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Journal of Desert Research ›› 2023, Vol. 43 ›› Issue (4): 17-30.DOI: 10.7522/j.issn.1000-694X.2022.00156

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Physical and chemical characteristics of aeolian sands in Jiudong Sandy Land of Hexi Corridor and its environmental significance

Xueyang Guo(), Linhai Yang(), Liangqing Cheng, Guangyin Hu, Jingjing Hu   

  1. School of Geography and Tourism,Shaanxi Normal University,Xi'an 710119,China
  • Received:2022-10-25 Revised:2022-11-24 Online:2023-07-20 Published:2023-08-14
  • Contact: Linhai Yang

Abstract:

Jiudong Sandy Land is located between Zhangye Oasis and Jiuquan Oasis in the middle Hexi Corridor and its aeolian process is influential to the surrounding hμman activities. In this paper, the grain size, chemical elements and mineral characteristics of the surface aeolian sands of Jiudong Sandy Land were investigated. The results show that: (1) The average grain size of aeolian sands on the surface of Jiudong Sandy Land is between 218-308 μm and mainly consists of mediμm sand and fine sand with good sorting, nearly symmetrical skewness and kurtosis is moderate. The aeolian sands generally become finer from north to south; the aeolian sands in the hinterland of the sandy land gradually become finer from west to east, while the southern edge of the sandy land presents the opposite phenomenon. The content of saltation component is the highest, followed by short distance suspension component, creeping component and long-distance suspension component. (2) The major element is SiO2, and the content of CaO and MgO decreases along the dominant wind direction. Except for Cr, Ni and Co, trace elements show obvious enrichment while other elements are depleted to varying degrees. (3) The minerals are mainly hard minerals of quartz and feldspar, followed by dolomite, and the content of other minerals is very low. The mineral maturity index (Q/TF) is low. (4) The aeolian sands of Jiudong Sandy Land are in the initial stage of being basically free from or subject to weak chemical weathering, mainly in the process of strong physical weathering. It is speculated that they were formed in a dry and cold, weak chemical weathering and weak pedogenic environment.

Key words: aeolian sands, particle size, element, mineral, Jiudong Sandy Land

CLC Number: