated temperature dependence of the decay coefficient λ. This signal is much more intense at stimulation temperatures 125 °C and below, with various arguments suggesting that at these temperatures the signal originates from the 110 °C TL trap. AU - Kaya-Keleş, Şule AU - Polymeris, George S. AU - Perçinler, Burak AU - Meriç, Niyazi DA - 2020/04/01/ DO - 10.1016/j.jlumin.2020.117026 KW - Phosphorescence Continuous wave optically stimulated luminescence Linear modulation Optically stimulated phoshorescence Decay curve PY - 2020 RN - basic research SN - 0022-2313 SP - 117026 JO - Journal of Luminescence TI - Dealing with non-conventional LM-OSL curve shapes in quartz following bleaching; a deconvolution approach UR - http://www.sciencedirect.com/science/article/pii/S0022231319317375 VL - 220 ID - 22 ER - TY - JOUR AB - The present comment concerns the correct presentation of the equations giving the CW-OSL intensity in the case of second- and general-order kinetics. Those equations have also been published with their wrong formulation in two eminent books in their topic. Since most researchers (especially early stage) would use directly the proposed functions as published in the various sources, they should be notified of their correct formulation. AU - Kazakis, Nikolaos A DO - 10.1093/rpd/ncy281 IS - 1 PY - 2019 RN - basic research SN - 0144-8420 SP - 131-134 JO - Radiation Protection Dosimetry TI - Comment on the paper ‘luminescence models by S.W.S. Mckeever and R. Chen, Radiation Measurements 27(5/6), 1997, pp. 625–661’ UR - https://doi.org/10.1093/rpd/ncy281 VL - 185 Y2 - 12/18/2019 ID - 4 ER - TY - JOUR AB - The present work explores the luminescence behavior of animal bones and more specifically, chicken bones, using OSL in order to investigate whether they can be used for the dose assessment in the case of an accident or as dosimeters at the post-sterilization dosimetry of foods. Results indicate that the OSL sensitivity is rather low and the lower detection limit is ~18 Gy eliminating the possibility of using bones as emergency dosimeter. However, the OSL dose response is linear for doses up to ~1.0 kGy, while response over the entire dose range, up to several kGy, can be fitted with an exponential saturation curve. When bones are kept in dark, half of the initial OSL signal is lost seven days after irradiation, with no further loss for longer time periods up to two months post-irradiation. Since bones are heat-sensitive and exhibit sensitization, a dose recovery test was also conducted using the SARHS protocol in order to investigate if the protocol is capable of calculating the sterilization/accidental dose of irradiated chicken/poultry. The “unknown” doses were successfully recovered even when fading was considered. Considering the fact that bones are not directly exposed to light (protected by the skin and the flesh) or to high temperatures, it seems that they could be used at retrospective dosimetry and the identification of irradiated food products containing bone (food post-sterilization dosimetry). AU - Kazakis, Nikolaos A. AU - Tsirliganis, Nestor C. DA - 2019/12/01/ DO - 10.1016/j.apradiso.2019.108899 KW - Chicken Bones Hydroxyapatite Retrospective dosimetry Post-sterilization dosimetry Optically stimulated luminescence PY - 2019 RN - dosimetry SN - 0969-8043 SP - 108899 JO - Applied Radiation and Isotopes TI - Optically stimulated luminescence investigation of chicken bones towards their use at food post-sterilization and retrospective dosimetry UR - http://www.sciencedirect.com/science/article/pii/S0969804319307912 VL - 154 ID - 161 ER - TY - JOUR AB - Records of Australian climate during Marine Isotope Stages 5 and 7 (130–71 and 243–191 ka) are rare, preventing detailed assessments of long-term climate, drivers and ecological responses across the continent over glacial-interglacial timescales. This study presents a geochemistry-based palaeoclimate record from Fern Gully Lagoon on North Stradbroke Island (also known as Minjerribah) in subtropical eastern Australia, which records climates in MIS 7a–c, MIS 5 and much of the Holocene, in addition to MIS 4 (71–57 ka), and parts of MIS 6, MIS 3 and MIS 2 (191–130, 57–29 and 29–14 ka). Indicators of inorganic sedimentation from a 9.5 m sediment core – focussed on high-resolution estimates of sediment geochemistry supported by x-radiography, inorganic content and magnetic susceptibility – were combined with a chronology consisting of six radiocarbon (14C) and thirteen single-grain optically stimulated luminescence (OSL) ages. Hiatuses occurred at ~178–153 ka, ~36–21 ka and ~7–2 ka and likely result from the wetland drying. Low values of locally sourced aeolian materials indicate a wet MIS 7a–c and early MIS 6 before a relatively dry MIS 5. Inorganic flux during the Holocene was up to four times greater than during MIS 5, consistent with long-term interglacial drying observed in other regions, most notably in central Australia. This study highlights the importance of employing a combination of multiple dating approaches and calibrated geochemical proxies to derive climate reconstructions and to identify depositional complexities in organic-rich wetland records. AU - Kemp, C. W. AU - Tibby, J. AU - Arnold, L. J. AU - Barr, C. AU - Gadd, P. S. AU - Marshall, J. C. AU - McGregor, G. B. AU - Jacobsen, G. E. DA - 2020/01/15/ DO - 10.1016/j.palaeo.2019.109463 KW - Palaeoclimate North Stradbroke Island Holocene MIS 5 MIS 7 μXRF PY - 2020 RN - lacustrine SN - 0031-0182 SP - 109463 JO - Palaeogeography, Palaeoclimatology, Palaeoecology TI - Climates of the last three interglacials in subtropical eastern Australia inferred from wetland sediment geochemistry UR - http://www.sciencedirect.com/science/article/pii/S0031018219307503 VL - 538 ID - 17 ER - TY - JOUR AB - Localized energy levels within the forbidden energy band are the source of various stimulated luminescence phenomena. The present study deals with the case of electrons stimulated from localized levels and recombining with a hole at a luminescence center, without the mediation of the conduction band. Previous research was based on three different assumptions as follows. Firstly, it was assumed that the recombination rate is independent of the concentration of recombination centers, and is proportional only to the concentration of electrons in the excited state of the trap. Secondly, it is assumed that the principle of detailed balance holds for these localized transitions. A third common assumption is that the system is in quasi-equilibrium condition. When these three conditions are applied to the system of differential equations describing the localized transitions, it was shown that the resultant thermoluminescence (TL) signals follow first order kinetics. This paper examines the assumptions used in these previous studies, and extensive simulations are carried out for a wide range of parameters in the localized transitions model. The results of the simulations show that the TL peaks in the localized model have very similar characteristics with TL peaks derived from delocalized models, including non-first order kinetic characteristics. The differential equations describing the localized transition model are solved analytically using the Lambert W function, and the resulting analytical master equation can describe a variety of optically and thermally stimulated phenomena. AU - Kitis, George AU - Pagonis, Vasilis DA - 2018/10/01/ DO - 10.1016/j.nimb.2018.06.029 KW - Thermoluminescence Localized transitions Model TL dosimetry Stimulated luminescence Lambert function PY - 2018 RN - basic research SN - 0168-583X SP - 13-19 JO - Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms TI - Localized transition models in luminescence: A reappraisal UR - http://www.sciencedirect.com/science/article/pii/S0168583X18304129 VL - 432 ID - 5 ER - TY - JOUR AB - This paper reviews developments in phenomenological models of stimulated luminescence phenomena. A set of five master equations is presented, which describe a wide variety of stimulated luminescence signals: thermoluminescence, isothermal luminescence, optically stimulated luminescence and infrared stimulated luminescence. Both delocalized and localized models are reviewed, and analytical solutions are presented for these models. The master equations are tested against the solutions of the differential equations in the models, as well by fitting experimental data for a variety of luminescencent dosimetric materials. Three out of the five master equations involve the Lambert W(z) function, thus establishing this function as the theoretical cornerstone of the phenomenological luminescence models. The applicability of the superposition principle is discussed, in connection with computerized curve deconvolution analysis. AU - Kitis, George AU - Polymeris, George S. AU - Pagonis, Vasilis DA - 2019/11/01/ DO - 10.1016/j.apradiso.2019.05.041 KW - Thermoluminescence Optically stimulated luminescence Infra Red stimulated luminescence Radiation dosimetry Dating Glow curve analysis PY - 2019 RN - basic research SN - 0969-8043 SP - 108797 JO - Applied Radiation and Isotopes TI - Stimulated luminescence emission: From phenomenological models to master analytical equations UR - http://www.sciencedirect.com/science/article/pii/S0969804319304142 VL - 153 ID - 160 ER - TY - JOUR AB - Accurate calibration of dose rate during laboratory irradiations of the aliquots using a 90Sr/90Y beta source mounted on the reader system is a key factor in luminescence dating of geological samples. The Z-dependent backscatter and build up effects are the major concerns which result into variation in apparent dose rate from aliquot to aliquot. Recently it has been proposed that there may be a practical advantage in using a high Z substrate because of the higher dose rate. In this regard, the author would like to add that use of high Z substrates may not be of much use although they facilitate higher dose rates due to beta backscattering and bremsstrahlung production. Since the typical radioactivity of 90Sr/90Y source in RISO readers is ~(10-50) mCi or so, the bremsstrahlung radiation associated with higher Z substrates/cups may be substantial and leads to large errors because over-response corrections are generally not included while establishing standardization and calibrating the beta doses. In view of this, it is recommended that while performing beta irradiations in RISO readers, the low Z substrates like Al (Z ≤13) may be preferred over high Z substrates like stainless steel or platinum, so as to minimize the bremsstrahlung contribution. The use of low Z substrates like Al also does not pose any serious operational problems while recording OSL or TL except at higher temperatures preferably above 500oC. AU - Kumar, Munish DA - 2019/07/01/ DO - 10.1016/j.radmeas.2019.106137 PY - 2019 RN - basic research SN - 1350-4487 SP - 106137 JO - Radiation Measurements TI - Further considerations on “Towards the origins of over-dispersion in beta source calibration” by Hansen et al., radiation measurements, 2018 UR - http://www.sciencedirect.com/science/article/pii/S1350448718305389 VL - 126 ID - 49 ER - TY - JOUR AB - In luminescence dating of feldspar, laboratory induced luminescence necessary to assess the naturally acquired dose in the environment suffers from a poorly understood instability over time, known as anomalous fading (AF). AF is the source of commonly observed age underestimation in optical dating of feldspar. Approaches to circumvent AF include correction methods as well as attempts to measure directly an unfading component of feldspar luminescence, e.g. post-IR IRSL protocols. The former has the advantage of measuring the easily bleachable traps but requires extrapolations of fading rates. Post-IR IRSL methods can be limited by the use of more difficult-to-bleach traps and hence by potential age overestimations. In this paper, we show how post-isothermal laboratory induced luminescence (pIt-IR) allows measuring an equivalent dose (De) that is not dependent on time elapsed since irradiation. In this procedure, one measures two IRSL signals, first from an IR stimulation at low temperature (i.e. IR50) followed by a second one, at a higher temperature (i.e. IR225). Since both signals fade at different rates, De from IR50 is lower than that of IR225. In pIt-IR, a succession of thermal treatments is carried out before the measurement of laboratory-induced IR50 and IR225 luminescence. The dependence of De on thermal annealing is different for each IR signal so one can find which thermal treatment will yield the same De for both signals. This De is assumed to be the true total radiation dose received by the feldspar minerals in nature, more properly known as the paleodose (P). This new methodology is herein applied to three samples of different ages and different geological contexts. Post-isothermal luminescence is thus proposed as a way to circumvent AF, even though extended isothermal annealing treatment is not shown to eradicate AF. AU - Lamothe, Michel AU - Forget Brisson, Laurence AU - Hardy, François DA - 2020/04/01/ DO - 10.1016/j.quageo.2020.101062 PY - 2020 RN - basic research SN - 1871-1014 SP - 101062 JO - Quaternary Geochronology TI - Circumvention of anomalous fading in feldspar luminescence dating using Post-Isothermal IRSL UR - http://www.sciencedirect.com/science/article/pii/S187110142030011X VL - 57 ID - 56 ER - TY - JOUR AB - The site of Uichteritz (Saxony-Anhalt, Germany) is a Quaternary gravel quarry hosting several Middle-Pleistocene fluvial units of the Saale River. This fluvial archive contains detailed information on (1) the timing of Middle Pleistocene fluvial aggradation and erosion periods in the region, (2) the driving forces for those alternations, as well as (3) early human presence indicated by the presence of Lower Paleolithic stone artefacts. Here we establish a luminescence-based numerical chronology at Uichteritz. Additionally, geophysical, sedimentological and micromorphological analyses were applied to obtain information on depositional and post-depositional processes of the fluvial sequence. Our results point to several fluvial aggradation periods between ca. 420 and 180 ka. A first fluvial unit was deposited during the late Elsterian period, followed by formation of a Luvisol during MIS 11 and its fluvial reworking at the transition from MIS 11 to MIS 10 and/or during early MIS 10. These MIS 10/11 deposits, with an age of about 400 ka, also contain reworked Lower Paleolithic stone artefacts that document the initial appearance of humans in northwestern central Europe during MIS 11. After a period of fluvial incision during MIS 10, which was accompanied by a change in the course of the Saale River, several stacked fluvial sequences of the Saalian Main Terrace (SMT) formed between MIS 8 and MIS 6, mainly during cold climatic periods. Our age estimates confirm the correlation of the Elsterian ice advances with MIS 12, and the Saalian ice advances with later MIS 6. AU - Lauer, Tobias AU - Weiss, Marcel AU - Bernhardt, Wolfgang AU - Heinrich, Susann AU - Rappsilber, Ivo AU - Stahlschmidt, Mareike C. AU - von Suchodoletz, Hans AU - Wansa, Stefan DA - 2020/04/01/ DO - 10.1016/j.geomorph.2019.107016 KW - Pleistocene Interglacial Glaciation Paleogeography Europe Luminescence dating Micromorphology PY - 2020 RN - archaeology fluvial SN - 0169-555X SP - 107016 JO - Geomorphology TI - The Middle Pleistocene fluvial sequence at Uichteritz, central Germany: Chronological framework, paleoenvironmental history and early human presence during MIS 11 UR - http://www.sciencedirect.com/science/article/pii/S0169555X19305070 VL - 354 ID - 62 ER - TY - JOUR AB - Terrestrial sedimentary archives that record environmental responses to climate over the last glacial cycle are underrepresented in subtropical Australia. Limited spatial and temporal palaeoenvironmental record coverage across large parts of eastern Australia contribute to uncertainty regarding the relationship between long-term climate change and palaeoecological turnover; including the extinction of Australian megafauna during the late Pleistocene. This study presents a new, high-resolution, calibrated geochemical record and numerical dating framework from Welsby Lagoon, a wetland from North Stradbroke Island that records key periods of late Pleistocene environmental change. Single-grain optically stimulated luminescence and radiocarbon dating are integrated into a Bayesian age-depth model for the sedimentary sequence spanning Marine Isotope Stage (MIS) 5 to the present. Scanning micro X-ray fluorescence (XRF) and bulk sediment XRF assays are used to infer past dust dynamics, with changes in the abundance of silica and potassium interpreted as proxies for aridity across local and regional sources. Variations in dust flux were contemporaneous with hydrological change, concordant with changes in vegetation cover on the island and, relate to deflation events at major dust source regions on the Australian continent. The Welsby Lagoon record supports the notion of a variable MIS4 within which an increased dust flux (71–67 ka), may be indicative of drier climate. Additionally, the record also shows a lower dust flux through the Last Glacial Maximum (LGM) than is evident in other Australian aeolian records. However, this low LGM flux is attributed to the wetland’s evolution, rather than a reduction in total dust flux. AU - Lewis, Richard J. AU - Tibby, John AU - Arnold, Lee J. AU - Barr, Cameron AU - Marshall, Jonathan AU - McGregor, Glenn AU - Gadd, Patricia AU - Yokoyama, Yusuke DA - 2020/04/15/ DO - 10.1016/j.quascirev.2020.106262 KW - Quaternary Palaeolimnology Geochronology Australia Aeolian deposition Optically stimulated luminescence dating Optical methods Last glacial maximum Dust PY - 2020 RN - coastal SN - 0277-3791 SP - 106262 JO - Quaternary Science Reviews TI - Insights into subtropical Australian aridity from Welsby Lagoon, north Stradbroke Island, over the past 80,000 years UR - http://www.sciencedirect.com/science/article/pii/S0277379119307607 VL - 234 ID - 80 ER - TY - JOUR AB - In optical dating, equivalent dose (De) values for a sample are commonly obtained from measurement of the luminescence signals of individual mineral grains or aliquots and projection of the natural signals onto the corresponding regenerative-dose response curves. A final De estimate is calculated by using a statistical model to combine the individual De values. This method can be problematic for samples that contain large numbers of ‘saturated’ grains, which may result in underestimation of the final De value due to truncation of the full De distribution at high doses. To circumvent this problem, Li et al. (2017) proposed a new method—the so-called LnTn method—in which the re-normalised sensitivity-corrected natural signals (Ln/Tn) are analysed for all measured grains from a particular sample, and the weighted mean re-normalised Ln/Tn value is projected onto a standardised growth curve to estimate the final sample De. As no grains or aliquots are rejected because they are ‘saturated’, a full (untruncated) distribution of re-normalised Ln/Tn ratios is obtained. In this study, we use numerical simulations of ‘samples’ with a variety of assigned burial dose (palaeodose) distributions to systematically investigate the shape of the resulting Ln/Tn distributions. We test application of the central age, minimum age and finite mixture models to Ln/Tn ratios (rather than to De values) for well-bleached, insufficiently bleached and post-depositionally mixed samples. Our results show that application of statistical models to Ln/Tn ratios from single grains or aliquots is reliable, and that the LnTn method can be used to date samples with De values up to 4 times the characteristic saturation dose (D0), which is well above the conservative upper limit of 2D0. AU - Li, Bo AU - Jacobs, Zenobia AU - Roberts, Richard G. DA - 2020/06/01/ DO - 10.1016/j.quageo.2020.101066 KW - Standardised growth curves L/T ratios Truncated D distributions D values Age models PY - 2020 RN - basic research SN - 1871-1014 SP - 101066 JO - Quaternary Geochronology TI - Validation of the LnTn method for De determination in optical dating of K-feldspar and quartz UR - http://www.sciencedirect.com/science/article/pii/S1871101420300157 VL - 58 ID - 150 ER - TY - JOUR AB - East Asian summer monsoon (EASM) variability is primarily responsible for climate change in East Asia, influencing over a billion lives. The pattern and mechanisms of EASM change during the Holocene are intensely debated. In this study, we produce a high-quality age-depth model for a 11.7 m lacustrine record (CG18B core) from central Chagan Nur (a closed-basin lake located on the southern Mongolia plateau at the fringe of the modern EASM region) using 27 radiocarbon dates on organic materials and 10 quartz optically stimulated luminescence (OSL) ages on the lake sediments. Multiple-proxy analyses of pollen, grain size, total organic content, and CaCO3 content are used to reconstruct Holocene monsoonal precipitation change in the region. Reconstructed Chagan Nur level changes during the Holocene are based on 18 quartz OSL ages from well-preserved paleolake shorelines at different elevations on the northwestern basin margin. A combination of the lacustrine pollen records and a paleohydrology lake level change model is used to define quantitative precipitation change at the fringe of the EASM dominated region during the Holocene. Our results show that a lake highstand of 15-12 m higher than present occurred at 11–5 ka, followed by a decrease in lake levels to 8-7 m higher than present at 4–3 ka, and a general lake lowering during the late Holocene. EASM dominated annual precipitation varied between 420 mm and 280 mm during the Holocene period in the basin, indicating a generally semi-arid environment on the southern Mongolian Plateau, and corresponding to prevailing open steppe vegetation in the basin throughout the Holocene. EASM precipitation intensity increased from the early Holocene to the beginning of the mid-Holocene, with a maximum precipitation 30–50% higher than present at 8–6 ka, followed by a decrease in precipitation during the late Holocene. EASM precipitation shown in these records lags northern Hemisphere solar insolation shifts by ∼3 ka, indicating that variation in EASM intensity did not respond directly to northern Hemisphere summer insolation, but rather was likely modulated by high latitude forcing of ice volume and greenhouse gases. AU - Li, Guoqiang AU - Wang, Zhong AU - Zhao, Wenwei AU - Jin, Ming AU - Wang, Xiaoyan AU - Tao, Shuxian AU - Chen, Chunzhu AU - Cao, Xianyong AU - Zhang, Yunian AU - Yang, He AU - Madsen, David DA - 2020/07/01/ DO - 10.1016/j.quascirev.2020.106365 KW - Asian summer monsoon Quantitative precipitation reconstruction Lake records Luminescence dating Holocene Northern China PY - 2020 RN - lacustrine SN - 0277-3791 SP - 106365 JO - Quaternary Science Reviews TI - Quantitative precipitation reconstructions from Chagan Nur revealed lag response of East Asian summer monsoon precipitation to summer insolation during the Holocene in arid northern China UR - http://www.sciencedirect.com/science/article/pii/S0277379120303279 VL - 239 ID - 143 ER - TY - JOUR AB - Desertification is of pressing environmental concern in large parts of Asia and directly affects millions of people. Arid Central Asia (ACA) in particular is highly sensitive to desertification and environmental change. Climate change in ACA may be driven by westerly circulation or monsoon variation. However, no consensus exists over their relative importance during the Quaternary and this greatly restricts our understanding of how this region may be affected by future climate change. Here we use the most detailed luminescence dating age model yet produced for ACA for three loess records in the Tianshan Mountains spanning the past 250 ka to show a sharp dichotomy in moisture variation between lowland and high mountain areas. The lowland areas of ACA are subjected to persistent aridity during past 250 ka, while highland areas clearly show dry-glacial and moist-interglacial changes, synchronous to moisture variability in monsoonal East Asia, and both co-varying with global ice volume and greenhouse gas (GHG) variation. In contrast, moisture variability across ACA within interglacials varies inversely with insolation-driven precessional changes. This is directly out of phase with the moisture changes of East Asia, which co-vary with precessional insolation changes, and indicates the influence of Westerly circulation in ACA. Our Flexible Global Ocean-Atmosphere-Land System model simulations further reveal that coupled ice volume and GHG variations dominated climatic variability in both ACA and East Asia over glacial-interglacial cycles. However, the out of phase relationship between the intensity of the Westerly and East Asian monsoon systems during interglacial periods indicates that precessional forcing is responsible for differences in moisture patterns between ACA and East Asia. These observations indicate that moisture levels will not increase even in high altitude regions of ACA over the next several millennia; rather desertification is likely to worsen resulting from stabilization of the Westerlies as a result of low summer insolation. AU - Li, Guoqiang AU - Yang, He AU - Stevens, Thomas AU - Zhang, Xiaojian AU - Zhang, Haixia AU - Wei, Haitao AU - Zheng, Weipeng AU - Li, Lijuan AU - Liu, Xiangjun AU - Chen, Jianhui AU - Xia, Dunsheng AU - Oldknow, Chris AU - Ye, Wei AU - Chen, Fahu DA - 2020/01/15/ DO - 10.1016/j.epsl.2019.115901 KW - arid central Asia luminescence dating loess climatic changes Tianshan Mountains glacial-interglacial cycles, interglacial PY - 2020 RN - loess SN - 0012-821X SP - 115901 JO - Earth and Planetary Science Letters TI - Differential ice volume and orbital modulation of Quaternary moisture patterns between Central and East Asia UR - http://www.sciencedirect.com/science/article/pii/S0012821X1930593X VL - 530 ID - 82 ER - TY - JOUR AB - The variability and interaction of the East Asian summer monsoon (EASM) and mid-latitude Westerlies have dominated Eurasian hydroclimates over orbital timescales and currently influence over a billion lives in Asia. Despite this, the mechanisms influencing EASM-Westerlies variability are still a matter of considerable debate. This study presents three loess-paleosol sequences in the NE Tibetan Plateau (NETP) dated at high-resolution by 50 K-feldspar pIRIR and 37 quartz OSL ages to produce the most detailed chronology for any loess record within the plateau. Combined with this chronology are sedimentology, magnetic susceptibility and grain size analyses with TraCE-21ka climatic modelling to constrain atmospheric controls on climatic changes over the NETP during the past 130 kyr. Our results indicate that deposition initiated by ∼130 ka with especially rapid rates during glacial periods, with maximum rates (140–180 g/cm2/ka) in early MIS 2. Over interglacial-glacial cycles, NETP climatic changes are consistent with warm-moist interglacial and cold-dry glacial conditions recorded in the monsoonal Chinese Loess Plateau and Westerlies-dominated Central Asia but anti-phase to Central Asia during interglacial and the Holocene substages. These results highlight how variation in EASM intensity strongly controls NETP moisture changes but that Holocene and last interglacial changes recorded in the NETP consistently lag 30°N summer insolation by 2–6 kyr. This study suggests high-latitude forcing effectively modulates EASM intensity and that factors such as ice volume, greenhouse gases, and freshwater input to northern Atlantic and Southern oceans critically influence NETP paleoclimatic conditions. AU - Li, Guoqiang AU - Zhang, Haixia AU - Liu, Xiangjun AU - Yang, He AU - Wang, Xiaoyan AU - Zhang, Xiaojian AU - Jonell, Tara N. AU - Zhang, Yunian AU - Huang, Xin AU - Wang, Zhong AU - Yixuan, Wang AU - Yu, Lupeng AU - Xia, Dunsheng DA - 2020/06/01/ DO - 10.1016/j.quascirev.2020.106283 KW - East asian summer monsoon Tibetan plateau Loess Paleosol Luminescence dating Climate change Interglacial PY - 2020 RN - loess SN - 0277-3791 SP - 106283 JO - Quaternary Science Reviews TI - Paleoclimatic changes and modulation of East Asian summer monsoon by high-latitude forcing over the last 130,000 years as revealed by independently dated loess-paleosol sequences on the NE Tibetan Plateau UR - http://www.sciencedirect.com/science/article/pii/S0277379120302456 VL - 237 ID - 140 ER - TY - JOUR AB - The Cenozoic tectonic deformation in the Madong Shan, especially since the Holocene, is the key to understand stress transfer at the southeastern terminus of the Haiyuan Fault, northeastern Tibetan Plateau. In this work, we explored the uplift pattern of the Madong Shan by combining the form of bedrock channel and river incision rate. The normalized channel steepness (ksn) and wideness (kwn) indices provided two comparable channel morphologic parameters. To evaluate the differences among the rock uplift, river incision rates were determined by optical stimulated luminescence (OSL) dating of the strath terraces along two rivers. The results show that channels in the northern Madong Shan are relatively steeper and narrower, and have the higher shear stress to incise than those in the south. The incision rates in the northern channels were two times higher than those in the southern channels since the late Holocene. The major changes of channel morphometry and incision rates are coinciding spatially with the stress transfer direction along the Haiyuan Fault, rather than the lithologic variations. Therefore, we speculate that the differential bedrock channel form and river incision were mainly controlled by variable tectonic uplift across the Madong Shan with secondary contribution of the lithology. Deformation of the Madong Shan has been continuously driven by the strain transfer along the Haiyuan Fault. AU - Li, Xuemei AU - Zhang, Huiping AU - Su, Qi DA - 2019/09/01/ DO - 10.1016/j.jseaes.2019.103896 KW - Madong Shan NE Tibet Geomorphology Channel form Tectonics PY - 2019 RN - fluvial earthquake (and fault related) SN - 1367-9120 SP - 103896 JO - Journal of Asian Earth Sciences TI - Bedrock channel form in the Madong Shan (NE Tibet): Implications for the strain transfer along the strike-slip Haiyuan Fault UR - http://www.sciencedirect.com/science/article/pii/S1367912019302482 VL - 181 ID - 121 ER - TY - JOUR AB - Three phases of transgression have been identified in the Middle to Late Pleistocene sedimentary succession in the Bohai Sea, northern China, which is considered to be key information for understanding environmental evolution and marine-terrestrial interaction in the East Asia. However, the timing of these transgressions still remains controversial. In this study, luminescence dating was performed on a core drilled in the North Bohai Coast to establish a reliable chronological framework of the transgression-regression cycles. After validating the applicability of luminescence dating for the Bohai sediments, quartz optically stimulated luminescence (OSL) and K-feldspar post-infrared (IR) IRSL (pIRIR) signals with elevated temperatures at 150, 225 and 290 °C were employed for dating the sediment core. The quartz OSL signal used for the upper 25 m of the sediment core was well-bleached, yielding finite ages within ca. 50 ka, whilst the K-feldspar pIRIR225 signal was also well-bleached for the Pleistocene samples with an extended dating limit to ca. 300 ka. The luminescence ages of ca. 200 ka and ca. 7.0–0.2 ka indicated that the lowermost and uppermost of three transgression units likely represent sea-level highstand during Marine Isotope Stages (MIS) 7 and 1, respectively, which were also evidenced by the consistency between the reconstructed palaeo-topography elevation and the contemporaneous global mean sea-level. Our luminescence ages of the second transgressive unit suggest it has a MIS 3 origin, being consistent with previous studies, but this appears to be unlikely as the level of the unit is significantly above the interstadial sea-level in the MIS 3. Further high-resolution luminescence dating of the second transgression is thus required. AU - Li, Yan AU - Tsukamoto, Sumiko AU - Shang, Zhiwen AU - Tamura, Toru AU - Wang, Hong AU - Frechen, Manfred DA - 2019/10/01/ DO - 10.1016/j.margeo.2019.105980 KW - Transgression Sea-level change Luminescence dating Signal bleaching Anomalous fading Bohai Sea PY - 2019 RN - coastal SN - 0025-3227 SP - 105980 JO - Marine Geology TI - Constraining the transgression history in the Bohai Coast China since the Middle Pleistocene by luminescence dating UR - http://www.sciencedirect.com/science/article/pii/S0025322719300064 VL - 416 ID - 124 ER - TY - JOUR AB - The Western Hubei section of the Liangyun fault is an important structural belt of the southern Qinling Mountains thrust nappe system. As the significant activity of the Liangyun fault since the Quaternary has led to high seismic risk in the surrounding area, the research on the characteristics and activity of fault structure is of great significance for deepening the construction of a seismic safety system in this area. In this study, we conducted a field geology survey combined with quartz optical stimulated luminescence dating, scanning electron microscopy dating, and thermoluminescence dating results and comprehensive application of shallow seismic reflection and high-resolution refraction) to analyze the activities of the Liangyun fault in the Quaternary period. Sediment optical stimulated luminescence dating results of samples from the breakpoint were 134.99 + 15.52 and 160.95 + 16.88 ka. Combined with the seismic profile, outcrop observation, and previous dating results, we conclude that the new era is in fault activities in the early Pleistocene to late Pleistocene (Q2–Q3). The combined application of shallow seismic reflection and high-resolution refraction method can confirm each other’s measured results, providing more parameters for the interpretation of seismic data under complex conditions and ensuring the accuracy of data interpretation at the same time. At present, the seismic experiment scheme is less used in the field of active fault detection, since its good detection effect and the application of the trial to shallow geophysical exploration has a certain application value and global scalability. AU - Lin, Song AU - Li, Yuan AU - Luo, Denggui AU - Fu, Yanlin DA - 2020/01/01 DO - 10.1139/cjes-2018-0118 IS - 1 PY - 2019 RN - earthquake (and fault related) SN - 0008-4077 SP - 1-15 JO - Canadian Journal of Earth Sciences TI - Research on the fracture structure and activity of the Qinling Mountains thrust nappe system in western Hubei UR - https://doi.org/10.1139/cjes-2018-0118 VL - 57 Y2 - 2020/07/06 ID - 171 ER - TY - JOUR AB - Eolian sediments, an important paleoenvironmental archive, are widespread in the Yarlung Tsangpo River (YTR) valley of the southern Tibetan Plateau (TP), but their chronology and spatial-temporal differentiation are poorly understood. And it is not clear whether eolian accumulation is controlled by global climate changes, or local paleoenvironment, or both. In this study, we applied quartz OSL dating to 30 eolian sediment samples (sandy loess and eolian sand) from eight profiles in the YTR catchment. Our new dates were combined with 72 previously published eolian sediment ages (OSL/TL and 14C) for the YTR catchment to analyze the response of eolian accumulation to paleoenvironmental changes. The overall dataset has eolian accumulation spanning the period from the Last Interglacial through to the Little Ice Age, ranging from 84.6 ± 8.7 ka BP (possibly as old as 118 ± 11 ka BP) to 0.4 ± 0.1 ka BP, with most occurring since the Late Glacial Period (15 ka BP), which suggests that the preservation of eolian deposits is controlled by geologic recirculation. Probability density function distributions (PDFs) of eolian ages from different parts of the YTR catchment show different age clusters, suggesting that factors controlling eolian accumulation vary across the catchment, so that spatial-temporal disparities are inherent in the system. To investigate the effect of regional and global paleoclimate since the Last Glacial Maximum (LGM) on eolian deposition processes in the YTR, we compared the PDF of ages from the combined dataset with a range of paleoclimate proxies. The PDF shows significant fluctuations since the LGM, including the Younger Dryas cold event. There is no consistent eolian sediment response to changes of the 30°N summer insolation, Asian Summer Monsoon, and westerlies. Phases of strong eolian sediment accumulation in the YTR basin do not show a simple correspondence with the classical global climate curve, suggesting that eolian processes in the alpine valley environment may be modified by local responses to these changes. AU - Ling, Zhiyong AU - Yang, Shengli AU - Wang, Xin AU - Wang, Jianping AU - Xia, Dunsheng AU - Chen, Fahu DA - 2020/05/15/ DO - 10.1016/j.geomorph.2020.107104 KW - Eolian sediments Quartz luminescence dating Spatial-temporal differentiation Paleoenvironment Yarlung Tsangpo valley PY - 2020 RN - aeolian lacustrine SN - 0169-555X SP - 107104 JO - Geomorphology TI - Spatial-temporal differentiation of eolian sediments in the Yarlung Tsangpo catchment, Tibetan Plateau, and response to global climate change since the Last Glaciation UR - http://www.sciencedirect.com/science/article/pii/S0169555X20300763 VL - 357 ID - 71 ER - TY - JOUR AB - OSL dating of a stone built structure directly on the south of the Geometric period settlement of Zagora (Andros island, Aegean sea, Greece) was conducted to determine whether a minor access point to the site was ancient. Double single aliquot regeneration (SAR) protocol was recorded for total dose De calculation, in which samples were first stimulated with IR and the post IR blue light stimulated luminescence (BLSL) signal from quartz grains, at 220°C preheat temperature and OSL signal recorded during 40s blue light stimulation. Alpha counting, XRD, XRF were used for radioisotope content and mineralogy assessment. The construction was found to date to the 19th century CE. AU - Liritzis, Ioannis AU - Miller, Margaret C. AU - L., Alappat. IS - 2 PY - 2020 RN - archaeology SP - 23-34 JO - Scientific Culture TI - The value of OSL in distinguishing ancient from more recent structures in an archaeological landscape UR - https://sci-cult.com/the-value-of-osl-in-distinguishing-ancient-from-more-recent-structures-in-an-archaeological-landscape/ VL - 6 ID - 126 ER - TY - JOUR AB - The Yangtze shoal lies east of the Yangtze (Changjiang) River estuary, China, at water depths of ~25–55 m and is one of the largest subaqueous, sheet-like sand banks in the world. Previous studies have not reached a consensus regarding its origin and timing of formation, mainly due to the scarcity of coring and high-resolution seismic profiling in the shoal. We recovered a 70.20-m-long sediment core (CRE-1402) through the sand shoal and acquired 1586 km of high-resolution shallow seismic profiles across the estuary and shoal. We conducted systematic analyses of the core, including its sedimentary characteristics, down-core changes in benthic foraminiferal assemblages, and 14C and optically stimulated luminescence (OSL) dating. We also analyzed the seismic stratigraphy and integrated these results with data from other previously well-studied cores onshore and offshore of the Yangtze River mouth. Our results indicate that the stratigraphic architecture in the paleo-Yangtze estuary (i.e., the area from the present-day delta plain to the subaqueous delta and Yangtze Shoal) was controlled mainly by changes in sea level during the post-glacial transgression. The post-14 ka sedimentary successions in the paleo-estuary rest unconformably on fluvial or coastal deposits that formed mainly before MIS 1, and are separated by three distinctive bounding surfaces corresponding to MWP-1A, MWP-1B (?) or the rapid sea-level rise at ca. 11.5 ka shortly after the Younger Dryas cold period, and the 8.2 ka event, respectively, and the maximum marine flooding surface (MFS). The depositional unit of the Yangtze Shoal ranges in thickness from 6 to 32 m. The shoal exhibits large-scale, SW-dipping (generally 0.5°–2°) foresets with local cross-cutting of foresets, which are composed mainly of very fine- to medium-grained sands. The shoal is underlain by muddy intertidal to subtidal flat deposits that formed during the Younger Dryas, with an erosional surface corresponding to MWP-1B (?) or the rapid sea-level rise at ca. 11.5 ka between these and the shoal deposits. The Yangtze Shoal came into being mainly between ca. 11.5 and 7.0 ka in the form of tidal sand ridges actively moving southwestwards under intense and reciprocal tidal currents on a tidal shelf. The tidal sand ridges have evolved into sheet-like tidal sand banks with relatively low relief as a result of tidal remobilization under rotary tidal currents since ca. 7.0 ka when the MFS formed. Therefore, the Yangtze Shoal can be considered to comprise quasi-active tidal sand banks. AU - Liu, Jian AU - Qiu, Jiandong AU - Saito, Yoshiki AU - Zhang, Xin AU - Nian, Xiaomei AU - Wang, Feifei AU - Xu, Gang AU - Xu, Taoyu AU - Li, Meina DA - 2020/05/01/ DO - 10.1016/j.margeo.2019.106080 KW - Yangtze Shoal Yangtze estuary Tidal sand ridges Post-glacial transgression Sea level change Meltwater pulse PY - 2020 RN - coastal SN - 0025-3227 SP - 106080 JO - Marine Geology TI - Formation of the Yangtze Shoal in response to the post-glacial transgression of the paleo-Yangtze (Changjiang) estuary, China UR - http://www.sciencedirect.com/science/article/pii/S0025322718303955 VL - 423 ID - 73 ER - TY - JOUR AB - This paper presents data on the fragments of ancient sedimentary deposits placed around the Piedade and Casa Branca streams, important right bank tributaries of the Paraopeba River. From these data, it was possible to establish a picture regarding the paleomorphology and paleodrainage of the area. The methodological steps adopted consisted of the definition of sedimentary facies, as well as the establishment of their sedimentary provenance (U/Pb method in detrital zircons) and deposition age (OSL in quartz). Through the facies analyses, it was possible to show channel facies (Gt) associated with debris flows (Gmm) and sieve deposits (Gh). In the sedimentary provenance stage, spectra of ages congruent with those found in literature for the Moeda and Cauê Formations were identified, suggesting that the Moeda mountain range is a source area. We also analyzed data on the sediments of the current bed, which indicate the same provenance, showing that the current courses constitute an embedded analog of the paleochannels. The data herein obtained corroborate the hypothesis that the eastern periphery of the Bonfim Complex was dominated by a system of alluvial fans between 9.5 ± 1 and 15.5 ± 1.6 ka before present, whose remnants are preserved on the current hilltops and mid slopes of the basement landscape. AU - Lopes, Fabrício Antonio AU - Lana, Cláudio Eduardo AU - Castro, Paulo de Tarso Amorim AU - de Carvalho Lana, Cristiano DA - 2020/03/20/ DO - 10.1016/j.quaint.2020.02.025 KW - Quaternary OSL Facies profile Alluvial fans Quadrilátero Ferrífero Sedimentary provenance PY - 2020 RN - fluvial SN - 1040-6182 SP - 30-40 JO - Quaternary International TI - Paleomorphology of the northwestern of the Quadrilátero Ferrífero (central Brazil): Stratigraphic and geochronological evidence of a pleistocene alluvial fan system UR - http://www.sciencedirect.com/science/article/pii/S1040618220300677 VL - 542 ID - 112 ER - TY - JOUR AB - River-incision rate is widely used to track changes in tectonics or climate over time and space. However, the feasibility of utilizing the spatial variations of river incision to reconstruct past tectonic and climatic processes remains unclear. Here, we focus on the spatial patterns of river incision along the northern Chinese Tian Shan foreland. Three alluvial fans FP, FeH, and FlH are determined as the alluvial fan context of river incision and terrace classification providing the geomorphological framework across the foreland region. Four rivers (i.e. the Kuitun, Jingou, Manas, and Urumqi Rivers from the western, central, and eastern part of the foreland) are used to reconstruct the paleogeomorphology from the reference, which is the best-preserved terrace of each river system with ages clustering in different parts of the Latest Pleistocene-Early Holocene. The depth of incision constrained by the reference terrace of each river is obtained by comparing the present-day topography and the reconstructed one. The resulting profile of channel incision (depth and rate) of each analyzed river displays an overall decreasing-downstream trend from the maximum where the river exits from the mountain range, to zero. Such a trend has been attributed to the progressive lowering of the river gradient that was caused by the adjusted ratio of sediment input versus water discharge induced by climate change. Superimposing on the decreasing-downstream trend, an obvious step can also easily be observed onto the profile of channel incision of each river, downstream of which channel incision is significantly less. The step occurs near the thrust fault controlling growth of the outermost anticline through which each river cuts, thereby implying the key role of local rock uplift in forming the river-incision step. The former observation implies that, at the same timescale, more river incision at the exit from the mountain range does not necessarily mean stronger climatic forcing of incision there. We thus propose that, in a foreland setting, it should be the temporal pattern of river incision rather than its spatial variation that is helpful for unraveling the change in the forcing factor of downcutting. AU - Lu, Honghua AU - Wu, Dengyun AU - Zhang, Huiping AU - Ma, Yuanxu AU - Zheng, Xiangmin AU - Li, Youli DA - 2020/05/15/ DO - 10.1016/j.geomorph.2020.107100 KW - Fluvial terrace River-incision rate Spatial pattern The Tian Shan PY - 2020 RN - loess SN - 0169-555X SP - 107100 JO - Geomorphology TI - Spatial patterns of Late Quaternary river incision along the northern Tian Shan foreland UR - http://www.sciencedirect.com/science/article/pii/S0169555X20300726 VL - 357 ID - 72 ER - TY - JOUR AB - Drainage basins are useful recorders of tectonics and climate. The Datong River, which drains the Qilian Mountains, China, is one of the most elongated river basins of the world. How this unusual basin configuration was established remains unknown, despite this area being ideal for assessing the controlling effects of tectonics and climate on the drainage evolution. In this study, we reconstruct the history of the drainage evolution of the Datong River, using integrated provenance methods (UPb dating, heavy mineral and gravel compositions) and river terrace dating. The drainage system of the modern Datong River began to form at ~1100 ka, and the drainage basin was limited to the area of the lower modern Datong River. Since then, it has gradually extended through headward erosion. The river channelized into the Menyuan Basin between ~620 ka and ~420 ka, and it captured the upper Datong River between ~130 ka and ~60 ka. We suggest that the rapid uplift of the Qilian Mountains disrupted and longitudinally deflected the transverse rivers over the past 1100 ka. Additionally, intensified precipitation and glacial meltwater enhanced the river incision and captured the middle and upper Datong River during 620–420 ka and 130–60 ka, respectively. This model shows that the direction of drainage pattern evolution is controlled by tectonics and that the timing of drainage reorganization is controlled by climate change in the active fold-thrust belt. AU - Ma, Zhenhua AU - Feng, Zhantao AU - Peng, Tingjiang AU - Liu, Shanpin AU - Li, Meng AU - Guo, Benhong AU - Li, Xiaomiao AU - Song, Chunhui AU - Zhao, Zhijun AU - Li, Jijun DA - 2020/03/15/ DO - 10.1016/j.geomorph.2019.107021 KW - Drainage evolution Tectonics and climate Datong River Provenance analysis PY - 2020 RN - fluvial ESR SN - 0169-555X SP - 107021 JO - Geomorphology TI - Quaternary drainage evolution of the Datong River, Qilian Mountains, northeastern Tibetan Plateau, China UR - http://www.sciencedirect.com/science/article/pii/S0169555X19305124 VL - 353 ID - 31 ER - TY - JOUR AB - Hillslopes represent areas of predominant denudation and constitute the transition and trajectory to floodplains; they play a crucial role in understanding the long-term landscape evolution of desert environments. However, although hillslope processes are known to be very slow or even stagnant in (hyper-) arid environments, process mechanisms under the virtual absence of water are poorly understood, and process rates are essentially unknown. Based on irrigation experiments, different monitoring techniques including drone-based high-resolution digital elevation models, geomorphological, stratigraphical, geochronological (OSL), sedimentological and geochemical investigations, as well as μCT scans of sediment cores, this contribution presents detailed insights into the chronostratigraphy of tongue-shaped, 50 m-long and 30 m-wide fine sediment lobes located along a 10–30° steep thrust-related slope east of the Salar Grande (Atacama, Chile). Irrigation experiments were performed to gain insights into precipitation thresholds for surface runoff and hillslope dynamics. Although artificial rainfall intensities were ~46 mm/h, infiltration was 100%, and the experiments did not initiate surface runoff or (detectable) slope material displacements. In addition, a distinct stratigraphic pattern with buried paleo-surfaces and paleo-biological surface crusts suggests increased hillslope activity during the late Pleistocene, potentially driven by changes of (fog-induced) humidity, salt-related shrink and swell processes, or paleo-seismic activity. While a variety of geo-bio-archives document periods of increased precipitation in the Andean parts of the Atacama Desert throughout the Quaternary, evidence for contemporaneous paleoclimatic changes from areas disconnected to Andean precipitation fluctuations (i.e., the Coastal Cordillera) is scarce. In this regard, the investigated landforms potentially represent one of only few sediment records recording paleoclimatic changes in the central desert, independent from Andean rainfall. AU - May, Simon Matthias AU - Meine, Lennart AU - Hoffmeister, Dirk AU - Brill, Dominik AU - Medialdea, Alicia AU - Wennrich, Volker AU - Gröbner, Marie AU - Schulte, Philipp AU - Steininger, Florian AU - Deprez, Maxim AU - de Kock, Tim AU - Bubenzer, Olaf DA - 2020/01/01/ DO - 10.1016/j.gloplacha.2019.103057 PY - 2020 RN - colluvial SN - 0921-8181 SP - 103057 JO - Global and Planetary Change TI - Origin and timing of past hillslope activity in the hyper-arid core of the Atacama Desert – The formation of fine sediment lobes along the Chuculay Fault System, Northern Chile UR - http://www.sciencedirect.com/science/article/pii/S0921818119305429 VL - 184 ID - 157 ER - TY - JOUR AB - The 33 km-long Ragged Mountain fault (RMF) forms the northwestern corner of the Yakutat Terrane, which is colliding with the North American plate in south coastal Alaska at ∼5.5cm/yr. The fault zone contains three types of scarps in a zone up to 175m wide: (1) antislope scarps on the lower range front, (2) a sinuous thrust scarp at the toe of the range front, and (3) a swarm of flexural-slip scarps on the footwall. Trenches across the first two scarp types reveal evidence for two Holocene surface ruptures, plus several late Pleistocene ruptures. In the antislope scarp trench, ruptures occurred at 0.5–3.9 ka; slightly younger than 8.3 ka; and at 18.1–21.8 ka (recurrence intervals 4.4–8 kyr and 9.8–13.3 kyr). Displacements per event ranged from 15 to 40cm. In the thrust trench ruptures are dated at 2.8–5.9 ka; 5.9–17.2 ka, and 17.2–44.9 ka (mean recurrence intervals 7.2 kyr and 19.5 kyr). Displacements per event ranged from 26 to 77cm. We interpret the thrust fault as the primary seismogenic structure, and its largest trench displacement (77cm) equates to the average displacement expected for a 33 km-long reverse rupture. The flexural-slip scarp, in contrast, was rapidly formed ca. 4 ka but its sag pond sediments have continued to slowly fold up to present. The southern third of the fault is dominated by large gravitational failures of the range front (as large as 2.5km wide, 0.6-0.7km long, and 200–250m thick), which head in a linear, 40 m-deep range-crest trough filled with lakes, a classic expression of deep-seated gravitational slope deformation. AU - McCalpin, J. P. AU - Gutierrez, F. AU - Bruhn, R. L. AU - Guerrero, J. AU - Pavlis, T. L. AU - Lucha, P. DA - 2020/02/15/ DO - 10.1016/j.geomorph.2019.106875 KW - Paleoseismology Tectonic geomorphology Trenching Yakutat Terrane PY - 2020 RN - earthquake (and fault related) SN - 0169-555X SP - 106875 JO - Geomorphology TI - Tectonic geomorphology and late Quaternary deformation on the Ragged Mountain fault, Yakutat microplate, south coastal Alaska UR - http://www.sciencedirect.com/science/article/pii/S0169555X19303666 VL - 351 ID - 18 ER - TY - JOUR AB - The feasibility of using radiophotoluminescence from Ag-doped alkali-phosphate glass as an in-situ, sub-surface environmental radiation monitor is examined. GD-302M glass from Chiyoda Technol Corporation was attached to the end of a silica optical fiber inside a stainless-steel probe and inserted into soil to a depth of ~1 m. Radiophotoluminescence (RPL) from the GD-302M detectors was stimulated along the fiber using a 355 nm pulsed laser and RPL emission was directed along the same fiber and detected by a photomultiplier tube. Restrictions on the average laser power to be used in the experiments were observed due to the creation of an RPL signal for a zero-dose sample, or depletion of the radiation-induced signal from an irradiated sample. Short (1 s), low-frequency (1 kHz) laser stimulation rendered such effects negligible, while providing sufficient sensitivity to enable measurements of environmental doses of ~100 μGy. AU - McKeever, S. W. S. AU - Sholom, S. AU - Shrestha, N. AU - Klein, D. M. DA - 2020/03/01/ DO - 10.1016/j.radmeas.2020.106273 KW - Radiophotoluminescence Ag-doped alkali phosphate glass Environmental dosimetry Sub-surface optical probe PY - 2020 RN - dosimetry SN - 1350-4487 SP - 106273 JO - Radiation Measurements TI - An in-situ, fiber-optic system for sub-surface, environmental dose measurements using radiophotoluminescence from Ag-doped alkali-phosphate glass UR - http://www.sciencedirect.com/science/article/pii/S1350448720300378 VL - 132 ID - 78 ER - TY - JOUR AB - The build-up of radiophotoluminescence (RPL) from Ag-doped alkali-phosphate glass (from Chiyoda Technol Corporation, Japan) was measured both during and immediately following irradiation. The post-irradiation build-up curve was measured at several different temperatures and could be described by the sum of two exponential functions of time. The two processes are thermally activated, with activation energies of 0.45 eV and 0.17 eV, and their relative contributions were observed to behave in opposite senses as the temperature increases. Thermal quenching of the RPL signal with increasing temperature was also observed. The real-time RPL signal during irradiation could be described by the convolution of an intrinsic growth function and the build-up curve. A model is proposed wherein Ag2+-pairs and Ag2+ centers contribute to the RPL signal. A set of non-linear differential equations was written to describe the build-up process and numerical solution of these equations yielded simulated results which qualitatively matched the observed experimental data. AU - McKeever, Stephen W. S. AU - Sholom, Sergey AU - Shrestha, Nishan AU - Klein, David M. DA - 2020/03/01/ DO - 10.1016/j.radmeas.2020.106246 PY - 2020 RN - dosimetry SN - 1350-4487 SP - 106246 JO - Radiation Measurements TI - Build-up of radiophotoluminescence (RPL) in Ag-doped phosphate glass in real-time both during and after exposure to ionizing radiation: A proposed model UR - http://www.sciencedirect.com/science/article/pii/S135044872030010X VL - 132 ID - 79 ER - TY - JOUR AB - Geological records indicate that the hyper-aridity in the Atacama Desert has prevailed since at least the mid-Miocene, with shorter periods of increased humidity punctuating long-term aridity. The 7-m-high accumulation of colluvial sediments at the Salar Grande (21°S/70°W) studied here provides a key palaeoclimate record to understand hillslope dynamics and its relation to humid periods. While 10Be surface exposure ages point to long-term surface stability of the flat upslope surface, a combination of humidity-driven soil creep, overland flow and soil creep related to seismic shaking, caused denudation of the hillslope and accumulation of several metres of colluvium over much shorter timescales during the last 130 ka. A robust chronology for the hillslope sediments has been established by using Infrared Stimulated luminescence (pIR-IR225 protocol) on K-feldspar extracts from nine samples collected within the accumulation. A series of tests has been carried out to confirm the suitability of the method. The estimated ages indicate accelerated sedimentation at 35–80 ka, and 100–130 ka, which are interpreted as periods with more humid climate conditions than present. These findings agree with climate variations in the hyper-arid Atacama indicated by the activity of coastal alluvial fans and river catchments. AU - Medialdea, Alicia AU - May, Simon Matthias AU - Brill, Dominik AU - King, Georgina AU - Ritter, Benedikt AU - Wennrich, Volker AU - Bartz, Melanie AU - Zander, Anja AU - Kuiper, Klaudia AU - Hurtado, Santiago AU - Hoffmeister, Dirk AU - Schulte, Philipp AU - Gröbner, Marie AU - Opitz, Stephan AU - Brückner, Helmut AU - Bubenzer, Olaf DA - 2020/01/01/ DO - 10.1016/j.gloplacha.2019.103086 KW - Palaeoclimate Atacama Desert Hyper-aridity Infrared stimulated luminescence dating IRSL Hillslope processes Hillslope deposits PY - 2020 RN - ESR colluvial SN - 0921-8181 SP - 103086 JO - Global and Planetary Change TI - Identification of humid periods in the Atacama Desert through hillslope activity established by infrared stimulated luminescence (IRSL) dating UR - http://www.sciencedirect.com/science/article/pii/S0921818119305715 VL - 185 ID - 154 ER - TY - JOUR AB - Marine sediment cores offer a great number of proxies for reconstructions of past environmental conditions, such as ocean temperature, salinity, primary productivity, stratification of the upper water column, and continental precipitation. Up to date, continental precipitation archived in marine sediment cores is reconstructed based mainly on the hydrogen isotopic composition of plant-wax compounds (i.e., n-alkane δD) or on the ratio between terrigenous and marine sediments expressed as elemental ratios (e.g., ln (Fe/Ca)). Although these proxies provide reliable precipitation reconstructions, there are some inherent limitations, as plant-wax δD application depends on the availability of n-alkanes in marine sediments and elemental ratios can be influenced by other factors like the relative sea-level, primary productivity, and postdepositional processes. Here we introduce new precipitation proxies based on optically stimulated luminescence and thermoluminescence signals of quartz and feldspar. The rationale is that when precipitation changes over the catchment through time, different sediment sources regarding weathering intensity and parent rock types are drained, supplying sediments with varying signals of luminescence to the ocean. We compared our new proxy records with records of well-established proxies, for the same (ln (Fe/Ca)) and neighboring (n-alkane δD) marine sediment cores. The comparison among all proxies as well as with a state-of-art transient climate model run (TraCE-21ka) demonstrates that the new proxies accurately constrain precipitation changes over northeastern Brazil for the last 30,000 years. The main advantage of these new proxies relies on their fast response to precipitation changes over the continent. Furthermore, they are straightforward to measure and not expensive. AU - Mendes, Vinícius R. AU - Sawakuchi, André O. AU - Chiessi, Cristiano M. AU - Giannini, Paulo C. F. AU - Rehfeld, Kira AU - Mulitza, Stefan DA - 2019/08/01 DO - 10.1029/2019PA003691 KW - continental precipitation new proxy IS - 8 PY - 2019 RN - basic research SN - 2572-4517 SP - 1476-1486 JO - Paleoceanography and Paleoclimatology TI - Thermoluminescence and optically stimulated luminescence measured in marine sediments indicate precipitation changes over northeastern Brazil UR - https://doi.org/10.1029/2019PA003691 VL - 34 Y2 - 2020/07/06 ID - 166 ER - TY - JOUR AB - Here we present an integrated earth surface process and paleoenvironmental study from the Tingri graben and the archaeological site of Su-re, located on the southern rim of the Tibetan plateau, spanning the past ca. 30 ka. The study area is characterized by cold climate earth surface processes and aridity due to its altitude and location in the rain shadow of the Mount Everest–Cho Oyu massif and is thus sensitive to climatic and anthropogenic perturbations. In this highly dynamic geomorphic environment, paired-cosmogenic nuclide results from boulders on a massive hummocky moraine in the southern Tingri graben reveal complex exposure histories that limit our capability of directly dating the corresponding glacial advance, and shed a note of caution on previously published single-nuclide-based exposure ages along the northern Himalaya. Based on geomorphic considerations, however, the moraine clearly represents the local last glacial maximum, and likely coincided with a ∼344 ± 109 m drepression of discontinuous permafrost zone relative to today during the global last glacial maximum (gLGM). This greatly intensified permafrost and periglacial hillslope processes and led to fluvial aggradation of the valley floors of ≥12 m. We observe formation of a thick (≥50 cm) pedo-complex starting at ca. 6.7 ka before present (BP) and erosional truncation at ca. 3.9 ka BP. Widespread landscape instability and erosion characterize the region subsequent to 3.9 ka and intensifies in the 15th century AD. Several lines of (geo)archaeological evidence, including the presence of pottery sherds, sling-shot projectiles and hammer stones within the sedimentary record, indicate human presence at Su-re since ca. 3.9 ka BP. Our data suggest that in the Su-re-Tingri area climatic conditions were warm and moist enough to allow vegetation expansion and soil formation only from ca. 6.7–3.9 ka, followed by weakening of the Indian summer monsoon (ISM) strength between ca. 4.2 and 3.9 ka, which is a prominent climatic event in the wider Asian monsoon region, and reflected in the investigation area by the 3.9 ka erosional boundary. Merging our Holocene landscape reconstruction with the geoarchaeological evidence, we speculate that the combined effect of Little Ice Age (LIA) cooling and an anthropogenic overuse of the landscape led to climatically induced landscape degradation and ultimately to an anthropogenically triggered ecological collapse in the 15th century. Such a scenario is in-line with regional historical data on declining monastery construction and migration of the ethnic group of the Sherpas. From an earth surface dynamics perspective, we find that transient landscape processes on the southern rim of the Tibetan plateau are strongly linked to millennial scale changes in the ISM intensity and duration. We identify three types of unidirectional non-linear ISM-landscape interactions. Given that the Tibetan plateau is the largest high-altitude landmass on our planet and our limited understanding of several of the key earth surface processes on the plateau, we pinpoint the need for more long-term (Quaternary scale) empirical data particularly on permafrost and periglacial processes and human-environment interactions. AU - Meyer, M. C. AU - Gliganic, L. A. AU - May, J. H. AU - Merchel, S. AU - Rugel, G. AU - Schlütz, F. AU - Aldenderfer, M. S. AU - Krainer, K. DA - 2020/02/01/ DO - 10.1016/j.quascirev.2019.106127 PY - 2020 RN - glacial and periglacial archaeology SN - 0277-3791 SP - 106127 JO - Quaternary Science Reviews TI - Landscape dynamics and human-environment interactions in the northern foothills of Cho Oyu and Mount Everest (southern Tibet) during the Late Pleistocene and Holocene UR - http://www.sciencedirect.com/science/article/pii/S0277379119307565 VL - 229 ID - 24 ER - TY - JOUR AB - Geomorphic evidences and geochronology suggest recent tectonic activity in the Belt of Schuppen of Dimapur and Peren districts of Nagaland. Multiple levels of strath terraces forming remarkable geomorphic expressions are observed along the Chathe and Jharnapani river valleys. They indicate episodic uplift of the hanging-wall blocks of the thrust systems. The major lineaments prominently trend parallel to the NE?SW regional thrusts, some being perpendicular or oblique. Active normal faults displacing bedrock and overlying fill sediments point to recent tectonic activity. The parallel and trellis drainage patterns are lineament-controlled. Uplift of the terrain is evident from successive palaeochannels of the Chathe River younging towards the southwest. Three major aggradational phases of the terrace sediments are inferred from optically stimulated luminescence (OSL) chronology, the oldest beginning around 21 ka, the second around 11?7 ka, and the youngest between 3.5 and 1 ka. A sand lens of a tilted strath terrace exposed between Kukidolong and Chumukedima is dated at 7 ka, indicating tectonic events after 7 ka. Five major phases of bedrock uplift/incision have been estimated during 20 ka (0.13 mm/year), 11 ka (0.92 mm/year), 9 ka (2.29 mm/year), 6 ka (0.67 mm/year), and 1.8 ka (2.6 mm/year). Transverse topographic symmetry and asymmetry factor data suggest tilting towards the NE and SW. Other morphometric indices, such as channel sinuosity, stream length gradient index, valley floor to valley height ratio, and mountain front sinuosity, suggest that the area is tectonically active, which corroborates field observations. AU - Moiya, Jaowang N. AU - Luirei, Khayingshing AU - Longkumer, Limasanen AU - Kothyari, Girish Ch AU - Thong, Glenn T. DA - 2020/01/01 DO - 10.1002/gj.3413 KW - active faults belt of Schuppen Quaternary deformation strath terraces IS - 1 PY - 2020 RN - fluvial SN - 0072-1050 SP - 457-476 JO - Geological Journal TI - Late Quaternary deformation in parts of the Belt of Schuppen of Dimapur and Peren districts, Nagaland, NE India UR - https://doi.org/10.1002/gj.3413 VL - 55 Y2 - 2020/05/21 ID - 119 ER - TY - JOUR AB - The Kimberley region of Western Australia is one of the largest and most diverse rock art provenances in the world, with a complex stylistic sequence spanning at least 16 ka, culminating in the modern art-making of the Wunumbal people. The Gunu Site Complex, in the remote Mitchell River region of the northwest Kimberley, is one of many local expressions of the Kimberley rock art sequence. Here we report excavations at two sites in this complex: Gunu Rock, a sand sheet adjacent to rock art panels; and Gunu Cave, a floor deposit within an extensive rockshelter. Excavations at Gunu Rock provide evidence for two phases of occupation, the first from 7–8 to 2.7 ka, and the second from 1064 cal BP. Excavations at Gunu Rock provide evidence for occupation from the end of the second phase to the recent past. Stone for tools in the early phase were procured from a variety of sources, but quartz crystal reduction dominated the second occupation phase. Small quartz crystals were reduced by freehand percussion to provide small flake tools and blanks for manufacturing small points called nguni by the Wunambal people today. Quartz crystals were prominent in historic ritual practices associated with the Wanjina belief system. Complex methods of making bifacially-thinned and pressure flaked quartzite projectile points emerged after 2.7 ka. Ochre pigments were common in both occupation phases, but evidence for occupation contemporaneous with the putative age of the oldest rock art styles was not discovered in the excavations. Our results show that developing a complete understanding of rock art production and local occupation patterns requires paired excavations inside and outside of the rockshelters that dominate the Kimberley. AU - Moore, Mark W. AU - Westaway, Kira AU - Ross, June AU - Newman, Kim AU - Perston, Yinika AU - Huntley, Jillian AU - Keats, Samantha AU - Kandiwal Aboriginal, Corporation AU - Morwood, Michael J. DO - 10.1371/journal.pone.0226628 IS - 2 PY - 2020 RN - archaeology SP - e0226628 JO - PLOS ONE TI - Archaeology and art in context: Excavations at the Gunu Site Complex, Northwest Kimberley, Western Australia UR - https://doi.org/10.1371/journal.pone.0226628 VL - 15 ID - 30 ER - TY - JOUR AB - The long-term bedrock incision of streams in the northeastern Negev has been dictated, since the Early Pliocene, by the subsidence of the Dead Sea basin. However, this incision is accompanied by very long intervals of sediment aggradation. Here, we document the Quaternary-scale fluvial response to changing base-level, lithology, structure, and climate along the hyperarid Nahal Zafit, NE Negev. The oldest (~1–2 Ma) alluvial remnants point to a widespread beveled bedrock pediment at the base of the Hazera anticline. This pediment, like other stream-pediment-anticline relationships in the region, provides the baseline framework into which Nahal Zafit incises. During the Early to Middle Pleistocene, this pediment was the base-level for all streams emerging out of the anticlines. The tectonic subsidence of the regional base-level at the rift margin farther downstream, has caused incision and upstream migration of bedrock knickpoints, triggering the development of a wide incised valley in the Mazar syncline, adjacent to the Hazera anticline. Since ~330 ka, fluvial terraces, landslides and taluses record intervals of basin-wide fluvial deposition under prevailing hyperarid to arid climate. Despite the general arid climate, prolonged fluvial deposition intervals occurred at ca. 330–265, 230–125, and 110–20 ka. Rapid and quite short-duration bedrock incision occurred in-between these, much longer, intervals of aggradation. In addition to the proposed climatic imprint on fluvial aggradation-incision cycles and the first-order base-level control of the rift margin fault, the formation of strath terraces and distribution of stored sediments within the drainage basin point to the fundamental role that lithology and structure play in the Quaternary evolution of the NE Negev watersheds. AU - Neagu, Nathalie AU - Matmon, Ari AU - Enzel, Yehouda AU - Porat, Naomi DA - 2020/04/01/ DO - 10.1016/j.geomorph.2020.107042 KW - Alluvial terraces Hyperarid drainage systems Quaternary evolution OSL and CRN dating PY - 2020 RN - fluvial SN - 0169-555X SP - 107042 JO - Geomorphology TI - Quaternary evolution of a hyperarid drainage under climatic fluctuations and rift-margin base-level fall, NE Negev, Israel UR - http://www.sciencedirect.com/science/article/pii/S0169555X2030012X VL - 354 ID - 64 ER - TY - JOUR AB - Study of subsurface deposits often requires coring or drilling to obtain samples for sedimentologic and geochemical analysis. Geochronology is a critical piece of information for stratigraphic correlation and rate calculations. Increasingly, luminescence dating is applied to sediment cores to obtain depositional ages. This paper provides examples and discussion of guidelines for sampling sediment core for luminescence dating. Preferred protocols are dependent on the extraction method, sedimentology, core integrity, and storage conditions. The methods discussed include subsampling of sediment in opaque core-liners, cores without liners, previously open (split) cores, bucket auger samples, and cuttings, under red lighting conditions. Two important factors for luminescence sampling of sediment core relate to the integrity of the natural luminescence signal and the representation of the dose rate environment. The equivalent dose sample should remain light-safe such that the burial dose is not reset (zeroed) by light exposure. The sediment sampled for dose rate analyses must accurately represent all units within at least 15 cm above and below the equivalent dose sample. Where lithologic changes occur, units should be sampled individually for dose rate determination. Sediment core extraction methods vary from portable, hand-operated devices to large truck- or vessel-mounted drill rigs. We provide recommendations for luminescence sampling approaches from subsurface coring technologies and downhole samplers that span shallow to deep sample depths. AN - 10.3390/mps2040088 AU - Nelson, Michelle AU - Rittenour, Tammy AU - Cornachione, Harriet IS - 4 PY - 2019 RN - review SN - 2409-9279 SP - 88 JO - Methods and Protocols TI - Sampling methods for luminescence dating of subsurface deposits from cores UR - https://www.mdpi.com/2409-9279/2/4/88 VL - 2 ID - 10 ER - TY - JOUR AB - Alluvial and colluvial “cut and fill” deposits preserved in valleys of the Karoo, South Africa, reflect basin-scale adjustments in fluvial process-regime. Such deposits in the Wilgerbosch catchment have previously proven difficult to date using radiocarbon (14C) and optically stimulated luminescence (OSL) methods. In this paper, we test the suitability of K-feldspar post-IR infrared (pIRIR) methods on 19 samples from Africanders Kloof, a low-order tributary of the Sundays River. Using three carefully screened quartz OSL ages, radiocarbon dating and site stratigraphic considerations we argue that the pIRIR170 protocol can be used to produce reliable age estimates. Fading rates for the pIRIR170 signal are consistently low (average g2days: 0.81 ± 0.58). The pIRIR170 residuals are dose dependent (r2 = 0.58); but are consistently low as a proportion (e.g. 1–4%) of sample equivalent dose (De). Despite the water-lain depositional context, single aliquot De distributions tend toward normality (for 11/19 samples) irrespective of aliquot size (2 mm or micro-aliquots containing 2–30 grains) with only a few statistical outliers per sample (max. n = 3) and overdispersion (OD) ranging from 1.6 to 30% excluding the two youngest (late Holocene) samples (OD: 37–87%). The resulting pIRIR170 ages are in the correct stratigraphic order and illustrate the potential of pIRIR170 luminescence dating to investigate the timing, processes and drivers of fluvial system adjustments across the Karoo. AU - Oldknow, C. J. AU - Carr, A. S. AU - Hooke, J. M. AU - Shen, Z. DA - 2020/06/01/ DO - 10.1016/j.quageo.2020.101064 KW - K-rich feldspar Post-IR IRSL OSL Bleaching Fading PY - 2020 RN - fluvial SN - 1871-1014 SP - 101064 JO - Quaternary Geochronology TI - The suitability of a low temperature post-IR IRSL signal for dating alluvial and colluvial “cut and fill” sequences in the Great Karoo, South Africa UR - http://www.sciencedirect.com/science/article/pii/S1871101420300133 VL - 58 ID - 149 ER - TY - JOUR AB - Prograded barrier systems record shoreline behaviour and palaeoenvironmental information. The Guichen Bay Holocene embayment fill succession in South Australia has been subject to several prominent studies; however, several important unanswered questions remained regarding the timing of the older ridge sets at this site. Additional Optically Stimulated Luminescence (OSL) dating indicates that progradation commenced in the southeastern corner of the plain ~7300 years ago and was rapid between ~5800 and ~5000 years ago. To augment this record, three OSL dating transects were constructed at nearby Rivoli Bay in the north, central and south. Rapid progradation occurred in the south and then north of the Rivoli plain until ~5000 years ago. Steady progradation occurred in the centre of the plain between ~5000 years ago and present. Rapid shoreline progradation at Guichen and Rivoli Bays before ~5000 years ago was due to the input of sediment from the erosion of Robe and Woakwine Ranges and the inner continental shelf as sea levels rose to present. Raised beach strata imaged with Ground Penetrating Radar (GPR) at Rivoli Bay suggest a sea-level highstand of +2 m above present ~3500 years ago, steadily falling and reaching the present ~1000 years ago. This concurs with evidence from Guichen Bay and may have promoted shoreline progradation. Sediment infilling of Guichen and Rivoli Bays and the fall in sea level restricted the marine corridor between the Woakwine and Robe Ranges to a narrow channel by ~4000 and ~2000 years in the north and south, respectively. Holocene shoreline behaviour was influenced by changing sediment supply and shoreline reorientation with changing wave refraction patterns. AU - Oliver, Thomas S. N. AU - Murray-Wallace, Colin V. AU - Woodroffe, Colin D. DA - 2020/01/01 DO - 10.1177/0959683619875815 IS - 1 PY - 2020 RN - coastal SN - 0959-6836 SP - 106-124 JO - The Holocene TI - Holocene shoreline progradation and coastal evolution at Guichen and Rivoli Bays, southern Australia UR - https://doi.org/10.1177/0959683619875815 VL - 30 Y2 - 2020/01/16 ID - 16 ER - TY - JOUR AB - Phenomenological models are frequently used to analyze experimental signals in thermally and optically stimulated luminescence experiments. Typically, these models consist of systems of differential equations describing various electronic transitions. An alternative to the differential equation approach is the use of Monte Carlo (MC) methods, which also allow an estimation of the theoretical stochastic uncertainty of the intensity of the luminescence signal. By running and averaging several MC variants, these stochastic uncertainties are estimated in this paper for various luminescence models. In the case of first-order kinetics processes, the MC results compare well with previously published analytical results for the coefficient of variation (CV) in stochastic linear pure death processes. By contrast, no analytical results are available for the more general one trap one recombination center model (OTOR), and MC is the only method available for estimating the stochastic uncertainties. In this paper the CV coefficients are simulated for three commonly used experimental stimulation modes, namely thermally stimulated luminescence (TL), continuous-wave optically stimulated luminescence (CW-OSL) and linearly modulated OSL (LM-OSL). The results of the simulations show that CW-OSL signals have the smallest CV values among the three stimulation modes, and therefore these signals are least likely to exhibit stochastic variations. The stochastic uncertainties in these phenomenological models are discussed in the context of single grain luminescence experiments and nanodosimetric materials, in which one deals with small numbers of charge carriers. AU - Pagonis, Vasilis AU - Kreutzer, Sebastian AU - Duncan, Alex Roy AU - Rajovic, Ena AU - Laag, Christian AU - Schmidt, Christoph DA - 2020/03/01/ DO - 10.1016/j.jlumin.2019.116945 KW - Birth and death stochastic processes Monte Carlo method Thermoluminescence Optically stimulated luminescence Infrared stimulated luminescence PY - 2020 RN - basic research SN - 0022-2313 SP - 116945 JO - Journal of Luminescence TI - On the stochastic uncertainties of thermally and optically stimulated luminescence signals: A Monte Carlo approach UR - http://www.sciencedirect.com/science/article/pii/S0022231319322057 VL - 219 ID - 14 ER - TY - JOUR AB - Kiacatoo Man, a large, rugged Aboriginal adult buried in the Lachlan riverine plains of southeastern Australia, was discovered in 2011. Laser-ablation uranium series analysis on bone yielded a minimum age for the burial of 27.4?±?0.4 ka (2σ). Single-grain, optically stimulated luminescence ages on quartz sediment in which the grave had been dug gave a weighted mean age of 26.4?±?1.5 ka (1σ). Luminescence samples from the grave infill and from sediment beneath the grave exhibit overdispersed dose distributions consistent with bioturbation or other disturbance, which has obscured the burial signal. The overlap between the minimum (U-series) and maximum (luminescence) ages places the burial between 27.0 and 29.4 ka (2σ). Luminescence ages obtained from the channel belt of between 28?±?2 and 25?±?3 ka indicate that fluvial sedimentation was occurring before the Last Glacial Maximum, which is consistent with the broader geomorphic setting. Together, these results are internally and regionally consistent, and indicate that Kiacatoo Man was one of the more ancient individuals so far identified in Australia. His remains are important to our understanding of patterns of biological variation and other processes that have shaped people in the Murray-Darling Basin through time. AU - Pietsch, Timothy AU - Kemp, Justine AU - Pardoe, Colin AU - Grün, Rainer AU - Olley, Jon AU - Wood, Rachel DA - 2019/11/01 DO - 10.1002/jqs.3165 KW - archaeology luminescence dating quartz OSL U-series Wiradjuri IS - 8 PY - 2019 RN - archaeology SN - 0267-8179 SP - 662-673 JO - Journal of Quaternary Science TI - A multi-method approach to dating the burial and skeleton of Kiacatoo Man, New South Wales, Australia UR - https://doi.org/10.1002/jqs.3165 VL - 34 Y2 - 2020/07/06 ID - 174 ER - TY - JOUR AB - This study is concerned with the rate of soil formation in Arenosols of dunes on the barrier island Spiekeroog at the southern North Sea coast. It focuses on Fe dynamics in the soils in relation to slope aspect, as well as on the interaction between minerals and soil organic matter (SOM) in the course of soil formation. Ten quartz-rich (≈ 95 wt%) Arenosols on slopes with different aspects (north/south), low in primary carbonates (≈ 0.5 wt%) and total Fe (Fet, ≈ 0.15 wt%), were studied across a soil chronosequence with optically stimulated luminescence (OSL) ages between 43 ± 7 and 279 ± 26 years. During this period, pH (CaCl2) decreased from 7.1 in fresh sands to 3.1 in initially podzolized soils. SOM contents and the optical density of oxalate extracts (ODOE) increased with soil age. Differences in Fe stocks, vertical distribution of Fed, Feo and Fep and horizontation of equally old soils indicated an influence of microclimate on pedogenesis determined by slope aspect. Initial podzolization features occurred after 179 ± 17 years. Eluviation resulted in the formation of an E horizon free of amorphous and poorly crystalized Fe oxides (Feo-Fep), indicating that these oxides provided a source of Fe during podzolization. However, illuviation features were absent. Field findings, macroscopic examinations and carbon fractionations revealed, that SOM was exclusively present in free particulate form (free POM). This indicated, that prior to podzolization, mineral grains did not become enclosed by organic pigments during the formation of Ah horizons. AU - Pollmann, Thomas AU - Tsukamoto, Sumiko AU - Frechen, Manfred AU - Giani, Luise DA - 2020/03/01/ DO - 10.1016/j.geodrs.2019.e00246 KW - Arenosols Chronosequence Initial podzolization OSL dating Pedogenesis Slope aspect PY - 2020 RN - soil SN - 2352-0094 SP - e00246 JO - Geoderma Regional TI - Rate of soil formation in Arenosols of dunes on Spiekeroog Island (Germany) UR - http://www.sciencedirect.com/science/article/pii/S2352009419302457 VL - 20 ID - 170 ER - TY - JOUR AB - The present work attempts to study tentative gamma dose rate effects for the stable TL and OSL signals of specific, well established artficial luminescence dosimeters. Two different dose rates of gamma radiation (2 and 31 Gy/h) were used. The study has been performed to the stable TL peaks of 5 different TL phosphors (LiB4O7:Cu,In; MgB4O7:Dy,Na; LiF:Mg,Ti; CaF2:Dy; BeO) as well as to both OSL components of BeO. Tentative dose rate effects were studied for both dosimetric dose response features as well as kinetic parameters after deconvolution for both signals. Two different groups of materials were revealed. The first one includes materials such as LiF: Mg,Ti, BeO and MgB4O7: Dy,Na; for these, both TL dose response features and TL kinetic parameters are independent on the dose rate. This is also the case for both OSL components of BeO besides the linearity index of the dose response of the fast OSL component; the latter seems to mildly depend on the dose rate. At the same time, experimental arguments based on both dosimetric as well as deconvolution features suggest the presence of tentative dose rate effects for the cases of LiB4O7:Cu, In and CaF2:Dy. Moreover, the effective use of these aforementioned features as probes for identification of dose rate effects is also discussed. The results of the present study suggest that the basic postulate of most phenomenological TL models that traps pre-exist and they are simply filled during irradiation has to be reconsidered. AU - Polymeris, George S. AU - Başdoğan, Miray AU - Çakal, Gaye Ö AU - Aşlar, Engin AU - Meriç, Niyazi DA - 2020/04/01/ DO - 10.1016/j.radmeas.2020.106282 KW - LiBO:Cu,In MgBO:Dy,Na LiF:Mg,Ti CaF:Dy BeO OSL TL Deconvolution Dose rate Dose response Kinetic parameters PY - 2020 RN - dosimetry SN - 1350-4487 SP - 106282 JO - Radiation Measurements TI - Gamma dose rate effects in luminescence signals of various artificial, well established dosimetric phosphors UR - http://www.sciencedirect.com/science/article/pii/S1350448720300469 VL - 133 ID - 95 ER - TY - JOUR AB - During experiments involving heating of dosimetric materials, trapped electrons are thermally excited and subsequently recombine with holes, producing a thermally stimulated luminescence signal. Thermal stimulation can take place either at a constant elevated temperature giving rise to a isothermal decay signal (PID), or with a constant heating rate which gives rise to a thermoluminescence (TL) signal. The recombination pathways during thermal stimulation stage (also called the readout stage), can be either of a delocalized nature involving the conduction band, or of a localized nature involving an excited state of the trapped electrons. The present work investigates the experimental conditions which can distinguish between delocalized and localized transitions during the readout stage. The dosimetric materials used in this study are LiF:Mg,Ti, BeO, a natural apatite and artificial porcelain. The results show that during the readout stage with a constant heating rate, the prevalent recombination mechanism in all these materials involves delocalized transitions. However, the results show that during an isothermal decay experiment, the recombination mechanism in LiF:Mg,Ti and BeO involves delocalized transitions, whereas in the case of apatite and artificial porcelain the recombination takes place through localized transitions. AU - Polymeris, George S. AU - Pagonis, Vasilis AU - Kitis, George DA - 2020/06/01/ DO - 10.1016/j.jlumin.2020.117142 KW - Thermoluminescence Isothermal TL LiF:Mg,Ti BeO Delocalized transition Localized transition Tunneling recombination PY - 2020 RN - basic research SN - 0022-2313 SP - 117142 JO - Journal of Luminescence TI - Investigation of thermoluminescence processes during linear and isothermal heating of dosimetric materials UR - http://www.sciencedirect.com/science/article/pii/S002223131932383X VL - 222 ID - 100 ER - TY - JOUR AB - Stratigraphic records extending to Marine Oxygen Isotope Stage (MIS) 3 (57,000–29,000 cal yr BP) or older in Beringia are extremely rare. Three stratigraphic sections in interior western Alaska show near continuous sedimentological and environmental progressions extending from at least MIS 3, if not older, through MIS 1 (14,000 cal yr BP–present). The Kolmakof, Sue Creek, and VABM (vertical angle bench mark) Kuskokwim sections along the central Kuskokwim River, once a highland landscape at the fringe of central and eastern Beringia, contain aeolian deposition and soil sequences dating beyond 50,000 14C yr BP. Thick peaty soil, shallow lacustrine, and tephra deposits represent the MIS 3 interstade (or older). Sand sheet and loess deposits, wedge cast development, and very thin soil development mark the later MIS 3 period and the transition into the MIS 2 stade (29,000–14,000 cal yr BP). Loess accumulation with thicker soil development occurred between ~16,000–13,500 cal yr BP at the MIS 2 and MIS 1 transition. After ~13,500 cal yr BP, loess accumulation waned and peat development increased throughout MIS 1. These stratigraphic sequences represent transitions between a warm and moist period during MIS 3, to a cooler and more arid period during MIS 2, then a return to warmer and moister climates in MIS 1. AU - Reuther, Joshua D. AU - Rogers, Jason AU - Druckenmiller, Patrick AU - Bundtzen, Thomas K. AU - Wallace, Kristi AU - Bowman, Robert AU - May, Kevin AU - Feathers, James AU - Cherkinsky, Alexander DB - Cambridge Core DO - 10.1017/qua.2019.51 DP - Cambridge University Press ET - 10/14 KW - MIS 3 interstade MIS 2 stade MIS 1 Holocene Stratigraphic records Aeolian deposition Peat development Eastern Beringia Western Alaska PY - 2020 RN - tephra (and volcanic related) SN - 0033-5894 SP - 139-154 JO - Quaternary Research TI - Late Quaternary (≥MIS 3 to MIS 1) stratigraphic transitions in a highland Beringian landscape along the Kuskokwim River, Alaska UR - https://www.cambridge.org/core/article/late-quaternary-mis-3-to-mis-1-stratigraphic-transitions-in-a-highland-beringian-landscape-along-the-kuskokwim-river-alaska/18DFE50AACDC6EB961FD0EEFBA463D1D VL - 93 ID - 127 ER - TY - JOUR AB - This paper explores the attenuation of beta and gamma dose rate in a radioactive and in an adjacent inert layer for K, Th and U, individually, using Geant4 simulations. The simulated beta dose rate attenuation cannot perfectly be described by a single exponential function, thus the updated attenuation coefficients were obtained using two exponential functions with intercepts related to the different slopes. Attenuation coefficients and intercepts are provided in the manuscript. The newly obtained beta dose rate attenuation coefficients differ from the previously published values by a factor of 2, which results in a larger attenuation of the beta dose rate, so that the infinite matrix dose rate is reached at ~2 mm into the sediment and at ~1.5 mm into a rock. The new gamma dose rate attenuation coefficients are in good agreement with previously published literature and it is shown that the infinite gamma dose rate is reached at 300 mm in wet sediment with a density of 2 g cm−3. AU - Riedesel, Svenja AU - Autzen, Martin DA - 2020/04/01/ DO - 10.1016/j.radmeas.2020.106295 KW - Dose rate attenuation Beta dose rate Gamma dose rate Rock surface dating Luminescence dating PY - 2020 RN - dose rate surface exposure dating SN - 1350-4487 SP - 106295 JO - Radiation Measurements TI - Beta and gamma dose rate attenuation in rocks and sediment UR - http://www.sciencedirect.com/science/article/pii/S1350448720300597 VL - 133 ID - 93 ER - TY - JOUR AB - Homo erectus is the founding early hominin species of Island Southeast Asia, and reached Java (Indonesia) more than 1.5 million years ago1,2. Twelve H. erectus calvaria (skull caps) and two tibiae (lower leg bones) were discovered from a bone bed located about 20 m above the Solo River at Ngandong (Central Java) between 1931 and 19333,4, and are of the youngest, most-advanced form of H. erectus5–8. Despite the importance of the Ngandong fossils, the relationship between the fossils, terrace fill and ages have been heavily debated9–14. Here, to resolve the age of the Ngandong evidence, we use Bayesian modelling of 52 radiometric age estimates to establish—to our knowledge—the first robust chronology at regional, valley and local scales. We used uranium-series dating of speleothems to constrain regional landscape evolution; luminescence, 40argon/39argon (40Ar/39Ar) and uranium-series dating to constrain the sequence of terrace evolution; and applied uranium-series and uranium series–electron-spin resonance (US–ESR) dating to non-human fossils to directly date our re-excavation of Ngandong5,15. We show that at least by 500 thousand years ago (ka) the Solo River was diverted into the Kendeng Hills, and that it formed the Solo terrace sequence between 316 and 31 ka and the Ngandong terrace between about 140 and 92 ka. Non-human fossils recovered during the re-excavation of Ngandong date to between 109 and 106 ka (uranium-series minimum)16 and 134 and 118 ka (US–ESR), with modelled ages of 117 to 108 thousand years (kyr) for the H. erectus bone bed, which accumulated during flood conditions3,17. These results negate the extreme ages that have been proposed for the site and solidify Ngandong as the last known occurrence of this long-lived species. AU - Rizal, Yan AU - Westaway, Kira E. AU - Zaim, Yahdi AU - van den Bergh, Gerrit D. AU - Bettis, E. Arthur AU - Morwood, Michael J. AU - Huffman, O. Frank AU - Grün, Rainer AU - Joannes-Boyau, Renaud AU - Bailey, Richard M. AU - Sidarto AU - Westaway, Michael C. AU - Kurniawan, Iwan AU - Moore, Mark W. AU - Storey, Michael AU - Aziz, Fachroel AU - Suminto AU - Zhao, Jian-xin AU - Aswan AU - Sipola, Maija E. AU - Larick, Roy AU - Zonneveld, John-Paul AU - Scott, Robert AU - Putt, Shelby AU - Ciochon, Russell L. DA - 2019/12/18 DO - 10.1038/s41586-019-1863-2 PY - 2019 RN - archaeology ESR SN - 1476-4687 SP - 381-385 JO - Nature TI - Last appearance of Homo erectus at Ngandong, Java, 117,000–108,000 years ago UR - https://doi.org/10.1038/s41586-019-1863-2 VL - 577 ID - 12 ER - TY - JOUR AB - The standardised growth curve (SGC) method has been applied to potassium-rich feldspar (K-feldspar) from samples at the Nihewan Basin, northern China. It was observed that the shapes of SGCs obtained from multiple-aliquot regenerative-dose (MAR) and single-aliquot regenerative-dose (SAR) procedures are different at high doses (>900 Gy) for the multiple-elevated-temperature post-IR IRSL (MET-pIRIR) signals observed at high temperatures (e.g., 290 °C) This difference can be attributed to the presence of residual signals in the MAR SGCs due to solar bleaching involved in the MAR procedure. Similar shapes of the SAR and MAR SGCs were obtained after correcting for the residual signals. Comparing the De estimates for both methods suggests that the SAR SGCs yield more reliable results. We tested the SAR SGCs for sediments from the Dadaopo section in the Nihewan Basin, including materials from the Brunhes/Matuyama (B/M) boundary (~780 ka). By interpolating the central re-normalised Ln/Tn ratios onto the corresponding SAR SGCs, the 290 °C MET-pIRIR signals yielded ages in stratigraphic order, and the sample from the B/M boundary yielded an age estimate broadly consistent with the expected age. Our results suggest that the MET-pIRIR SAR SGC method has the potential to date samples up to ~700–800 ka in this region. AU - Rui, Xue AU - Li, Bo AU - Guo, Yujie DA - 2020/04/01/ DO - 10.1016/j.quageo.2020.101063 KW - K-feldspar ratios Standardised growth curves Residual signal PY - 2020 RN - basic research SN - 1871-1014 SP - 101063 JO - Quaternary Geochronology TI - Testing the upper limit of luminescence dating based on standardised growth curves for MET-pIRIR signals of K-feldspar grains from northern China UR - http://www.sciencedirect.com/science/article/pii/S1871101420300121 VL - 57 ID - 57 ER - TY - JOUR AB - Overestimation in dose recovery results was observed at high doses (>1000 Gy) when a single-aliquot regenerative-dose (SAR) procedure is applied to the multiple-elevated-temperature post-IR IRSL (MET-pIRIR) signals from potassium-rich feldspar (K-feldspar) grains from the Nihewan Basin. Such overestimation results from the non-bleachable (residual) signals that were not appropriately corrected for. A signal-subtraction method was proposed to solve this problem, which involves building growth curves for the bleachable and non-bleachable signals. Here we modelled the effect of residual signal on equivalent dose (De) and found that even a small amount of residual signal may give rise to large overestimation at high doses. Our results highlight that residual signals may not only affect young samples but may lead to erroneous results for old samples. Our study also suggests that although residual signals may result in significant error in the dose recovery, they may have a very small effect on natural samples because their residual signals seem to be relatively small. AU - Rui, Xue AU - Li, Bo AU - Guo, Yujie DA - 2020/06/01/ DO - 10.1016/j.quageo.2020.101065 KW - K-feldspar MET-pIRIR Dose recovery Signal-subtraction Residual signal PY - 2020 RN - basic research SN - 1871-1014 SP - 101065 JO - Quaternary Geochronology TI - The effect of residual signal on dose measurements using MET-pIRIR signals from K-feldspar UR - http://www.sciencedirect.com/science/article/pii/S1871101420300145 VL - 58 ID - 151 ER - TY - JOUR AB - A new approach to the two-dimensional (2D) spatial radiation dosimetry based on optically stimulated luminescence (OSL) phenomena is presented. By investigating prototype dosimeters in form of flat and flexible sheets made of a polymer (PDMS), with the embedded OSL active grains (LiF:Mg,Cu,P), direct measurements of the 2D dose distribution using the OSL method and self-developed optical setup were verified. We have determined the response of 2D OSL prototype silicone foils, stimulated with the blue LEDs (470 nm) and read out using the CCD camera system, after doses of beta radiation ranging from less than 0.1 Gy up to 100 Gy. We have also verified the basic dosimetric parameters of the prototype sample foils, including the sensitivity (signal per dose), linearity, repeatability and fading effect. These encouraging results are the first step towards the practical use of LiF:Mg,Cu,P 2D OSL foils as a reusable spatial dosimeter system. AU - Sądel, M. AU - Bilski, P. AU - Kłosowski, M. AU - Sankowska, M. DA - 2020/04/01/ DO - 10.1016/j.radmeas.2020.106293 KW - Two-dimensional (2D) radiation dosimetry OSL LiF:Mg,Cu,P PY - 2020 RN - dosimetry SN - 1350-4487 SP - 106293 JO - Radiation Measurements TI - A new approach to the 2D radiation dosimetry based on optically stimulated luminescence of LiF:Mg,Cu,P UR - http://www.sciencedirect.com/science/article/pii/S1350448720300573 VL - 133 ID - 97 ER - TY - JOUR AB - The aim of the present study is to attempt assessing the age of a monumental olive tree located between the Antique Cities of Militus (Didim-Ayd?n region) and Iasos (Milas-Mu?la region). Wood from the trunk of an olive tree is not appropriate for conventional dating approaches such as dendrochronology or 14C. The sediments closely located surrounding and beneath the roots of the olive tree are considered indicative of the age of the planting event; therefore these sediments were dated using both quartz and feldspar luminescence signal protocols. Methodological aspects including the preheating plateaus, equivalent dose statistical approaches and dose rate using gamma spectrometry are also discussed, as dating of the associated palaeochannel sediments of the area are presented for the first time in the dating literature. The optically stimulated luminescence and/or infrared stimulated luminescence ages are extrapolated to date the event of the tree planting; it is the first time in the literature that an age is reported for an olive tree in the eastern Mediterranean region. The present study stands as the first experimental evidence that olive trees have been cultivated in the area since the Iron Age. AU - Şahiner, Eren AU - Polymeris, Georgios S. AU - Atlihan, M. Altay AU - Aktürk, Selcuk AU - Meriç, Niyazi DA - 2020/07/01 DO - 10.1002/jqs.3212 KW - Aegean region Anatolia infrared stimulated luminescence olive tree optically stimulated luminescence IS - 5 PY - 2020 RN - archaeology SN - 0267-8179 SP - 706-715 JO - Journal of Quaternary Science TI - Indirect dating of an olive tree planting event using luminescence of the sediments lying beneath the roots of the tree: a pilot study in the south-western part of Anatolia, Turkey UR - https://doi.org/10.1002/jqs.3212 VL - 35 Y2 - 2020/06/29 ID - 135 ER - TY - JOUR AB - Finding the source or provenance of quartz grains occurring in a specific location allows us to constrain their transport pathway, which is crucial information to solve diverse problems in geosciences and related fields. The optically stimulated luminescence (OSL) sensitivity (light intensity per unit mass per unit radiation dose) has a high capacity for discrimination of quartz sediment grains and represents a promising technique for provenance analysis. In this study, we tested the use of quartz OSL sensitivity (ultraviolet emission) measured under different preheating temperatures and with blue light stimulation at room temperature (~20 °C) for sediment provenance analysis. Quartz OSL sensitivity measured at 20 °C is positively correlated with the sensitivity of an OSL signal measured using procedures (preheat at 190 °C for 10 s, blue stimulation at 125 °C and initial 1 s of light emission) to increase the contribution of the fast OSL component, which has been successfully applied for sediment provenance analysis. The higher OSL signal intensity measured without preheating and with light stimulation at room temperature allows the use of lower given doses, thus reducing measurement time. Additionally, the OSL sensitivity measured at 20 °C in polymineral silt samples of a marine sediment core is also suitable for provenance analysis, as demonstrated by comparison with other independent proxies. OSL signals obtained through light stimulation at room temperature have thus the potential to considerably expand measurement possibilities, including in situ measurements using portable OSL readers. AU - Sawakuchi, André O. AU - Rodrigues, Fernanda C. AU - Mineli, Thays D. AU - Mendes, Vinícius R. AU - Melo, Dayane B. AU - Chiessi, Cristiano M. AU - Giannini, Paulo C. DO - 10.3390/mps3010006 KW - sediment provenance quartz fingerprint luminescence source-to-sink system IS - 1 PY - 2020 RN - basic research SN - 2409-9279 SP - 6 JO - Methods and Protocols TI - Optically stimulated luminescence sensitivity of quartz for provenance analysis VL - 3 ID - 131 ER - TY - JOUR AB - We estimated the eruption age of Kannabe volcano, located in southwestern Japan. Although the eruption age had been estimated using tephrochronology and K-Ar dating, the precision of its age determination left some room for improvement. The latest eruption age of Kannabe volcano is well constrained by wide spread tephras to ca. 7.2–30 ka. We applied paleomagnetic dating to a basaltic lava and optically stimulated luminescence (OSL) dating to a soil layer, which are associated with the Kannabe volcano. The soil layer above the Kannabe scoria was newly dated to be 21 ± 6 ka, as inferred from OSL dating. We also made paleomagnetic investigation to estimate the eruption age of the Kannabe basaltic lava. Paleomagnetic data of 23 rock samples from six locations in the Kannabe basaltic lava showed good mutual agreement. The average of remanent magnetizations yields declination of 0.3° and inclination of 65.9° with 95% confidence limit of 2.7°. This paleomagnetic direction with a relatively steep inclination is thought to be correlated with the paleomagnetic secular variation data of sediments in Lake Biwa at ca. 21.5 ka. Based on that information from multi-dating, we inferred that the Kannabe volcano erupted at ca. 22 ka. This result presents profound scientific implications for the precise age determination of young basaltic lava flow, for which few dating methods exist. AU - Shitaoka, Yorinao AU - Saito, Takeshi AU - Yamamoto, Junji AU - Miyoshi, Masaya AU - Ishibashi, Hidemi AU - Soda, Tsutomu DO - 10.1515/geochr-2015-0108 LA - English IS - 1 PY - 2019 RN - tephra (and volcanic related) SP - 49-56 JO - Geochronometria TI - Eruption age of Kannabe volcano using multi-dating: Implications for age determination of young basaltic lava flow UR - https://content.sciendo.com/view/journals/geochr/46/1/article-p49.xml VL - 46 ID - 108 ER - TY - JOUR AB - Morphological, sedimentological, and chronological evidence suggests the preservation of three glacial advances of decreasing magnitude in the Puche valley (near Leh), southern Ladakh Ranges. The oldest moraine of Puche Glacier Advance-1 (PGA-1) is optically dated to the early Marine Isotopic Stage (MIS)-2 (31.5 ± 3.3 ka) that persisted until around the global Last Glacial Maxima (LGM) (22.7 ± 1.6 ka). The PGA-2 is optically dated to the post LGM (14.4 ± 1.0 ka) and perhaps was triggered by meltwater pulse (1a?) cooling. The youngest PGA-3 remains undated and could be of Holocene age. The Optically Stimulated Luminescence (OSL) ages suggest a greater role of westerlies in driving the glacier advances during the MIS-2 in the southern Ladakh Ranges and are at variance with the previous suggestions that recommended monsoon driven glacier advances. The OSL ages compared to the previously obtained 10Be surface exposure ages are younger by a magnitude. The study explores probable causes for the variance in two chronologies and suggests employing multiple dating methods to minimize the uncertainty both in terms of age and climatic interpretation. AU - Shukla, Anil D. AU - Sharma, Shubhra AU - Rana, Naresh AU - Bisht, Pinkey AU - Juyal, Navin DA - 2020/02/01/ DO - 10.1016/j.palaeo.2019.109505 KW - Paleoglaciation Mid-latitude westerlies Last Glacial Maximum Luminescence dating PY - 2020 RN - glacial and periglacial SN - 0031-0182 SP - 109505 JO - Palaeogeography, Palaeoclimatology, Palaeoecology TI - Optical chronology and climatic implication of glacial advances from the southern Ladakh Range, NW Himalaya, India UR - http://www.sciencedirect.com/science/article/pii/S0031018219303220 VL - 539 ID - 13 ER - TY - JOUR AB - We present a new 52 m composite record (COL17c) composed of five sedimentary sequences retrieved from the Colônia basin (Southeastern Brazil). The COL17c record is composed of two main sub-units deposited under different regimes: a peatland above ~14 m and lacustrine sediments below. Sedimentary description and core scanning (MSCL and XRF) are first used to align individual cores in order to produce a nearly continuous composite record. We then established an original chronological framework based on radiocarbon, paleomagnetic, optically stimulated luminescence (OSL), post-infrared infrared stimulated luminescence at elevated temperature (pIRIR290°C) and authigenic 10Be/9Be dating. We describe the protocols used for each technique and discuss the positive and negative results, as well as their implications for proxy interpretation. In spite of negative results of some techniques, mainly due to the absence of adequate sample material, the multi-proxy approach used is essential to maximize the chances of obtaining a satisfactory age model for this unique continental sedimentary sequence. All valid chronological proxies, comprising three AMS 14C ages, one pIRIR290°C age, two paleomagnetic constraints and eight authigenic 10Be/9Be datum, are integrated within a Bayesian age-depth modeling to produce a 1.5 ± 0.1 Ma chronology for the whole COL17c sequence. This age model represents the first long-term chronological estimate of sediments deposition in the Colônia basin. The record allows to refine the age of the Colônia basin formation between 5.3 and 11.2 Ma, much older than previously estimated from short sedimentary cores. AU - Simon, Quentin AU - Ledru, Marie-Pierre AU - Sawakuchi, André Oliveira AU - Favier, Charly AU - Mineli, Thays D. AU - Grohmann, Carlos H. AU - Guedes, Marco AU - Bard, Edouard AU - Thouveny, Nicolas AU - Garcia, Marta AU - Tachikawa, Kazuyo AU - Rodríguez-Zorro, Paula A. DA - 2020/06/01/ DO - 10.1016/j.quageo.2020.101081 KW - Peat and lake sediments Paleomagnetism Luminescence dating Radiocarbon Authigenic Be/Be dating Deep drilling PY - 2020 RN - lacustrine SN - 1871-1014 SP - 101081 JO - Quaternary Geochronology TI - Chronostratigraphy of a 1.5±0.1 Ma composite sedimentary record from Colônia basin (SE Brazil): Bayesian modeling based on paleomagnetic, authigenic 10Be/9Be, radiocarbon and luminescence dating UR - http://www.sciencedirect.com/science/article/pii/S1871101420300303 VL - 58 ID - 148 ER - TY - JOUR AB - With increasing use of ionizing radiation and associated nuclear materials, concern arises regarding the possibility of harm from unplanned events, both to the surrounding environment as well as to its inhabitants; the Three Mile Island, Chernobyl and Fukushima Daiichi nuclear power plant incidents come to mind. Retrospective dosimetry can provide estimation of the radiation dose received from such accidents, the information allowing appropriate remedial measures to be formulated. In the affected area a number of objects can be applied as natural dosimeters. Given that the mobile phone is a device used by a large fraction of the population, investigation has been made of the suitability of the phone screen for retrospective dosimetry. Samples of five brands of phone screen were studied (Iphone, Sony, Samsung, Asus and Xiomi), investigating key thermoluminescence (TL) properties, including TL dose response, glow curves, reproducibility and long-term stability of the TL signal. Within the γ-radiation dose range up to 10 Gy, these parameters show the Iphone screen to offer best use as a suitable material for retrospective dosimetry. Reconstruction of absorbed dose is possible for a period of up to four weeks post-incident. One proviso concerns the ability to adequately correct for TL signal loss during this time. AU - Siti Rozaila, Z. AU - Khandaker, Mayeen Uddin AU - Wahib, Norfadira binti AU - Hanif bin Abdul Jilani, Mohd Khairul AU - Abdul Sani, S. F. AU - Bradley, D. A. DA - 2020/02/01/ DO - 10.1016/j.radphyschem.2019.04.047 KW - Phone screen TL dosimetric properties Iphone screen Low fading Retrospective dosimeter N1 - Special issue dedicated to the 14th International Symposium on Radiation Physics PY - 2020 RN - dosimetry SN - 0969-806X SP - 108297 JO - Radiation Physics and Chemistry TI - Thermoluminescence characterization of smartphone screen for retrospective accident dosimetry UR - http://www.sciencedirect.com/science/article/pii/S0969806X18314142 VL - 167 ID - 84 ER - TY - JOUR AB - For over 30 years, the radiometric chronologies of Newman Rockshelter and Newman Orebody XXIX have been central to archaeological discussions on the Pleistocene Aboriginal occupation of the Hamersley Plateau and greater Pilbara region. Until 2009, these two sites were heralded as having the oldest evidence of human occupation on the plateau, dating to the last glacial maximum (LGM) ∼ 26–20 ka. More recently however, the excavations at several other rockshelters have shown that ancient Aboriginal peoples occupied the Hamersley Plateau many thousands of years before the onset of the last glacial cycle, when regional climatic conditions were wetter and more amenable. This paper presents the results of our re-excavation of both Newman Rockshelter and Newman Orebody XXIX. Our research has resulted in the compilation and analysis of large lithic datasets for each of these sites and the construction of geo-chronologies using modern radiometric techniques, including AMS-radiocarbon dating and optically stimulated luminescence dating. These new radiometric chronologies and artefact data indicate that both sites were occupied between 45 and 40 ka. Despite having significant early occupational evidence, neither of the rockshelters present strong evidence for sustained or persistent site use during the LGM proper ca. 23–19 ka; however, there is substantial evidence for more routine occupation of these localities during the terminal Pleistocene and Holocene. AU - Slack, Michael Jon AU - Law, Wallace Boone AU - Gliganic, Luke Andrew DA - 2020/05/15/ DO - 10.1016/j.quascirev.2020.106240 KW - Pilbara Hamersley plateau Pleistocene occupation Optically stimulated luminescence Australian archaeology PY - 2020 RN - archaeology SN - 0277-3791 SP - 106240 JO - Quaternary Science Reviews TI - The early occupation of the Eastern Pilbara revisited: New radiometric chronologies and archaeological results from Newman Rockshelter and Newman Orebody XXIX UR - http://www.sciencedirect.com/science/article/pii/S027737911930753X VL - 236 ID - 115 ER - TY - JOUR AB - Optically stimulated luminescence (OSL) dating of single grains is often required to determine an accurate age for partially-bleached sediment by identifying those grains with OSL signals that were well bleached prior to burial. However, single-grain De distributions are typically characterised by greater amounts of scatter in comparison to multiple grains. Here we investigate the scatter in single-grain De distributions of quartz from 56 proglacial samples associated with the retreat of the last British-Irish Ice Sheet. Our findings provide the first empirical dataset showing that beta-dose heterogeneity can impact the extrinsic scatter in single-grain De distributions, in addition to partial bleaching in nature. The additional scatter in single-grain De distributions caused by beta-dose heterogeneity suggests that it is inappropriate to apply a fixed threshold to determine between well-bleached and partially-bleached De distributions, but the skewness of the De distributions could alternatively be used. Autoradiography and QEMSCAN analyses show that there was a negative relationship between the relative standard deviation (RSD) of the beta-dose heterogeneity and the beta dose-rate. This relationship offers the opportunity to infer the RSD of the beta-dose heterogeneity for each sample using just the beta dose-rate, instead of acquiring empirical data for every sample. For this large suite of sedimentary samples, we observe a minimum OD of 20% arising from the effects of beta-dose heterogeneity (Fig. 3e), which should be added (in quadrature) to the intrinsic OD to determine σb for the minimum age model (MAM) to calculate accurate OSL ages and prevent underestimation of the burial age. AU - Smedley, R. K. AU - Duller, G. A. T. AU - Rufer, D. AU - Utley, J. E. P. DA - 2020/03/01/ DO - 10.1016/j.quageo.2020.101052 KW - Optically stimulated luminescence dating Quartz Scatter Single grains Microdosimetry PY - 2020 RN - dose rate SN - 1871-1014 SP - 101052 JO - Quaternary Geochronology TI - Empirical assessment of beta dose heterogeneity in sediments: Implications for luminescence dating UR - http://www.sciencedirect.com/science/article/pii/S1871101420300017 VL - 56 ID - 33 ER - TY - JOUR AB - The sedimentary succession exposed in the Gorzów Wielkopolski area includes Eemian Interglacial (MIS 5e) or Early Weichselian (MIS 5d?e) deposits. The sedimentary sequence has been the object of intense interdisciplinary study, which has resulted in the identification of at least two palaeolake horizons. Both yielded fossil remains of large mammals, alongside pollen and plant macrofossils. All these proxies have been used to reconstruct the environmental conditions prevailing at the time of deposition, as well as to define the geological context and the biochronological position of the fauna. Optically stimulated luminescence dating of the glaciofluvial layers of the GS3 succession to 123.6?±?10.1 (below the lower palaeolake) and 72.0?±?5.2?ka (above the upper palaeolake) indicate that the site formed during the Middle?Late Pleistocene (MIS 6 ? MIS 5). Radiocarbon-dating of the lacustrine organic matter revealed a tight cluster of Middle Pleniglacial Period (MIS 3) ages in the range of ~41?32?ka cal bp (Hengelo ? Denekamp Interstadials). Holocene organic layers have also been found, with 14C ages within a range of 4330?4280?cal?bp (Neolithic). Pollen and plant macrofossil records, together with sedimentological and geochemical data, confirm the dating to the Eemian Interglacial. AU - Sobczyk, Artur AU - Borówka, Ryszard K. AU - Badura, Janusz AU - Stachowicz-Rybka, Renata AU - Tomkowiak, Julita AU - Hrynowiecka, Anna AU - Sławińska, Joanna AU - Tomczak, Michał AU - Pitura, Mateusz AU - Lamentowicz, Mariusz AU - Kołaczek, Piotr AU - Karpińska-Kołaczek, Monika AU - Tarnawski, Dariusz AU - Kadej, Marcin AU - Moska, Piotr AU - Krąpiec, Marek AU - Stachowicz, Krzysztof AU - Bieniek, Bartosz AU - Siedlik, Krzysztof AU - Bąk, Małgorzata AU - van der Made, Jan AU - Kotowski, Adam AU - Stefaniak, Krzysztof DA - 2020/05/01 DO - 10.1002/jqs.3198 KW - Eemian Interglacial OSL dating palynology and macrofossil analysis Quaternary stratigraphy radiocarbon dating IS - 4 PY - 2020 RN - lacustrine SN - 0267-8179 SP - 539-558 JO - Journal of Quaternary Science TI - Geology, stratigraphy and palaeoenvironmental evolution of the Stephanorhinus kirchbergensis-bearing Quaternary palaeolake(s) of Gorzów Wielkopolski (NW Poland, Central Europe) UR - https://doi.org/10.1002/jqs.3198 VL - 35 Y2 - 2020/05/13 ID - 118 ER - TY - JOUR AB - A mathematical formulation and its experimental validation on α-Al2O3:C for evaluating the number of OSL components has been described. The method consists of various partial bleaching steps of LM-OSL curve and as a result, the peak position (Tmax) of the resultant curve shifts if the system contains multiple components. However, for single component system the peak position of the resultant curve doesn’t change on partial bleaching for a phosphor obeying first order kinetics. The method has been theoretically formulated for single and multiple component system with different order of kinetics and validated experimentally on the commercial α-Al2O3:C OSL phosphor. The slope of the curve between shift in Tmax and bleaching time gives the number of the OSL components and measure of their closeness in terms of photoionization cross-section. Based on this result, the photoionization cross-section of the two embedded peaks in the LM-OSL curve of α-Al2O3:C were found to be 1.51×10−18cm2 and 5.02×10−19cm2 using CW-OSL and NL-OSL method. AU - Soni, Anuj AU - Mishra, D. R. DA - 2016/05/15/ DO - 10.1016/j.nimb.2016.03.039 KW - LM-OSL Photoionization cross-section α-AlO:C PY - 2016 RN - basic research SN - 0168-583X SP - 87-92 JO - Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms TI - Mathematical formulation of Tmax–Tstop method for LM-OSL and its experimental validation on α-Al2O3:C UR - http://www.sciencedirect.com/science/article/pii/S0168583X16300131 VL - 375 ID - 7 ER - TY - JOUR AB - The impetus behind this study is to understand the sedimentological dynamics of very young fluvial systems in the Amazon River catchment and relate these to land use change and modern analogue studies of tidal rhythmites in the geologic record. Initial quartz optically stimulated luminescence (OSL) dating feasibility studies have concentrated on spit and bar deposits in the Rio Tapajós. Many of these features have an appearance of freshly deposited pristine sand, and these observations and information from anecdotal evidence and LandSat imagery suggest an apparent decadal stability. The characteristics of OSL from small (~5 cm) sub-samples from ~65 cm by ~2 cm diameter vertical cores are quite remarkable. Signals from medium-sized aliquots (5 mm diameter) exhibit very high specific luminescence sensitivity, have excellent dose recovery and recycling, essentially independent of preheat, and show minimal heat transfer even at the highest preheats. These characteristics enable measurement of very small signals with reasonable precision and, using modified single-aliquot regenerative-dose (SAR) approaches, equivalent doses as low as ~4 mGy can be obtained. Significant recuperation is observed for samples from two of the study sites and, in these instances, either the acceptance threshold was increased or growth curves were forced through the origin; recuperation is considered most likely to be a measurement artefact given the very small size of natural signals. Dose rates calculated from combined inductively coupled plasma mass spectrometry/inductively coupled plasma optical emission spectrometry (ICP-MS/ICP-OES) and high-resolution gamma spectrometry range from ~0.3 to 0.5 mGya−1, and OSL ages for features so far investigated range from 13 to 34 years to several 100 years. Sampled sands are rich in quartz and yields of 212–250 μm or 250–310 μm grains indicate high-resolution sampling at 1–2 cm intervals is possible. Despite the use of medium-sized aliquots to ensure the recovery of very dim natural OSL signals, these results demonstrate the potential of OSL for studying very young active fluvial processes in these settings. AN - 10.3390/mps2040090 AU - Spencer, Joel Q. G. AU - Huot, Sébastien AU - Archer, Allen W. AU - Caldas, Marcellus M. IS - 4 PY - 2019 RN - fluvial SN - 2409-9279 SP - 90 JO - Methods and Protocols TI - Testing luminescence dating methods for small samples from very young fluvial deposits UR - https://www.mdpi.com/2409-9279/2/4/90 VL - 2 ID - 9 ER - TY - JOUR AB - Due to the scarcity of geochemical and palaeoecological proxies in drylands, dunes have often been used as geoproxies for late Quaternary palaeoenvironmental reconstruction, with chronologies commonly provided by luminescence dating. Owing to their widespread occurrence and location in a monsoonal regime, dunes in the Thar Desert in South Asia act as important archives of past landscape change. Previous reviews have assimilated dune age data from the Thar and suggested a temporally and spatially complex record of sediment accumulation over the last ∼70 ka. New luminescence age data presented in this study and from recent dunefield based investigations demonstrate a stronger Holocene record of dune building in parts of the Thar than previously suggested. In this study, the Accumulation Intensity (AI) methodology is applied to new and old data sets, providing records of dune accumulation that can be analysed alongside other palaeoenvironmental records. AI analysis demonstrates the significance of Holocene dune accumulation in the Thar landscape, with accumulation peaks observed between ∼12 and ∼8 ka, centred around ∼7, ∼5 and ∼3.5 ka, and in last two millennia. The strengthening of the Indian Summer Monsoon remains a significant influence on widespread dune accumulation in the early Holocene, but dunefields have also shown diverse and spatially intensive responses to sediment supply and anthropogenic disturbances during the late Holocene. Additionally, aeolian-fluvial sequences associated with the Ghaggar-Hakra palaeochannel along the northern margin of the Thar also display dynamic geomorphic behaviour during the Holocene. The integration and interpretation of the AI data with published, highly resolved geochemical proxies of palaeoclimate, shows a complex relationship between geoproxy and geochemical records. We suggest that process studies of geomorphologic systems and their diverse responses to the same environmental stimuli must be given due consideration before deriving palaeoenvironmental interpretations. Despite the presence of over a hundred Holocene dune records from the Thar, there still remains marked spatial and temporal gaps. Further intensive investigations of distinct dunefields with a strong chronometric framework and geomorphological grasp are required to gain significant insights into wider Thar landscape and palaeoenvironmental dynamics. AU - Srivastava, Aayush AU - Thomas, David S. G. AU - Durcan, Julie A. AU - Bailey, Richard M. DA - 2020/04/01/ DO - 10.1016/j.quascirev.2020.106214 KW - Thar desert Holocene Dune accumulation Accumulation intensity Palaeoenvironmental change PY - 2020 RN - aeolian SN - 0277-3791 SP - 106214 JO - Quaternary Science Reviews TI - Holocene palaeoenvironmental changes in the Thar Desert: An integrated assessment incorporating new insights from aeolian systems UR - http://www.sciencedirect.com/science/article/pii/S0277379119309023 VL - 233 ID - 67 ER - TY - JOUR AB - Understanding Holocene paleoclimate in arid Central Asia (ACA) is helpful for predicting future climate. However, Holocene climate patterns and their forcing mechanisms across ACA are vigorously debated in the context of global climate change. Here, we present a Holocene loess profile (SGX) from the Ili Basin in the Westerlies-dominated Central Asia. Based on high-resolution, medium-grained (38–63 μm) quartz optically stimulated luminescence (OSL) dating, and grain size and color measurements, we reconstruct the Holocene paleoclimate. OSL geochronology indicate that this SGX loess profile covers the last 11.5 ka, and grain size analyses reveal that the sediments are sandy loess, and the environmentally sensitive fractions are <35.6 μm and 35.6–252 μm, which represent suspensions after dust storms and proximal deposit components transported mainly during dust storms, respectively. And the redness and yellowness in the loess profile are closely related to the concentrations of hematite (Hm) and goethite (Gt); the ratio Hm/Gt also can be used to reflect the evolution of dry/humid conditions in Central Asian loess. The Holocene Westerlies-dominated climate in ACA is characterized by a dry early Holocene, persistently wet conditions in the middle and late Holocene, and a climatic optimum in the late Holocene. The winter solar insolation at 60°N is considered the major forcing of Holocene climate evolution in ACA. AU - Sun, Huanyu AU - Song, Yougui AU - Chen, Xiuling AU - Cheng, Liangqing AU - Liu, Huifang DA - 2020/07/15/ DO - 10.1016/j.palaeo.2020.109731 KW - OSL ages Grain size Color index Loess Tianshan Mountains PY - 2020 RN - loess SN - 0031-0182 SP - 109731 JO - Palaeogeography, Palaeoclimatology, Palaeoecology TI - Holocene dust deposition in the Ili Basin and its implications for climate variations in Westerlies-dominated Central Asia UR - http://www.sciencedirect.com/science/article/pii/S0031018220301760 VL - 550 ID - 144 ER - TY - JOUR AB - In this study, we explored the possibility of photo- and photo-thermal depletion of deep traps in anion-deficient corundum (α-Al2O3-δ) crystals and luminescent storage dosimeters on their basis. As a result of repeated normal use or a single exposure to high-dose radiation, these traps become filled, which reduces significantly the informative response of thermally and optically stimulated luminescence (TL and OSL) due to the depletion of the main dosimetric trap. It has been found that effective photodepletion of the deep trap causing the 830 K TL peak, whose filling affects the informative TL and OSL responses most of all, is only possible in α-Al2O3-δ crystals and unpacked TLD-500 detectors on their basis. In the majority of cases, including practically important ones associated with the restoration of the dosimetric properties of widely employed α-Al2O3-δ dosimeters, photothermal depletion proves to be more effective. AU - Surdo, A. AU - Abashev, R. AU - Milman, I. DA - 2020/03/15/ DO - 10.1016/j.nimb.2020.02.004 KW - Anion-deficient corundum Deep traps Photo- and photo-thermal depletion High-temperature thermoluminescence PY - 2020 RN - dosimetry SN - 0168-583X SP - 97-101 JO - Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms TI - On the possibility of photo- and photo-thermal depletion of deep traps in α-Al2O3-δ UR - http://www.sciencedirect.com/science/article/pii/S0168583X20300495 VL - 467 ID - 43 ER - TY - JOUR AB - Late Quaternary fluvial deposits along the Janauri (JA; comprises Siwalik rocks) and Bhaddi (BA; dominantly of Quaternary deposits) anticlines over independent fault segments of the Himalayan Frontal Thrust (HFT), Kangra re-entrant, were studied to deduce the timing and causes of the Beas-Satluj rivers deflections. The deposits, 4–60 m thick, were documented from the northwestern fringe of the JA (Site-1), between JA and BA (Site-2) and entire BA (Site-3), and along the present course of the Satluj River (Site-4) in the piggyback Soan Dun. They comprise quartzite-bearing gravels and multistorey sheet sand bodies with large-scale trough cross-stratification and are deposited by the Beas (Site-1) and Satluj (Sites 2–4) rivers. The deposits at Sites 1–3 are uplifted, tilted or folded, whereas, horizontally bedded at Site-4. Based on quartz Optically Stimulated Luminescence chrono-stratigraphy, the aggradation phase is bracketed between >46.4 ± 2.9 and 37.4 ± 2.3 ka (Site-1), >69.9 ± 4.5 and 26.1 ± 2.6 ka (Site-2) and >55.2 ± 1.7 and 50.3 ± 3.5 ka (Site-3). The terrace deposits at Site-4 were formed around 26, 11 and 6 ka. The sedimentation (9.9 to 2.7 mm yr−1 between 61.8 and 26 ka) and uplift (3.4 ± 0.3 mm yr−1 over a period of 44 ka) rates along HFT show that the latter exceeds the aggradation rate with time. It is envisaged that time variable tectonic movements along independent fault segments of the HFT forced river deflection and termination of deposition at Sites 1–3, however, the absence of any forced aggradation at the Site-4 concomitant with Site-2 termination suggests it is also governed by climate. AU - Suresh, N. AU - Kumar, Rohtash DA - 2020/04/15/ DO - 10.1016/j.jseaes.2020.104248 KW - Late Quaternary Beas-Satluj rivers River deflection Luminescence dating Growing anticline Himalayan Frontal Thrust PY - 2020 RN - fluvial SN - 1367-9120 SP - 104248 JO - Journal of Asian Earth Sciences TI - Late Quaternary Deflections of the Beas-Satluj rivers at the Himalayan mountain front, Kangra re-entrant, India: Response to fold growth and climate UR - http://www.sciencedirect.com/science/article/pii/S1367912020300237 VL - 191 ID - 179 ER - TY - JOUR AB - In this study, a method of calculating the incident photon energy from the absorbed dose ratio for different layers in a stacked thermoluminescence dosimeter (TLD) was developed. The absorbed doses for stacked TLD layers were calculated by Monte Carlo simulation for photons of various energies, and it was determined whether an approximate effective energy can be estimated based on the relationship between the incident photon energy and the absorbed dose ratio for different layer pairs. The results demonstrate that the effective energy can be estimated with reasonable accuracy using this method. AU - Takagi, Hitomi AU - Yanagisawa, Shin AU - Koba, Yusuke AU - Shinsho, Kiyomitsu DA - 2020/04/01/ DO - 10.1016/j.radmeas.2020.106283 KW - TLD Energy dependence Monte Carlo Eye lens dose PY - 2020 RN - dosimetry SN - 1350-4487 SP - 106283 JO - Radiation Measurements TI - Basic study of an effective energy measurement method using a stacked thermoluminescence dosimeter UR - http://www.sciencedirect.com/science/article/pii/S1350448720300470 VL - 133 ID - 96 ER - TY - JOUR AB - Due to the general lack of other high-resolution paleoclimate records, loess-paleosol sequences are crucial archives for disentangling past climate variability in southeastern Europe. Here we present results of a multi proxy sedimentological and geochemical investigation of Kurortne loess-paleosol section from southwestern Ukraine, coupled with detailed optically stimulated luminescence (OSL) dating. OSL investigations were carried out on quartz grains of different grain sizes (4–11 μm, 63–90 μm and 90–125 μm), using the single aliquot regenerative (SAR) protocol. The OSL dating results are in line with previous findings on dating loess-paleosol sequences along the Black Sea shore in Romania, as well as worldwide: (i) ages obtained on different grain sizes are in agreement for equivalent doses of less than 200 Gy, whereas for higher equivalent doses 4–11 μm ages underestimate the coarser fraction ages; and (ii) an inverse correlation between dated grain size fractions and saturation characteristics is reported. Our combined dating and sedimentological approach would confirm that the investigated uppermost 4.5 m at Kurortne cover the Last Glacial Cycle, adding important data in better constraining local and regional chronostratigraphic correlations. The application of the SAR protocol on 63–90 μm quartz grains on samples collected from the lower part of S1 soil (the Kaydaky unit) and from the Kaydaky/Pryluky units boundary produced ages of 123 ± 10 ka and 85 ± 6 ka, respectively. As the temporal range covered by these units in the Ukrainian Quaternary stratigraphic framework is still debatable, our results confirm the broad correlation of the Kaydaky-Pryluky paleosol units at Kurortne with the last interglacial (i.e., MIS 5). Dating the Uday and Bug loess units produced ages corresponding to MIS 4 and MIS 2, respectively, whereas the sample collected from the Vytachiv unit provided an age of 37.7 ± 2.4 ka, assigning this paleosol to MIS 3. On the basis of trends in the magnetic enhancement, the onset of pedogenetic processes likely commenced already around 20 ka, but the formation of the topmost S0 soil has begun after 13.8 ± 1.0 ka. AU - Tecsa, Viorica AU - Gerasimenko, Natalia AU - Veres, Daniel AU - Hambach, Ulrich AU - Lehmkuhl, Frank AU - Schulte, Philipp AU - Timar-Gabor, Alida DA - 2020/03/20/ DO - 10.1016/j.quaint.2020.03.001 KW - Loess chronostratigraphy OSL dating Last glacial cycle SE Europe Ukraine PY - 2020 RN - loess SN - 1040-6182 SP - 65-79 JO - Quaternary International TI - Revisiting the chronostratigraphy of Late Pleistocene loess-paleosol sequences in southwestern Ukraine: OSL dating of Kurortne section UR - http://www.sciencedirect.com/science/article/pii/S1040618220300860 VL - 542 ID - 111 ER - TY - JOUR AB - Loess deposits of the central Great Plains, USA, and their intercalated soils provide a detailed record of climatically driven changes within the aeolian system during the Pleistocene-Holocene transition and the Holocene. Here we present a detailed optically stimulated luminescence (OSL) chronology as well as multi-proxy analysis obtained for the first time on the Enders section, located in southwestern Nebraska, central Great Plains. The section records multiple episodes of rapid loess deposition alternating with soil formation. Rapid accumulation of Late Pleistocene Peoria Loess was replaced around 13–14 ka by formation of the Brady Soil until 9.5 ± 0.6 ka. The Holocene Bignell Loess then buried the Brady Soil and accumulated episodically throughout the Holocene. The loess-paleosol stratigraphy since the Late Pleistocene at the Enders site is very similar to that at other sites in western Nebraska, and the newly developed OSL chronology (based on three grain size classes) adds new confidence to earlier dating. The high-resolution grain size profile from Enders shares many features with similar data from the previously studied Wauneta site, including three peaks of fine-grained material just above and within the Brady Soil, likely representing response to millennial-scale climatic changes during the Pleistocene-Holocene transition. This study demonstrates the potential for developing high-resolution, well-dated paleoclimatic records from the loess of the central Great Plains. Contrasts between Great Plains and Eurasian loess records reflect differences in the Late Pleistocene to Holocene climatic evolution and other factors influencing the loess system. AU - Tecsa, Viorica AU - Mason, Joseph A. AU - Johnson, William C. AU - Miao, Xiaodong AU - Constantin, Daniela AU - Radu, Stelian AU - Magdas, Dana A. AU - Veres, Daniel AU - Marković, Slobodan B. AU - Timar-Gabor, Alida DA - 2020/02/01/ DO - 10.1016/j.quascirev.2019.106130 KW - Holocene Loess Optically stimulated luminescence dating Grain size Magnetic susceptibility Stable isotopes Brady soil PY - 2020 RN - loess SN - 0277-3791 SP - 106130 JO - Quaternary Science Reviews TI - Latest Pleistocene to Holocene loess in the central Great Plains: Optically stimulated luminescence dating and multi-proxy analysis of the enders loess section (Nebraska, USA) UR - http://www.sciencedirect.com/science/article/pii/S0277379119305967 VL - 229 ID - 25 ER - TY - JOUR AB - Ancient agricultural systems in the Negev Desert preserves abundant evidence of dryland farming from the Roman, Byzantine and Early Islamic periods. These systems consist of dams, field plots, field towers, cisterns and thousands of human-made stone mounds. In the environment of Shivta, these systems also included built dovecotes to produce dung to fertilize vineyards and orchards. All of these elements established an intensive agronomic practice. Extensive survey and excavations in one completely preserved agricultural system in a small wadi in the hinterland of Shivta, followed by OSL dating of loess accumulations in the adjacent agricultural installations, in addition to dates from archaeological finds, revealed clear stratigraphic and chronological sequences. We found that the first human-made components were established in the Roman period (1st–2nd centuries CE) and the agricultural system flourished during the Byzantine period (5th–6th centuries CE) before it was abandoned in the post-Byzantine era. At its peak, all artificial components of the system would have had to operate together at an optimum level to make intensive agriculture possible. This agricultural system is a prime example of the enormous skill and knowledge of Shivta farmers in synergizing different agricultural installations to maintain agriculture in a desert environment. AU - Tepper, Yotam AU - Porat, Naomi AU - Bar-Oz, Guy DA - 2020/06/01/ DO - 10.1016/j.jaridenv.2020.104134 KW - Desert agronomy Landscape modification Negev desert Roman-Byzantine periods Sustainable agriculture PY - 2020 RN - archaeology SN - 0140-1963 SP - 104134 JO - Journal of Arid Environments TI - Sustainable farming in the Roman-Byzantine period: Dating an advanced agriculture system near the site of Shivta, Negev Desert, Israel UR - http://www.sciencedirect.com/science/article/pii/S0140196320300471 VL - 177 ID - 51 ER - TY - JOUR AB - The optically stimulated luminescence (OSL) and thermoluminescence (TL) signals of an Al2O3:C,Mg single crystal were investigated as a function of the heating temperature and illumination time before readout, respectively. The TL and OSL results were analyzed in complementary ways, including the area under the curve, whole range and partial integration, and peak intensity. A correlation between the continuous decay of the main TL peak intensity (at 185 °C at a heating rate of 1 °C/s) against blue light (470 nm) illumination times and the decay of the OSL signal for higher temperatures was found. Both these results showed that the emptying of the OSL active trap was closely related to the emptying of the trap related to the main TL peak, indicating a correlation of both phenomena. AU - Trindade, Neilo Marcos AU - Jacobsohn, Luiz Gustavo AU - Yoshimura, Elisabeth Mateus DA - 2019/02/01/ DO - 10.1016/j.jlumin.2018.10.084 KW - AlO:C,Mg OSL Thermoluminescence PY - 2019 RN - basic research SN - 0022-2313 SP - 298-301 JO - Journal of Luminescence TI - Correlation between thermoluminescence and optically stimulated luminescence of α-Al2O3:C,Mg UR - http://www.sciencedirect.com/science/article/pii/S0022231318312407 VL - 206 ID - 3 ER - TY - JOUR AB - Early European plucked instruments have recently experienced a great revival, but a few aspects remain unknown (e.g., the gauge of gut strings). Here we report, for the first time, that the electron spin resonance (ESR) signal intensity of oxidized iron, Fe(III), from gut strings at g = 2 increases linearly with age within a few hundred years. The signal increase in the remaining old strings on early instruments can be used to judge if they are as old as or younger than the instrument. Obtaining the authenticity information of gut strings contributes to the revival of the old instruments and the music. AU - Tsukamoto, Sumiko AU - Takeuchi, Taro AU - Tani, Atsushi AU - Miyairi, Yosuke AU - Yokoyama, Yusuke DO - 10.3390/mps3010013 KW - ESR gut strings Fe(III) early plucked instruments radiocarbon IS - 1 PY - 2020 RN - archaeology ESR SN - 2409-9279 SP - 13 JO - Methods and Protocols TI - ESR and radiocarbon dating of gut strings from early plucked instruments VL - 3 ID - 129 ER - TY - JOUR AB - The Badain Jaran Desert (BJD) in NW China is well known for its unique landscape of megadunes coexisting with permanent lakes. The megadunes are already the tallest sand dunes on earth, and some of them are up to 400 m high. However, it is unclear whether or not the height of the megadunes is continuing to increase under present climatic and environmental conditions. In order to determine the growth status of the megadunes, we collected 26 samples from the windward slopes of two megadunes for optically stimulated and infrared stimulated luminescence dating. The results show that the thickness of the modern eolian sand layers increases from the lower part of the windward slopes, with a thickness of less than 1 m, to more than 2 m in the middle, and to 9 m in the upper part. This indicates that the height of the megadunes is continuing to increase under modern conditions. The surface sediments from the base of the windward slope and the adjacent lake basin have relatively old ages of 6–7 ka, indicating that these areas are eroding. The recent eolian sands of the upper part of the megadunes likely originated from the base of the dunes or from the lake basin. The megadunes in the BJD are currently becoming increasingly high and steep due to the upward migration and accumulation of sand particles. Increased humidity and a weakened wind regime in northern China, related to ongoing climatic warming, are likely the main factors in maintaining the growth of the megadunes. AU - Wang, Xingfan AU - Zhao, Hui AU - Yang, Hongyu AU - Wang, Keqi DA - 2019/11/01/ DO - 10.1016/j.jseaes.2019.104025 KW - Optical dating Badain Jaran Desert Megadunes Growth PY - 2019 RN - aeolian SN - 1367-9120 SP - 104025 JO - Journal of Asian Earth Sciences TI - Optical dating reveals that the height of Earth’s tallest megadunes in the Badain Jaran Desert of NW China is increasing UR - http://www.sciencedirect.com/science/article/pii/S1367912019303773 VL - 185 ID - 123 ER - TY - JOUR AB - Slope deposits with aeolian silt admixture are a widespread parent material of soils in the temperate zone but may be neglected when rates of soil production are quantified. The concept of periglacial cover beds differentiates slope deposits with or without aeolian silt admixture; yet there is a remaining debate on processes and the timing of their formation. A previous study done by us at Mt. Ślęża, SW Poland, concluded that slope deposits with variable aeolian silt admixture, or its lack, have a significant influence on the pathway of soil formation. The present work builds upon this finding, by adding further granulometric and micromorphological data from three representative profiles along a toposequence, in order to refine our understanding of local slope deposits and soil formation. Additionally, seven numerical ages using luminescence dating provide a chronological framework for our reconstructions and allow linking the forming processes of these pedosedimentary records to regional palaeoenvironmental conditions. The oldest aeolian deposits are of Middle Pleistocene age (>280 ± 19 ka) with interlayered palaeosol (marine isotope stage [MIS] 9 or older). Late Pleistocene slope deposits encompass the maximum loess thickness and are dated to MIS 2. Luminescence ages from the upper layers indicate shallow reworking, which we tentatively correlate to the Younger Dryas (YD). Two profiles with thick loess mantles have strong clay illuviation features, presumably formed during the Holocene. However, weak clay illuviation in the third profile with a thin loess mantle (having an age of YD) over granite regolith seems to have occurred before the Holocene, as only fragmented clay coatings (probably MIS 2 pedogenesis) could be found. AU - Waroszewski, Jaroslaw AU - Sprafke, Tobias AU - Kabala, Cezary AU - Musztyfaga, Elżbieta AU - Kot, Aleksandra AU - Tsukamoto, Sumiko AU - Frechen, Manfred DA - 2020/07/01/ DO - 10.1016/j.catena.2020.104549 KW - Quaternary Pedogenesis Loess Slope sediments OSL dating PY - 2020 RN - loess SN - 0341-8162 SP - 104549 JO - CATENA TI - Chronostratigraphy of silt-dominated Pleistocene periglacial slope deposits on Mt. Ślęża (SW, Poland): Palaeoenvironmental and pedogenic significance UR - http://www.sciencedirect.com/science/article/pii/S0341816220300990 VL - 190 ID - 70 ER - TY - JOUR AB - In the present work, carbonate samples covering wall painting of four points in the same site found at Peruaçu National Park in the extreme northwest of the state of Minas Gerais, Brazil, has been investigated and dated by thermoluminescence (TL) and electron paramagnetic resonance (EPR) techniques. The EPR spectrum of the carbonate samples presented the typical six signals due to Mn2+ ion and signals around g~2.0 due to SO2- and CO2-. The thermal stability and dose response of the EPR signals were found to be suitable for an age determination using the center due to CO2-. The carbonate sample exhibits TL peaks at approximately 350 °C. TL and EPR dating of the carbonate samples that covered the cave paintings gave an age of 33.13 to 48.40 ka. This series of dating data indicate that in the region about 220-250 km from the coast and extending from the State of Piaui, Bahia to Minas Gerais people lived around 50000 years ago. AU - Watanabe, Shigueo AU - Cano, Nilo F. AU - Carvalho-Júnior, Alvaro B. AU - Ayala-Arenas, Jorge S. AU - Gonzales-Lorenzo, Carlos D. AU - Rao, T. K. Gundu DA - 2019/11/01/ DO - 10.1016/j.apradiso.2019.108847 KW - Dating Calcite TL EPR First settlers PY - 2019 RN - ESR cave archaeology SN - 0969-8043 SP - 108847 JO - Applied Radiation and Isotopes TI - Dating of carbonate covering cave paintings at peruaçu, Brazil by TL and EPR methods UR - http://www.sciencedirect.com/science/article/pii/S0969804318306584 VL - 153 ID - 87 ER - TY - JOUR AB - Three quartz samples extracted from different origins were collected for ESR evaluation to appreciate the optical bleaching characteristics of the E1’ centre in a long time scale. After exposure of about 400 hours to artificial sunlight, the E1’ centre were bleached to a steady increasing level, about 2.5 times of its natural level, and the increase level also exhibit a small variability among different sample origins. The constant increasing level provide a significantly evidence for the potential use of the natural signal intensities of quartz E1’ centre in tracing sediment provenance. The results show that the signal intensity of E1’ centre increased within beginning 84 h and decreased after 202 h as previous researches have partly predicted. After long time exposed to sunlight, there is no correlation between irradiated samples’ dose rate and its E1’ centre ESR signal intensity. Thus, no new convenient indication shed light on the possible use of the E1’ centre for ESR sediment dating. AU - Wei, Chuan-Yi AU - Liu, Chun-Ru AU - Li, Chang-An AU - Yin, Gong-Ming AU - Zhang, Yu-Fen AU - Li, Wen-Peng AU - Yu, Lu-Peng DO - 10.1515/geochr-2015-0106 LA - English IS - 1 PY - 2019 RN - ESR SP - 79-86 JO - Geochronometria TI - Application of long time artificial optical bleaching of the E1’ centre to sediment ESR dating UR - https://content.sciendo.com/view/journals/geochr/46/1/article-p79.xml VL - 46 ID - 105 ER - TY - JOUR AB - In a recent study using pulsed stimulation we revealed that optically stimulated luminescence (OSL) and photo-transferred thermoluminescence (PTTL) in quartz are characterised by a common pulse response. We interpreted this result as indicating that both emissions are governed by the same detrapping mechanisms. In the present study we develop a common configurational coordinate model to describe the mechanisms. Within our model we identify the energy associated with the thermal assistance effect as the vibrational energy of the ground state of the dimer that represents the trap. Further, we model the OSL stimulation process as an optical transition between a vibrationally-excited ground state level and a dimer excited state. By introducing additional luminescence parameters, we reveal that the processes that underlie thermal quenching and the room temperature OSL response to pulsed stimulation can be represented by competing modes which empty the excited state. In particular, we find that the room temperature pulse response can be modelled in terms of an optical transition from the excited state to a lower antibonding level from which a hole is ejected. In contrast, thermal quenching is explained by excited state vibrational dissociation at large dimer component separations. AU - Williams, Owen M. AU - Spooner, Nigel A. DA - 2020/03/01/ DO - 10.1016/j.radmeas.2020.106259 KW - Pulsed optically stimulated luminescence in quartz Hole untrapping mechanisms Configurational coordinate diagrams Thermal assistance Room temperature pulse time constants Thermal quenching PY - 2020 RN - basic research SN - 1350-4487 SP - 106259 JO - Radiation Measurements TI - Quartz optically stimulated luminescence configurational coordinate model UR - http://www.sciencedirect.com/science/article/pii/S1350448720300238 VL - 132 ID - 74 ER - TY - JOUR AB - Rivers with discontinuous watercourses are part of the spectrum of river diversity. Chain-of-ponds types contain irregularly spaced, steep-sided ponds that are separated by preferential flow paths on swampy valley fill. They often contain endangered ecological communities and are receiving greater attention for conservation and restoration. Very little is known about how these river types form, how they have evolved and how they function. Here we present the Late-Quaternary evolution of one of the last remaining large-scale chain-of-ponds systems in Australia, the Mulwaree Ponds. The chain-of-ponds was fully formed by 4.5?ka, with the position and alignment of the ponds being related to the position of pools of a palaeo-river that is up to 100?ka?old. Contemporary hydrogeomorphic processes are insufficient to create the ponds, but sufficient to maintain and keep them open. The phases of evolution for this chain-of-ponds system are synchronous with Late-Quaternary changes in fluvial activity documented for other rivers in southeastern Australia. The ponds at Mulwaree have significant preservation potential over thousands of years. In the current landscape they are rare forms, providing significant grounds for conservation and protection of their distinctive geodiversity. ? 2020 John Wiley & Sons, Ltd. AU - Williams, Rory T. AU - Fryirs, Kirstie A. DA - 2020/06/30 DO - 10.1002/esp.4842 KW - discontinuous watercourse isolated wetland Quaternary geodiversity river conservation IS - 8 PY - 2020 RN - fluvial SN - 0197-9337 SP - 1732-1748 JO - Earth Surface Processes and Landforms TI - The morphology and geomorphic evolution of a large chain-of-ponds river system UR - https://doi.org/10.1002/esp.4842 VL - 45 Y2 - 2020/06/29 ID - 137 ER - TY - JOUR AB - The introduction of agriculture is known to have profoundly affected the ecological complexion of landscapes. In this study, a rapid transition from C3 to C4 vegetation is inferred from a shift to higher stable carbon (13C/12C) isotope ratios of soils and sediments in the Benoué River Valley and upland Fali Mountains in northern Cameroon. Landscape change is viewed from the perspective of two settlement mounds and adjacent floodplains, as well as a rock terrace agricultural field dating from 1100 cal yr BP to the recent past (<400 cal yr BP). Nitrogen (15N/14N) isotope ratios and soil micromorphology demonstrate variable uses of land adjacent to the mound sites. These results indicate that Early Iron Age settlement practices involved exploitation of C3 plants on soils with low δ15N values, indicating wetter soils. Conversely, from the Late Iron Age (>700 cal yr BP) until recent times, high soil and sediment δ13C and δ15N values reflect more C4 biomass and anthropogenic organic matter in open, dry environments. The results suggest that Iron Age settlement practices profoundly changed landscapes in this part of West Africa through land clearance and/or utilization of C4 plants. AU - Wright, David K. AU - MacEachern, Scott AU - Ambrose, Stanley H. AU - Choi, Jungyu AU - Choi, Jeong-Heon AU - Lang, Carol AU - Wang, Hong DB - Cambridge Core DO - 10.1017/qua.2019.25 DP - Cambridge University Press ET - 06/28 KW - Holocene Savanna West Africa Agriculture Anthropogenic soils Niche construction Soil carbon Nitrogen isotopes IS - 2 PY - 2019 RN - archaeology SN - 0033-5894 SP - 323-339 JO - Quaternary Research TI - Iron Age landscape changes in the Benoué River Valley, Cameroon UR - https://www.cambridge.org/core/article/iron-age-landscape-changes-in-the-benoue-river-valley-cameroon/E21A2D295B6E99E01D7DBD2D45AACD93 VL - 92 ID - 162 ER - TY - JOUR AB - Ongoing global warming will have a significant impact on terrestrial water resources, especially in arid and semi-arid regions. Assessing changes in the hydrology and water resources in inland basins under a warm climate in the recent geological past can provide a valuable context for assessing their current and possible future status. Here we present a record from a rapidly-accumulating sediment core from Lake Dalianhai in the Gonghe Basin in the northeastern Tibetan Plateau. The chronology of the uppermost 51.63 m of the core is based on AMS 14C dates from 11 samples of terrestrial plant microfossils and 14 bulk samples. Hydroclimatic variations within the basin during the last 23,000 yr were reconstructed from sedimentological and geochemical parameters and paleoshoreline records. The results indicate that the Gonghe Basin experienced relatively arid conditions during 23,000-14,700 cal yr BP. Lake Dalianhai was refilled at 14,700 cal yr BP and a high lake level was sustained until the beginning of the Holocene, as indicated by changes in the concentration of OH-GDGTs. However, the lake level was low during the early to middle Holocene (11,700-4700 cal yr BP) and increased during the late Holocene. Based on a comparison with lake level records and aeolian sand deposits from the region, we conclude that the climate was extremely dry in basins in the northeastern Tibetan Plateau during the early to middle Holocene. We propose that strong evaporation combined with high summer temperatures during the early to middle Holocene were responsible for the dry climate at that time, rather than changes in mid-latitude precipitation. Given the situation occurred during the early to middle Holocene, ongoing global warming may seriously threaten water resources in inland China, even if precipitation increases substantially. AU - Wu, Duo AU - Zhou, Aifeng AU - Zhang, Jiawu AU - Chen, Jianhui AU - Li, Guoqiang AU - Wang, Qiang AU - Chen, Lin AU - Madsen, David AU - Abbott, Mark AU - Cheng, Bo AU - Chen, Fahu DA - 2020/06/01/ DO - 10.1016/j.quascirev.2020.106311 KW - Tibetan plateau Lake Dalianhai Holocene Lake level Temperature Dry climate PY - 2020 RN - lacustrine SN - 0277-3791 SP - 106311 JO - Quaternary Science Reviews TI - Temperature-induced dry climate in basins in the northeastern Tibetan Plateau during the early to middle Holocene UR - http://www.sciencedirect.com/science/article/pii/S0277379120302730 VL - 237 ID - 142 ER - TY - JOUR AB - The Tuoji II (TJII) section on the Miaodao Islands in the Bohai Sea is a representative aeolian section off China’s east coast. This study applied optically stimulated luminescence (OSL) dating, conducted grain size analysis, and examined major and trace element compositions, to investigate the loess–paleosol sequences. The OSL ages at depths of 0.6, 1.8, 2.8, 3.8, and 4.8m were determined as 14.4±0.4, 16.7±1.3, 20.8±1.0, 40.9±1.5, and 47.9±3.7ka, respectively. It was projected that the loess started to accumulate at ca. 62.6ka, according to presumed depositional rates. In this study, typical aeolian deposits elsewhere including the Luochuan (LC), Xiashu (XS), Wushan (WS), and Xifeng (XF) sections were compared with TJII section here. The results showed similarity in the geochemical characteristics of the deposits from the different areas of China and normalized upper continental crust, indicating aeolian origin of this island loess. In comparison with the LC, XS, WS, and XF samples, the aeolian deposits of the TJII section have higher concentrations of TiO2 and Zr and lower concentrations of Al2O3, Rb, and Ni, and they have higher SiO2/Al2O3 and TiO2/Al2O3 ratios and lower Al2O3/Na2O and Ba/Sr ratios. These features indicate the dust materials of the TJII section were derived from local sources of well-mixed sedimentary protoliths. Our results support the suggestion that paleoclimatic change and the evolution of aeolian sediments were controlled primarily by variation of the East Asian summer monsoon and sea level change. AU - Xu, Shujian AU - Kong, Fanbiao AU - Jia, Guangju AU - Miao, Xiaodong AU - Ding, Xinchao DA - 2018/04/01/ DO - 10.1016/j.aeolia.2017.07.007 KW - Loess on Tuoji Island Luminescence dating Geochemical element Grain size Paleoclimatic evolution N1 - INQUA LoessFest 2016: Western Wisconsin PY - 2018 RN - loess SN - 1875-9637 SP - 105-116 JO - Aeolian Research TI - An integrated OSL chronology, sedimentology and geochemical approach to loess deposits from Tuoji Island, Shandong Province: Implications for the late quaternary paleoenvironment in East China UR - http://www.sciencedirect.com/science/article/pii/S1875963717300654 VL - 31 ID - 92 ER - TY - JOUR AB - Understanding past human-environment interactions over a long time-scale offers an analogue to predict, adapt and mitigate the environmental issues caused by global change and human activities in the future. The transient existence of historical cities from arid northern China can provide a valuable reference for this issue. In this study, we investigated a set of sand dunes which accumulated alongside the city wall of South Heishuiguo ancient city (SHC) from the middle Hexi Corridor in arid northern China. Dating these dune sands can provide the timing of both desertification and city abandonment. A series of sand samples (a total of 20) were collected, and their ages were determined by luminescence dating of K-feldspar fraction. The results suggest an abrupt sand dune accumulation between 0.40 ± 0.03 ka and 0.25 ± 0.02 ka, corresponding to 1590–1790 CE. This study confirms a phase of desertification between the late 16th century and the late 18th century in the Hexi Corridor, and the abandonment of the SHC at the ~17th century. In order to assess the anthropogenic influences on desertification, we also reconstructed the population history of the Hexi Corridor over the last 2000 years based on historical literature as a quantitative index of human activity intensity. By comparison of the timing of onset of desertification around the SHC with robust paleoclimate and historical population reconstructions, we conclude that (1) the desertification of 1590–1790 CE was likely the result of considerably enhanced human activities between the late Ming and the early Qing Dynasties, as this period was dominated by a relatively moist climate and could restrain the sand deflation; and (2) the desertification in turn caused abandonment of SHC as the impact of environmental changes on people. AU - Yang, Linhai AU - Long, Hao AU - Cheng, Hongyi AU - Hu, Guangyin AU - Duan, Hanchen AU - Zhao, Hui DA - 2020/05/01/ DO - 10.1016/j.palaeo.2020.109634 KW - Luminescence dating Demography Historical period Climate change Northern China Anthropocene PY - 2020 RN - archaeology SN - 0031-0182 SP - 109634 JO - Palaeogeography, Palaeoclimatology, Palaeoecology TI - Historical settlement abandonment in the middle Hexi Corridor linked to human-induced desertification UR - http://www.sciencedirect.com/science/article/pii/S003101822030078X VL - 545 ID - 58 ER - TY - JOUR AB - The objective of this work was to characterize more in depth the newly discovered thermally transferred optically stimulated luminescence (TT-OSL) of BeO. The studies include a more detailed investigation of the pre-heating temperature and time required to induce the TT-OSL signal; the reproducibility, additivity, and stability of the TT-OSL signal at room temperature and under ambient light exposure; the TT-OSL response to high doses (up to 25 Gy); and the possible recuperation of the OSL signal at room temperature. The results indicate that the TT-OSL is maximum for a pre-heating to 260 °C, if a heating rate of 5 °C/s is used. The TT-OSL decreases with readouts (pre-heating plus OSL readout), indicating depletion of the source of trapped charges. Sensitivity changes are observed in both OSL and TT-OSL signals to the same extend. Furthermore, it was demonstrated that the TT-OSL is additive: the TT-OSL is proportional to the total dose delivered to the detector, whereas the OSL signal is proportional to the dose since the last bleaching. This relationship holds up to ∼5 Gy; above this dose, the TT-OSL starts to saturate. The kinetics of the TT-OSL signal with pre-heating temperature and duration is consistent with a simplified model in which charges from an optically insensitive (or “difficult to bleach”) trap are transferred to an optically sensitive trap, both having similar thermal stabilities with a difference in activation energy of the order of 0.1 eV. The TT-OSL signal is stable in the dark up to the maximum duration investigated here (50 days), decaying slowly under exposure to ambient light. Furthermore, we report evidence of recuperation of the OSL signal at room temperature, which may be caused by a similar process as the one responsible for the TT-OSL signal. The results have obvious implications for practical dosimetry using BeO, including the possibility of re-estimating the doses if the detectors are accidently exposed to light, the possibility to check if the detectors have been exposed to light, the potential recuperation of OSL signal at room temperature and its influence on dosimetry if the detectors have been exposed to high doses, or the potential to use the shape of the OSL curve or the ratio between the OSL and TT-OSL signals for linear energy transfer estimation in ion beam dosimetry. AU - Yukihara, E. G. DA - 2019/07/01/ DO - 10.1016/j.radmeas.2019.106132 KW - Optically stimulated luminescence BeO Luminescence dosimetry Recuperation Thermoluminescence PY - 2019 RN - basic research dosimetry SN - 1350-4487 SP - 106132 JO - Radiation Measurements TI - Characterization of the thermally transferred optically stimulated luminescence (TT-OSL) of BeO UR - http://www.sciencedirect.com/science/article/pii/S1350448719302501 VL - 126 ID - 48 ER - TY - JOUR AB - The transition zone between Eastern Alps and Pannonian Basin is a key area for the investigation of the interplay between regional uplift, local tectonic subsidence and depositional environment. Our study area, the western margin of the Little Hungarian Plain, is characterized by gentle hills, plateaus and depressions, of which several are filled by lakes—including one of Austria’s largest and shallowest lakes, Lake Neusiedl. Geological investigation is hampered by the scarcity of outcrops, and thus direct observation of sedimentological or structural features is difficult. Despite a long research history in the area, a consistent landscape evolution model considering all relevant constraints is lacking so far. In this study, we apply multidisciplinary methods to decipher the complex tectonic and fluvial depositional evolution of the region. Local data from shallow-lake drilling and seismic investigation are combined with regional data from industrial seismics and core data to gain new insights into the latest Pannonian (Late Miocene) and Quaternary evolution. Shallow-lake seismic data show the erosionally truncated Pannonian sediments dipping and thickening toward southeast, toward the modern depocenter of the Little Hungarian Plain. Overlying Quaternary fluvial sediments show a very similar thickening trend except for the area on the plateau north of the lake indicating ongoing subsidence in major parts of the basin. Drill cores from locations along the lake seismic lines were analyzed concerning their age, mineralogy and heavy minerals and compared with outcrop samples from the surrounding plains and the plateau to derive indications on sediment provenance. A key observation is the apparent lack of a significant gravel layer on top of the tilted Pannonian sediments beneath Lake Neusiedl. Small-scale faults can be observed in the lake seismic sections along with key sedimentary features. Significant differences of the current elevation of the top Pannonian between the surrounding plains and the plateau indicate post-Pannonian normal faulting, which is a key process in shaping the present-day morphology of the region. Luminescence ages of samples from the Quaternary fluvial gravels on top of the Pannonian sediments are a significantly higher (>300 ka) compared to the gravels in the plain (102 ± 11 and 76 ± 8 ka), suggesting ongoing tectonic subsidence. AU - Zámolyi, A. AU - Salcher, B. AU - Draganits, E. AU - Exner, U. AU - Wagreich, M. AU - Gier, S. AU - Fiebig, M. AU - Lomax, J. AU - Surányi, G. AU - Diel, M. AU - Zámolyi, F. DA - 2017/07/01 DO - 10.1007/s00531-016-1383-3 IS - 5 PY - 2017 RN - tephra (and volcanic related) SN - 1437-3262 SP - 1695-1721 JO - International Journal of Earth Sciences TI - Latest Pannonian and Quaternary evolution at the transition between Eastern Alps and Pannonian Basin: new insights from geophysical, sedimentological and geochronological data UR - https://doi.org/10.1007/s00531-016-1383-3 VL - 106 ID - 90 ER - TY - JOUR AB - Compared to quartz, the infrared stimulated luminescence (IRSL) of K-feldspar saturates at higher dose, which has great potential for extending the dating limit. However, dating applications with K-feldspar has been hampered due to anomalous fading of the IRSL signal. The post-IR IRSL (pIRIR) signal of K-feldspar stimulated at a higher temperature after a prior low-temperature IR stimulation has significantly lower fading rate. Different dating protocols have been proposed with the pIRIR signals and successful dating applications have been made. In this study, we review the development of various pIRIR dating protocols, and compare their performance in estimating the equivalent dose (De). Standard growth curves (SGCs) of the pIRIR signals of K-feldspar are introduced. Single-grain K-feldspar pIRIR dating is presented and the existing problems are discussed. AU - Zhang, Junjie AU - Li, Sheng-Hua DO - 10.3390/mps3010007 KW - OSL dating K-feldspar post-IR IRSL standard growth curve (SGC) single-grain IS - 1 PY - 2020 RN - review SN - 2409-9279 SP - 7 JO - Methods and Protocols TI - Review of the Post-IR IRSL dating protocols of K-feldspar VL - 3 ID - 130 ER - TY - JOUR AB - Alpha irradiation is less efficient in inducing the thermoluminescence (TL) signal compared to beta and gamma irradiation. Although TL dating has been applied to calcite from various geological contexts, studies of the alpha effectiveness (a-values) of calcite are relatively scarce, and the reported a-values are focused on the 280 °C TL peak of speleothem calcite. In this study, three single-aliquot regenerative-dose (SAR) protocols were applied to measure the a-values of the 280 °C TL peak, the 350 °C TL peak, and the isothermal thermoluminescence at 240 °C (ITL240) of calcite from travertine, limestone and marble samples. The performances of the three SAR protocols were compared and the ITL240 signal was generally equivalent to the 280 °C TL peak TL. The a-values of the 280 °C TL peak of the samples range from 0.19 to 0.24, with a mean value of 0.20 ± 0.01, which are within the range of a-values previously reported for speleothems. The a-values of the ITL240 signal are slightly higher, and the mean value is 0.23 ± 0.01. However, the 350 °C TL peak has a lower mean a-value of 0.15 ± 0.01. The dose response curves for the 280 °C TL peak, 350 °C TL peak and ITL240 signal of the samples have characteristic saturation doses (D0) of 3000–5000 Gy, showing great potential for dating samples millions of years old. AU - Zhang, Junjie AU - Wang, Leibin DA - 2020/07/01/ DO - 10.1016/j.jlumin.2020.117205 KW - Alpha effectiveness a-value Thermoluminescence dating Calcite PY - 2020 RN - basic research calcite SN - 0022-2313 SP - 117205 JO - Journal of Luminescence TI - Thermoluminescence dating of calcite – Alpha effectiveness and measurement protocols UR - http://www.sciencedirect.com/science/article/pii/S0022231319317144 VL - 223 ID - 52 ER - TY - JOUR AB - Many studies have been carried out to understand the nature of the loess formation and its palaeoenvironmental significance in different parts of Eurasia, especially Europe and China. However, in spite of its key position, our knowledge about the loess deposits at the core of the Eurasian loess belt in central Asia is still limited, particularly in terms of absolute dating. This study presents a new luminescence chronology of a loess-palaeosol sequence (Rudak section) in the vicinity of the Gissar Range, Uzbekistan, using both quartz optically stimulated luminescence dating and polymineral post-IR IRSL dating techniques. The dating results suggested a loess accumulation history over the past 180 kyr at Rudak section, characterized by a great depositional hiatus during the entire last glacial period, likely owing to too harsh climate conditions for favouring dust accretion and loess preservation in the piedmont areas of central Asia. Hence, contrasting with the traditional concept of continuous (quasi-continuous) deposition of loess, the direct stratigraphical correlation might be problematic for climatic interpretation of loess-palaeosol sequence in this area. Furthermore, magnetic susceptibility of Rudak section demonstrated the moisture peaks in phase with ice-volume minima over the glacial and interglacial cycles, indicating moisture variation in the Westerlies-dominated central Asia was broadly consistent with that in monsoonal Asia on orbital timescales, but nearly contrasting picture with each other on the suborbital timescales, at least through the Holocene epoch. The Westerlies-dominated central Asia has generally experienced a dry first half and a wet second half of the Holocene, which has likely been driven by solar insolation gradients between mid-latitudes and high-latitudes as well as the melt-water flux. AU - Zhang, Jingran AU - Zhou, Xinying AU - Long, Hao DA - 2020/06/01/ DO - 10.1016/j.palaeo.2020.109695 KW - Dust accumulation Luminescence dating Sedimentary hiatus Moisture variations Westerlies PY - 2020 RN - loess SN - 0031-0182 SP - 109695 JO - Palaeogeography, Palaeoclimatology, Palaeoecology TI - Late Quaternary loess accumulation at the Rudak section in Uzbekistan, central Asia: Chronology and palaeoclimate implications UR - http://www.sciencedirect.com/science/article/pii/S0031018220301401 VL - 547 ID - 114 ER - TY - JOUR AB - Dating fluvial terraces has long been a challenge for geologists and geomorphologists, because terrace straths and treads are not usually directly dated. In this study, the formation ages of the Yellow River terraces in the Baode area in China were determined by dating fluvial deposits overlying bedrock straths using optically stimulated luminescence (OSL) dating techniques. Seven terraces (from the lowest terrace T1 to the highest terrace T7) in the study area were recognized, and they are characterized by thick fluvial terrace deposits overlaid by loess sediments. Twenty-five samples from nine terrace sections were dated to about 2–200 ka. The OSL ages (120–190 ka) of the fluvial samples from higher terraces (T3–T6) seem to be reliable based on their luminescence properties and stratigraphic consistency, but the geomorphologic and stratigraphic evidence show that these ages should be underestimated, because they are generally similar to those of the samples from the lower terrace (T2). The formation ages of the terrace straths and treads for the T1 terrace were deduced to be about 44 ka and 36 ka, respectively, based on the deposition rates of the fluvial terrace deposits, and the T2 terrace has the same strath and tread formation age of about 135 ka. The incision rate was calculated to be about 0.35 mm/ka for the past 135 ka, and the uplift rate pattern suggests that the Ordos Plateau behaves as a rigid block. Based on our previous investigations on the Yellow River terraces and the results in this study, we consider that the formation ages of terrace straths and treads calculated using deposition rates of terrace fluvial sediments can overcome problems associated with age underestimation or overestimation of strath or fill terraces based on the single age of one fluvial terrace sample. The implication is that, for accurate dating of terrace formation, terrace sections should be systematically sampled and dated. AU - Zhang, Jia-Fu AU - Qiu, Wei-Li AU - Hu, Gang AU - Zhou, Li-Ping DO - 10.3390/mps3010017 KW - terrace strath and tread ages luminescence dating deposition rate age-depth model Yellow River terrace IS - 1 PY - 2020 RN - fluvial loess SN - 2409-9279 SP - 17 JO - Methods and Protocols TI - Determining the age of terrace formation using luminescence dating—a case of the Yellow River terraces in the Baode area, China VL - 3 ID - 39 ER - TY - JOUR AB - Understanding long-term, large cyclone activity is critical for coastal management and disaster prevention and mitigation, particularly with projected rising sea level and increasing cyclone frequency and the intensity. Here we present sedimentary evidence (cyclone overwash deposits, beachrock boulders, and cyclone-induced clastic deposits) of historic large cyclone events from coastal dune deposits on eastern Hainan Island, China. Based on luminescence dating and sedimentological analysis, eight historic tropical cyclone events (at 1095 ± 90 BCE, 900–1000 BCE, 975 ± 50 CE, 1720 ± 20 CE, 1740 ± 35 CE, 1790 ± 25 CE, 1850 ± 15 CE, and 1895 ± 10 CE) have been identified in this region. The elevation of the termination point of cyclone overwash deposit layers that represent the paleo-cyclone minimum wave run-up stage, in combination with knowledge of present-day cyclone events, was applied to assess the intensity of these extreme events. The intensity of these cyclone events was likely greater than that of cyclones in the local instrumental records. Furthermore, these large cyclone events correspond to historic records of devastating cyclones. Through comparison with regional and global climate records, we infer that the variability of large cyclones in the South China Sea was probably modulated by the El Niño-Southern Oscillation, western Pacific warm pool, and local sea surface temperatures over the past 3400 yr. These results provide an improved understanding of long-term, extreme cyclone events and their response to climate change, thereby contributing to regional planning and coastal defense strategies. AU - Zhou, Liang AU - Gao, Shu AU - Jia, Jianjun AU - Zhang, Yuzhu AU - Yang, Yang AU - Mao, Longjiang AU - Fang, Xin AU - Shulmeister, James DA - 2019/10/01/ DO - 10.1016/j.sedgeo.2019.105524 KW - Coastal dune Large cyclone Luminescence dating Hainan Island El Niño–Southern Oscillation PY - 2019 RN - coastal SN - 0037-0738 SP - 105524 JO - Sedimentary Geology TI - Extracting historic cyclone data from coastal dune deposits in eastern Hainan Island, China UR - http://www.sciencedirect.com/science/article/pii/S0037073819301733 VL - 392 ID - 165 ER - TY - JOUR AB - The thermoluminescence (TL) trapping parameters of annealed quartz have been investigated. The apparent TL peaks observed at temperatures of 133°C, 211°C, 266°C and 405°C, respectively, were named Peak I, Peak II, Peak III and Peak IV. The Tm − Tstop method is applied to investigate the number of peaks and their positions, and to obtain the trap distributions in the quartz. Peak shape (PS), Hoogenstraaten method (Various Heating Rates Method, VHR), and Computerized Glow Curve Deconvolution (CGCD) are used to evaluate the trapping parameters of the annealed quartz. The glow curve can be considered as a superposition of at least nine overlapping peaks. These peaks show up at 133°C, 211°C, 266°C, 308°C, 333°C, 384°C, 441°C, 466°C and 484°C. The PS method can be only used in evaluating the parameters for Peaks I. The VHR method can be used in evaluating the trapping parameters for the first three peaks. CGCD method is complementary to obtaining parameters for the sub-peaks, and the thermal quenching correction with the Urbach’s method is necessary. The Urbach’s coefficient for the quartz is 30.03kTm. AU - Zhou, Rui AU - Wei, Ming-Jian AU - Song, Bo AU - Zhang, Yan AU - Zhao, Qiu-Yue AU - Pan, Bao-Lin AU - Li, Teng-Fei DA - 2016/05/15/ DO - 10.1016/j.nimb.2016.02.067 KW - Natural quartz Thermoluminescence Trap Parameter PY - 2016 RN - basic research SN - 0168-583X SP - 32-39 JO - Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms TI - Evaluation of trapping parameters of annealed natural quartz UR - http://www.sciencedirect.com/science/article/pii/S0168583X16002068 VL - 375 ID - 6 ER - TY - JOUR AB - In tropical Southern Hemisphere South America, late Quaternary marine core and speleothem records provide different proxies and accurate chronologies correlating millennial-scale intervals of increased precipitation with southward shifts of the Intertropical Convergence Zone (ITCZ). However, the climatic effect of these intervals on coastal landforms is poorly understood. Here we investigated the response of abrupt and long-lasting climate events during the Marine Isotope Stages 3 and 2 in a 13.8-m thick sand succession located in a large-scale coastal eolian system, the Lençóis Maranhenses Dunefield, NE Brazil, where winds and precipitation are anti-phased and controlled by the single action of the ITCZ. A chronology of the sediment overburden determined by optically stimulated luminescence (OSL) dating of 14 sediment samples obtained at 1-m intervals showed ages between 132.2 ± 7.0 and 12.9 ± 0.6 thousand years ago in stratigraphic order. A multi-proxy approach based on grain size, surface grain texture, heavy minerals, thermoluminescence (TL) sensitivity, inorganic geochemistry, reflectance, and magnetic parameters from 268 sediment samples collected at 5-cm intervals indicated periods of dune building and stabilization. Significant stabilization periods are synchronous with Heinrich Stadials 6, 4, 3, 2, and 1, and Greenland Stadial 4, within age model uncertainties. Heavy mineral analysis indicated a steady sand source to the dune succession, while TL sensitivity analysis of quartz grains showed the input allochthonous sediments during stadials. The preservation of peak dune activity during the Last Glacial Maximum is attributed to the enduring precipitation brought by the subsequent Heinrich Stadial 1 event. AU - Zular, André AU - Sawakuchi, André O. AU - Wang, Hong AU - Guedes, Carlos C. F. AU - Hartmann, Gelvam A. AU - Jaqueto, Plínio F. AU - Chiessi, Cristiano M. AU - Cruz, Francisco W. AU - Giannini, Paulo C. F. AU - Daros, Vinícius K. AU - Atencio, Daniel AU - Trindade, Ricardo I. F. DA - 2020/01/30/ DO - 10.1016/j.quaint.2019.12.012 KW - Lençóis maranhenses dunefield Heinrich stadials Last glacial maximum Paleoclimate Coastal eolian deposits Optically stimulated luminescence Multy-proxy approach PY - 2020 RN - aeolian SN - 1040-6182 SP - 97-111 JO - Quaternary International TI - The response of a dune succession from Lençóis Maranhenses, NE Brazil, to climate changes between MIS 3 and MIS 2 UR - http://www.sciencedirect.com/science/article/pii/S104061821930936X VL - 537 ID - 37 ER -