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Sedimentary characteristics of paleo-aeolian dune sands of Salawusu Formation in the Salawusu River Valley
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  • 作者:Xianjiao Ou (1) (3)
    Baosheng Li (1) (2)
    Heling Jin (4)
    Guangrong Dong (4)
    David Dian Zhang (5)
    Zheng Wu (1)
    Xiaohao Wen (1)
    Lanhua Zeng (3)
    Chuntao Ouyang (1)
    Yi Yang (1)
    Yufei Liu (1)
  • 关键词:Salawusu River Valley ; Salawusu Formation ; paleo ; aeolian dune sands ; aeolian sedimentary characteristics
  • 刊名:Journal of Geographical Sciences
  • 出版年:2008
  • 出版时间:May 2008
  • 年:2008
  • 卷:18
  • 期:2
  • 页码:211-224
  • 全文大小:556KB
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  • 作者单位:Xianjiao Ou (1) (3)
    Baosheng Li (1) (2)
    Heling Jin (4)
    Guangrong Dong (4)
    David Dian Zhang (5)
    Zheng Wu (1)
    Xiaohao Wen (1)
    Lanhua Zeng (3)
    Chuntao Ouyang (1)
    Yi Yang (1)
    Yufei Liu (1)

    1. School of Geography, South China Normal University, Guangzhou, 510631, China
    3. Department of Geography, Jiaying University, Meizhou, 514015, China
    2. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, CAS, Xi’an, 710061, China
    4. Cold and Arid Regions Environmental and Engineering Research Institute, CAS, Lanzhou, 730000, China
    5. Department of Geography and Geology, the University of Hong Kong, Hong Kong, China
  • ISSN:1861-9568
文摘
The Salawusu Formation of Milanggouwan section in Salawusu River Valley includes 7 layers of paleo-mobile dune sands, and 4 layers of paleo-fixed and semi-fixed dune sands. Their structures have been observed and their grain size, surface textural features and several main chemical elements have been analyzed. The results showed that: 1) Some of the aeolian structural characteristics of these dune sands are similar to that of the recent dune sands. 2) They are also similar to the recent dune sands in grain size components, and parameters of Mz, σ, Sk and Kg, as well as in several main chemical components. 3) The scattergrams of Mz-σ and SiO2-Al2O3+TOFE and the probability curves of grain size showed that these paleo-dune sands are different from paleosols and fluvio-lacustrine facies, but are consistency with recent dune sands. 4) Quartz sands have well roundness and surface textural features such as dish-shaped pits, crescent-shaped pits, pockmarked pits, upturned cleavage plates, siliceous precipitates and siliceous crevasses, indicating that they had been carried for a long time by the wind. As the 11 layers of paleo-dune sands possess the aeolian characteristics in structure, grain size, surface textural features and chemical elements, the origin of their formation should be attributed to eolation.

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