A combined luminescence and radiocarbon dating study of the Ili loess,Central Asia |
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| Institution: | 1. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, 10 Fenghui Nan Road, Xi’an 710075, China;2. State Key laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;1. Key Laboratory of Western China''s Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China;2. CAS Center for Excellence in Tibetan Plateau Earth Sciences of the Chinese Academy of Sciences, Beijing 100101, China;3. School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210023, China;4. College of Resources and Environmental Sciences, Hunan Normal University, Changsha 410081, China;1. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, No 10 Fenghui Nan Road, Xi''An, Shaanxi 710075, China;2. State Key Laboratory Breeding Base of Humid Subtropical Mountain Ecology, School of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China;3. School of Geography, South China Normal University, Guangzhou 510631, China;4. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences & Ministry of Water Conservancy, Chengdu 610041, China;1. Nordic Laboratory for Luminescence Dating, Department of Geosciences, University of Aarhus, Risø Campus, Denmark;2. Center for Nuclear Technologies, Technical University of Denmark, Risø Campus, Denmark;3. Leibniz Institute for Applied Geophysics, S3: Geochronology and Isotope Hydrology, Hannover, Germany;4. School of Geographical and Oceanographical Sciences, Nanjing University, China;5. Department of Earth Sciences, Uppsala University, Sweden;6. Geography, Earth and Environmental Sciences, University of Derby, UK;1. MOE Key Laboratory of Western China’s Environmental System, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China;2. Chinese Academy of Sciences Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100101, China |
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| Abstract: | Similar to the loess in the Chinese Loess Plateau (CLP), the loess deposits in the Ili basin of Central Asia arid area play an important role in understanding the climate and environmental changes. However, in contrast to the intensively investigated loess deposits in the CLP, the Ili loess is still insufficiently known and poorly understood. The geochronology study of the Ili loess remains controversial. In order to examine the potential of optically stimulated luminescence (OSL) dating for the Ili loess, we carry out a combined luminescence and radiocarbon dating study on a 6.9 m loess section in the south margin of the Ili basin. Polymineral fine grains were investigated by post infrared (IR) OSL using a Multiple-Aliquot Regenerative-dose (MAR) protocol. Radiocarbon dating of organic carbon were carried in a 3 Megavolt (MV) multi-element Accelerator Mass Spectrometry (AMS). The results indicate that the OSL ages are in agreement with the observed stratigraphy in the field, which is well correlated with that of the CLP, but the AMS 14C ages are much younger than the OSL and assumed stratigraphical ages. Thus, the OSL dating technique may provide an absolute chronology in this loess section. Further methodological approaches and more samples analysis will lead to the improvement of this chronology for high-resolution paleoclimatic interpretation. |
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