Investigating the components of the optically stimulated luminescence signals of quartz grains from sand dunes in China |
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| Institution: | 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. Division of Tethys Research Center, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, People''s Republic of China;2. University of the Chinese Academy of Sciences, Beijing 100049, People''s Republic of China;3. Research School of Earth Sciences, The Australian National University, Canberra, ACT 0200, Australia;1. Chair of Geomorphology, University of Bayreuth, 95440 Bayreuth, Germany;2. IRAMAT-CRP2A, Université Bordeaux Montaigne, 36607 Pessac Cedex, France;3. Department of Physics, East Carolina University, Greenville, NC 27858, USA;4. Department of Geography, Justus-Liebig-University Giessen, 35390 Giessen, Germany;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 Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, China;2. Centre for Archaeological Science, School of Earth and Environmental Sciences, University of Wollongong, Wollongong, NSW 2522, Australia;1. Centre for Archaeological Science, School of Earth and Environmental Sciences, University of Wollongong, Wollongong, NSW 2522, Australia;2. Department of Earth Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, China |
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| Abstract: | The optically stimulated luminescence (OSL) signals from quartz consist of several physically distinct components, which are commonly referred to as fast, medium and slow components. In this study, the OSL components of quartz from the Taklimakan Desert and the Hunshandake sandy land in north China are investigated. Our results show that the relative contributions of OSL components to the bulk OSL signal can be significantly different among quartz grains from both deserts. Laboratory dosing, optical bleaching and heating experiments are used to test their effects on the relative contributions of quartz OSL components. It is found that cycles of dosing and optical bleaching have insignificant impact on the relative contributions of quartz OSL components, while heating to high temperature (500 °C) can significantly enhance the contribution of the fast component to the bulk OSL signals, especially for quartz samples from the Taklimakan Desert. Such results suggest that the different heating history of natural quartz grains plays an important role in controlling OSL components. Additionally, the quartz grains from the Hunshandake sandy land can easily be distinguished from those of the Taklimakan Desert, by using a ternary plot of fast-medium-slow components. The quartz grains from the Hunshandake sandy land exhibit a much stronger fast component than those from the Taklimakan Desert. This can be explained by that the quartz grains from the Hunshandake sandy land are mainly of igneous origin, while most of the quartz grains from the Taklimakan Desert are of low grade metamorphic origin. |
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| Keywords: | Quartz OSL Component Northern desert Provenance |
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