Rapid age assessment in the Namib Sand Sea using a portable luminescence reader |
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| Affiliation: | 1. School of Environment, Education and Development, University of Manchester, M13 9PL, United Kingdom;2. SoGE, University of Oxford, OX1 3QY, United Kingdom;3. Department of Geography, University of Sheffield, Winter St., Sheffield, S10 2TN, United Kingdom;1. Luminescence Dating Laboratory, Birbal Sahni Institute of Palaeobotany, Lucknow, 226007, India;2. Department of Humanities and Social Sciences, Indian Institute of Science Education and Research, Mohali, 140306, India;3. Centre for Nuclear Technologies, Risoe-DTU, 4000, Roskilde, Denmark;4. Geosciences Division, Physical Research Laboratory, Navrangpura, Ahmedabad, 380009, India;5. Department of Archaeology and Ancient History, Faculty of Arts, The Maharaja Sayajirao University of Baroda, Vadodara, 390002, India;6. Department of Geology, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara, 390002, India;7. Centre of Advanced Study in Geology, Panjab University, Chandigarh, 160014, India;8. CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad, 500007, India;1. Leibniz Institute for Applied Geophysics (LIAG), Stilleweg 2, 30655 Hannover, Germany;2. Department of Geography, RWTH Aachen University, Templergraben 55, 52056 Aachen, Germany;1. MOE Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China;2. School of Geography, Beijing Normal University, Beijing 100875, China;3. Centre for Archaeological Science, School of Earth and Environmental Sciences, University of Wollongong, Wollongong, NSW 2552, Australia;4. Department of Earth Sciences, The University of Hong Kong, Pokfulam Road, HongKong, China;1. State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China;2. Key Laboratory of Vertebrate Evolution and Human Origins of Chinese Academy of Sciences, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, China;1. Département de Préhistoire, Muséum National d''histoire Naturelle, UMR7194, 1, Rue René Panhard, 75013 Paris, France;2. Department of Geography Sciences, Nanjing Normal University, Nanjing, Jiangsu, China;3. State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China;4. Département de Préhistoire, Muséum National d''histoire Naturelle, UMR7194, Centre Européen de Recherches Préhistoriques, Avenue Grégory, 66720 Tautavel, France;1. Luminescence and Gamma Spectrometry Laboratory, Instituto de Geociências, Universidade de São Paulo, Rua do Lago 562, 05508-080 São Paulo, SP, Brazil;2. Instituto do Mar, Universidade Federal de São Paulo, Av. Alm. Saldanha da Gama 89, 11030-400 Santos, SP, Brazil |
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| Abstract: | A rapid assessment of burial age for sedimentary materials is useful to aid in-situ interpretation of sites and sequences during fieldwork. This can assist with targeted field sampling strategies for full dating back in the laboratory, for example when the study is concerned with reconstructing landscape dynamics during a specific time period. Field-based luminescence measurements are possible using a portable luminescence reader; the challenge is translating relative portable luminescence reader signal intensities of samples into an estimate of age. This study uses a portable luminescence reader for the first time in the analysis of African dunefield sediments. Samples from the Namib Sand Sea (NSS) with established luminescence ages are used to assess what in-situ information about relative sample age can be gleamed at and between sites using the portable luminescence reader, and to establish whether first-order estimates of sample age can be obtained. Two sites in the NSS, which are of modern, very late Holocene and last interglacial age were selected for this assessment and a simple calibration between portable luminescence reader signals and sample age is made. Results show that portable luminescence reader signals differ by over two orders of magnitude between late Holocene and last interglacial age samples and that useful relative-age information can be established using bulk material in the field. Predicted ages from portable luminescence reader signals using a linear regression appear to be indicative and useful. Further development of this calibration using a wider range of sample ages would confirm its applicability in the NSS, and a similar approach is applicable to other sand sea environments. |
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| Keywords: | OSL dating Portable luminescence reader Rapid age assessment Namib Sand Sea Aeolian sediments |
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