中国沙漠 ›› 2021, Vol. 41 ›› Issue (2): 9-18.DOI: 10.7522/j.issn.1000-694X.2020.00118

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朱春鸣1(), 董治宝1(), 刘铮瑶1, 肖南1, 杨军怀2, 冯淼彦1   

  1. 1.陕西师范大学 地理科学与旅游学院,陕西 西安 710119
    2.兰州大学 资源环境学院,甘肃 兰州 730000
  • 收稿日期:2020-06-19 修回日期:2020-11-07 出版日期:2021-03-20 发布日期:2021-03-26
  • 通讯作者: 董治宝
  • 作者简介:董治宝( E-mail:
  • 基金资助:

Grain size and micro-morphology characteristics of the surface ediments of dendritic sand dunes in the Gurbantunggut Desert

Chunming Zhu1(), Zhibao Dong1(), Zhengyao Liu1, Nan Xiao1, Junhuai Yang2, Miaoyan Feng1   

  1. 1.School of Geography and Tourism,Shaanxi Normal University,Xi’an 710119,China
    2.College of Earth and Environmental Sciences,Lanzhou University,Lanzhou 730000,China
  • Received:2020-06-19 Revised:2020-11-07 Online:2021-03-20 Published:2021-03-26
  • Contact: Zhibao Dong



关键词: 古尔班通古特沙漠, 树枝状沙丘, 粒度, 微形态, 沉积环境


Dendritic dune is a unique type of dune landform in Gurbantunggut desert. This paper analyzes the grain size and micromorphological characteristics of the surface sediments of the dendritic dunes in the Gurbantunggut Desert. The results show that: (1) The dendritic dunes are dominated by medium sand, followed by fine sand and coarse sand. There is a good linear relationship between the average particle size and the separation coefficient. The smaller the average particle size, the better the sorting coefficient. The sedimentary environment is dominated by rivers and lakes. The shape of quartz grains is mainly round and long and the roundness is moderate. Dished pits are widely distributed and accompanied by the phenomenon of silicon precipitation, indicating that the deposition is mainly mechanical and accompanied by chemical action. (2) On the whole, the coarse sand and extremely coarse sand account for the most in the west while fine sand in the south, which is the result of wind separation. The sorting in the west is better than that in other regions while the sorting in the east is worse. The roundness in the west is the best while the roundness in the south is the worst. The medium sand at the top of the slope accounts for a large proportion. The content of coarse sand on the windward slope is higher than that of the leeward slope while the fine sand and medium sand content at the foot of the windward slope is much higher than that on the leeward slope. The proportion of grain size in the two wings of sand dune is relatively consistent. (3) The characteristics of grain size and micromorphology indicate that the dendritic sand dunes are mainly affected by wind separation as well as by material sources and vegetation, which jointly reveal the sedimentary environment of rivers and lakes.

Key words: Gurbantunggut Desert, dendritic sand dunes, grain size, micro-morphology, depositional environment