Optical dating of sediments in Wadi Sabra (SW Jordan) |
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| Institution: | 1. University of Cologne, Institute for Geography, Albertus-Magnus-Platz, D-50923 Cologne, Germany;2. RWTH Aachen University, Department of Geography, Templergraben 55, D-52056 Aachen, Germany;3. University of Cologne, Institute of Prehistoric Archaeology, Albertus-Magnus-Platz, D-50923 Cologne, Germany;4. University Duisburg-Essen, Rectorate, Universitätsstraße 1, D-45117 Essen, Germany;1. Nagoya University Museum, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8601, Japan;2. The University Museum, The University of Tokyo, Hongo 7-3-1, Bunkyo, Tokyo, 113-0033, Japan;1. Research Laboratory for Archaeology and the History of Art, University of Oxford, Dyson Perrins Building, South Parks Road, Oxford OX1 3QY, UK;2. IRAMAT-CRP2A, UMR 5060 CNRS – Université Bordeaux Montaigne – Maison de l''archéologie, Esplanade des Antilles, 33600 Pessac, France;3. Illinois State Geological Survey, Prairie Research Institute, University of Illinois at Urbana-Champaign, USA;4. Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany;5. French National Institute for Preventive Archaeological Research, INRAP, 141 rue d’Alésia, Paris, France;6. School of Geography Archaeology and Environmental Studies, University of the Witwatersrand, Private Bag 3, Wits 2050, Johannesburg, South Africa;7. Département de Préhistoire, Muséum National d''Histoire Naturelle, UMR 7194 CNRS, 24620 Les Eyzies-de-Tayac, France;8. Department of Anthropology, University of Pennsylvania, Philadelphia, USA;9. Institute for Human Origins, Arizona State University, USA;10. Institute for Archaeological Sciences, University of Tübingen, Rümelinstr. 23, 72070 Tübingen, Germany;11. School of Earth and Environmental Sciences, University of Wollongong, Northfields Avenue, Wollongong, NSW 2522, Australia;12. Musée National de Préhistoire, F-24620 Les Eyzies-de-Tayac, France;13. CNRS, Université de Bordeaux, MCC, PACEA, UMR 5199, F-33400 Talence, France;14. Human Evolution Studies Program and Department of Archaeology, Simon Fraser University, Burnaby, Canada;15. University of California, Davis, USA;1. University of Greifswald, Institute of Geography and Geology, F.-L. Jahn Str. 17a, 17487 Greifswald, Germany;2. Leibniz Institute for Applied Geophysics (LIAG), Geochronology and Isotope Hydrology, Stilleweg 2, 30655 Hannover, Germany;1. Academician Koptyug Ave., 3, 630090, Novosibirsk, Russia;2. A. Donish Institute of History, Archaeology and Ethnography, National Academy of Sciences of Tajikistan, ak. Rudaki ave., 33;3. Staromonetny per., 29/4, 119017, Moscow, Russia;4. Department of Physics, Technical University of Denmark, DTU Risø Campus, Roskilde, Denmark;5. Nordic Laboratory for Luminescence Dating, DTU Physics and Department of Geoscience, Aarhus University, DTU Risø Campus, Roskilde, Denmark;6. Department of Earth Sciences, Uppsala University, Uppsala, Sweden;7. Leninskiye gory, GSP-1, Moscow, Russia |
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| Abstract: | At Wadi Sabra (SW Jordan) human occupation dates back to the Palaeolithic and Epipalaeolithic. Although there is stratigraphic correlation based on archaeological finds of Ahmarian origin, numerical age estimates are lacking. We applied single-aliquot optical dating of coarse grained quartz of wadi deposits and investigated the luminescence properties in detail to achieve more accurate age information about the time of human occupation. Weak luminescence signals and scattered dose distributions characterise the multi-grain aliquots. The residual doses of the investigated modern wadi sediment are between 0 and 7 Gy. Moreover, comparison of equivalent dose (De) values of 1 mm and 8 mm aliquots shows higher equivalent doses for the large aliquots. Both experiments indicate that the luminescence signal is partially bleached prior to deposition. The dose distributions of all samples are broadly scattered and have overdispersion values between 25 and 43%, some samples are significantly skewed. The shape of the dose distributions points to other sources of scatter, in addition to partial bleaching. Comparison of 1 mm multi-grain and single-grain data demonstrates that the luminescence signal of one multi-grain aliquot most likely is from a single grain. For this reason, variation in the number of photon counts due to the weak luminescence intensity and variations in beta microdosimetry have a bigger impact on the spread of dose distributions. However, we cannot quantify the particular impact of partial bleaching, weak luminescence intensity and beta microdosimetry. To account for the spread of the dose distribution, we use the central age model to calculate equivalent doses. Age calculations yield results in the range of 30–48 ka. |
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| Keywords: | Optical dating Ephemeral deposits SW Jordan Quartz Dose distributions |
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