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Grain Size Analysis and 36Cl Dating of Early Pleistocene Sediments of Dunhuang Basin,Tectonic Uplift Implication

REN Shou-mai1,MENG Jing-yao2, LIN Yuan-xian3, JIANG Wen-li1, QIAO De-wu1, HE Ming4, ZUO Tian-wen5   

  1. 1.Strategic Research Center of Oil &|Gas Resources, Ministry of Land &|Resources, Beijing100034, China;
    2.College of Earth Sciences, Jilin University, Changchun130061, China;
    3.Tianjin Institute of Geology and Mineral Resources, Tianjin300170, China;
    4.Department of Nuclear Physics, China Institute of Atomic Energy, Beijing102413, China;
    5.Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing100029, China
  • Received:2011-03-15 Online:2011-09-26 Published:2011-09-26

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Abstract:

The Early Pleistocene rapid uplift of the Tibet plateau plays an important role to global climate change, formation of basin-range geography and appearance of desertification in Western China. Detailed grain size analysis and 36Cl dating have been carried out on the Early Pleistocene fluvio-lacustrine sediments of the Dunhuang basin in northeastern Tibet plateau. Results show that the Dangjinshan Mountains rose rapidly at the end of the Early Pleistocene (1.164-1.087 Ma B. P.), and gravels and coarse sandstones were deposited with high sedimentation rate. From 1.087 Ma B. P. to 0.809 Ma B. P., mountain uplift speed became slower with lower sedimentation rate. Since 0.809 Ma B. P., climate in the Dunhuang basin area became arid, and desert was formed possibly affected by mountain uplift. The regional analysis results suggest that the last uplifting time of Mountains in the Middle-West China was distinction, which generated various climate effects. Therefore, the relationship between tectonic uplift of the Tibet plateau and climate change is needed to further study.

Key words: Dunhuang basin, Early Pleistocene, grain size analysis, Cl dating, uplift, tectonics

CLC Number: 

  • P597.3
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