Variations in luminescence properties of quartz and feldspar from modern fluvial sediments in three rivers |
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| Institution: | 1. Institute for Geology, University of Innsbruck, 6020, Austria;2. ARC Centre of Excellence for Australian Biodiversity and Heritage, GeoQuest Research Centre, University of Wollongong, 2500, Australia;1. State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China;2. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;3. Nordic Laboratory for Luminescence Dating, Department of Geoscience, University of Aarhus, DTU Risø Campus, DK-4000 Roskilde, Denmark;4. Centre for Nuclear Technologies, Technical University of Denmark, DTU Risø Campus, DK-4000 Roskilde, Denmark;5. Key Laboratory of Western China''s Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China;1. Department of Earth and Environmental Sciences, Tulane University, New Orleans, LA, USA;2. Netherlands Centre for Luminescence Dating & Soil Geography and Landscape Group, Wageningen University, Wageningen, The Netherlands;3. Department of Earth and Environmental Sciences, Vanderbilt University, Nashville, TN, USA;4. Lamont-Doherty Earth Observatory of Columbia University, Palisades, USA;5. Department of Marine Science, Coastal Carolina University, Conway, SC, USA;1. Department of Earth Sciences, University of California Santa Barbara, USA;2. Department of Physics, East Carolina University, USA;3. Department of Geological and Environmental Sciences, California State University Chico, USA;1. Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Science, P.O. Box 9825, Beijing 100029, China;2. CAS Center for Excellence in Tibetan Plateau Earth Sciences, China;3. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;1. Leibniz Institute for Applied Geophysics, Stilleweg 2, Hannover 30655, Germany;2. Kogakkan University, 1704 Kodakushimoto-cho, Ise, 516-8555 Japan;3. Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, D-04103 Leipzig, Germany;4. Center for Nuclear Technologies, Technical University of Denmark, DTU Risø Campus, DK-4000, Roskilde, Denmark;1. UMR 5060 CNRS - Université Bordeaux Montaigne, IRAMAT-CRP2A, Maison de l''archéologie, Esplanade des Antilles, 33607 Pessac cedex, France;2. Jean Leray Laboratory of Mathematics (LMJL), UMR6629 CNRS - Université de Nantes, France;3. Nordic Laboratory for Luminescence Dating, Department of Geoscience, Aarhus University, DTU Risø Campus, DK-4000 Roskilde, Denmark;4. Center for Nuclear Technologies, Technical University of Denmark, DTU Risø Campus, DK-4000 Roskilde, Denmark |
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| Abstract: | Studies of modern sediments, their sedimentology and depositional processes are important for understanding the behaviour of the luminescence characteristics of quartz and feldspar in fluvial settings. Previous studies have shown large variations in OSL characteristics of quartz from different fluvial systems, while the IRSL and pIRIR signals from K-feldspar have been understudied. We test the effects of fluvial setting on luminescence characteristics by collecting modern (<1 year old) bedload sediments down the courses of three river systems with very different hydrological characteristics, geologic contexts, and catchment lithologies. The single grain (SG) and multi-grain aliquot (MGA) OSL (quartz) and IRSL and pIRIR (K-feldspar) properties of samples were measured and compared to better understand intra- and inter-fluvial system patterns in sensitivity, bleaching, and equivalent dose (De) distribution skewness and kurtosis. The quartz OSL and K-feldspar IRSL and pIRIR signal sensitivities increase with downstream transport distance of sediments, confirming previous studies (quartz) and showing that IRSL signals from K-feldspar also increase in response to reworking cycles. Increasing transport distance also results in better bleaching of the OSL signal from quartz samples (MGA and SG) due to more grains being exposed to sunlight. By contrast, the IRSL and pIRIR signals retain significant residuals in all samples, though 5–15% of grains yield zero-dose De values and age modelling of SG data yields accurate burial dose estimates. Additionally, the skewness and kurtosis of SG OSL De datasets from one river increase with transport distance, with the best bleached samples exhibiting the highest skewness, thereby questioning the applicability of the skewness-value of a De dataset as an accurate indicator for partial-bleaching. Our data shows marked variability between (i) different river systems and (ii) the measured minerals, however consistent use of statistical models allows accurate De estimation in all contexts. Age modelling of SG data from K-feldspar, thus, provides a valuable tool for future fluvial research in regions where poor OSL characteristics prevent the use of quartz as a dosimeter. |
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| Keywords: | Single-grain Feldspar OSL Post IR-IRSL Fluvial |
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