Optically stimulated luminescence and radiocarbon dating of sediments from Lop Nur (Lop Nor), China |
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| Affiliation: | 1. MOE Laboratory for Earth Surface Processes, Department of Geography, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China;2. Institute of Mineral Resources, Chinese Academy of Geological Sciences, 26 Baiwanzhuang Road, Beijing 100037, China;3. School of Archaeology and Museology, Peking University, Beijing 100871, China;4. School of Physics, Peking University, Beijing 100871, China;1. Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China;2. Innovation Academy for Earth Sciences, Chinese Academy of Sciences, Beijing, 100029, China;3. CAS Center for Excellence in Life and Paleoenvironment, Beijing, 100044, China;4. Key Laboratory for Humid Subtropical Eco-geographical Processes of the Ministry of Education, Fujian Normal University, Fuzhou, 350007, China;5. Institute of Geography, Fujian Normal University, Fuzhou, 350007, China;6. Institute of Global Environmental Change, Xi''an Jiaotong University, Xi''an, 710054, China;7. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi''an, 710061, China;8. Key Laboratory of Karst Dynamics, MLR, Institute of Karst Geology, CAGS, Guilin 541004, China;9. College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China;10. Department of Earth and Environmental Sciences, University of Minnesota, MN, 55455, Minneapolis, USA;1. Faculty of Science, Geology and Geochemistry, Vrije Universiteit (VU, Amsterdam), De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands;2. Formerly: Faculty of Science, Geology and Geochemistry, Vrije Universiteit (VU, Amsterdam), De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands;3. Eberhard Karls Universität Tübingen, Department of Earth Sciences, Senckenberg Center for Human Evolution and Palaeoenvironment (HEP-Tübingen), Hölderlinstraße 12, 72074 Tübingen, Germany;4. Institut für Erd- und Umweltwissenschaften, Universität Potsdam, Karl-Liebknechtstraße 24-25, 14476 Potsdam-Golm, Germany;5. Faculty of Archaeology, Leiden University, Einsteinweg 2, 2333 CC Leiden, The Netherlands;6. Geosciences, Hamilton College, Taylor Science Center 1024, 13323 Clinton, NY, USA;7. Department of Anthropology, Rutgers University, Biological Sciences Building, Douglass Campus, 131 George Street, 08901-1414 New Brunswick, NJ, USA;8. Large Lakes Observatory, University of Minnesota Duluth, 1049 University Drive, 55812 Duluth, MN, USA;9. Max Planck Institute of Chemistry, Hahn-Meitnerweg 1, 55128, Mainz, Germany;1. Institute of Polar Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China;2. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi''an 710075, China;3. 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;4. Salt Lake Institute of Qinghai, Chinese Academy of Sciences, Xining 810008, China;1. Key Laboratory of Desert and Desertification, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;2. School of Geography, South China Normal University, Guangzhou 510631, China;3. Key Laboratory of Western China’s Environmental Systems (MOE), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China;4. Environmental Change Research Unit, Ecosystems and Environment Research Programme and Helsinki Institute of Sustainability Science, Faculty of Biological and Environmental Sciences, P.O. Box 65, 00014 University of Helsinki, Finland;1. MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;2. CAS Center for Excellence in Tibetan Plateau Earth Sciences & Key Laboratory of Continental Collision and Plateau Uplift, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China;3. School of Earth Science and Resources, China University of Geosciences, Beijing 100083, China |
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| Abstract: | Lop Nur is a playa lake occupying the lowest part of the Tarim Basin, northwestern China, and is now a desolate and barren region. In the past decades, the ages of the lacustrine sediments from the lake were determined mainly by radiocarbon dating on bulk sediment. In this study, both optically stimulated luminescence (OSL) and radiocarbon methods were used to date the sediments from a pit in the central part of the lake. The OSL ages obtained for ten samples range from 0.5 to 9.4 ka, and are in stratigraphic order except for one sample. The 14C ages obtained for twenty-two bulk sediment samples range from 5.8 to 30.2 cal ka BP with erratic distribution. Based on the comparison of 14C with OSL ages and their age-depth models, we argue that the OSL ages are relatively reliable. The disequilibria in the U decay chain for some samples are deduced from the comparison of the NAA and TSAC results. We suggest that the OSL dating technique should preferably be applied to the playa sediments from Lop Nur, but the disequilibria in the U decay chain should be considered in evaluating dose rates. Additionally, radiocarbon reservoir effects in lakes in western China are reviewed. |
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