Vertical variations of luminescence sensitivity of quartz grains from loess/paleosol of Luochuan section in the central Chinese Loess Plateau since the last interglacial |
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| Institution: | 1. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;2. Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Science, P. O. Box 9825, Beijing 100029, China;3. Department of Earth Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, China;4. Earth Quake Administration of Fujian Province, Xiamen 361021, China;1. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710075, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Institute of Global Environmental Change, Xi’an Jiaotong University, Xi’an 710049, China;4. The Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang 050803, China;1. Department of Earth Sciences, ETH, 8092 Zurich, Switzerland;2. Center for Nuclear Technologies, Technical University of Denmark, DTU – Risø Campus, Roskilde, Denmark;3. Netherlands Centre for Luminescence Dating, Soil Geography and Landscape Group, Wageningen University, Wageningen, The Netherlands;4. Faculty of Applied Sciences, Delft University of Technology, Mekelweg 15, 2629JB Delft, The Netherlands;5. Nordic Laboratory for Luminescence Dating, Department of Geoscience, Aarhus University, DTU Risø Campus, Denmark;6. Geological Survey of Norway, POB 6315 Sluppen, 7491 Trondheim, Norway;7. Natural History Museum of London, Cromwell Road, London SW7 5BD, UK;8. Institute of Geological Sciences, University of Bern, Baltzerstrasse 1+3, 3012 Bern, Switzerland;9. Department of Physical Geography and Quaternary Geology, Stockholm University, 10691 Stockholm, Sweden;10. Department of Earth, Planetary, and Space Sciences, UCLA, Los Angeles, CA 90095-1567, USA;11. Department of Geosciences, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan;12. Department of Earth Sciences, Indian Institute of Technology, Bombay, Powai 400 076, India;13. Institute of Earth Surface Dynamics, University of Lausanne, Geopolis 3232, 1015 Lausanne, Switzerland;1. School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210023, China;2. Nordic Laboratory for Luminescence Dating, Department of Geoscience, Aarhus University, Risø Campus, DK-4000 Roskilde, Denmark;3. Center for Nuclear Technologies, Technical University of Denmark, Risø Campus, DK-4000 Roskilde, Denmark;4. Leibniz Institute for Applied Geophysics, S3: Geochronology and Isotope Hydrology, Hannover, Germany;1. U.S. Geological Survey, Box 25046, MS 974, Denver Federal Center, Denver, CO 80225, USA;2. Cooperative Institute for Environmental Research, University of Colorado – Boulder, CO 80302, USA;1. Department of Geosciences and Geography, P.O. Box 64, 00014 University of Helsinki, Finland;2. Faculty of Earth and Life Sciences, VU University Amsterdam, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands;3. Geological Survey of Finland (GTK), P.O. Box 96, Betonimiehenkuja 4, 02150 Espoo, Finland |
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| Abstract: | The provenance of loess in Chinese Loess Plateau, including origin, transport pathways and source areas, has long been one of the most important questions. In this study, the vertical variations of the luminescence sensitivity of quartz grains from the central Chinese Loess Plateau were investigated by using optically stimulated luminescence (OSL) techniques. Our results indicate that the luminescence sensitivity of quartz grains of paleosols can be much higher than that of loess beds. In addition, the quartz grains from the loess-paleosol sequence exhibit a temporal trend in the strength of luminescence sensitivity, characterized by higher values in soils and lower values in loess beds. The OSL sensitivity of quartz grains of the loess-paleosol sequence also shows very similar trend to the magnetic susceptibility and particle size fluctuations, implying that the luminescence sensitivity might be climatic dependent. The possible factors affecting the variations of luminescence sensitivity were discussed including particle size, natural radioactivity, and the provenance of eolian deposits. We suggest that the temporal variations of luminescence sensitivity can be attributed to the retreat-advance of deserts, the different contributions of glacial origin quartz particles associated with mountain processes, and wind patterns during glacial/interglacial cycles. Therefore, the secular variations of luminescence sensitivity of quartz grains are ultimately influenced by past climatic change through its controlling on sediment provenance changes. |
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| Keywords: | Loess-paleosol sequence Luminescence sensitivity Quartz Provenance |
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