Composition and Micro-morphological Characteristics of Aeolian Sand in the Middle of the Mu Us Sandy Land

doi:10.7522/j.issn.1000-694X.2017.00066

Journal of Desert Research ›› 2018, Vol. 38 ›› Issue (3): 473-483.DOI: 10.7522/j.issn.1000-694X.2017.00066

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Composition and Micro-morphological Characteristics of Aeolian Sand in the Middle of the Mu Us Sandy Land

Chen Guoxiang¹, Dong Zhibao^1,2,3, Cui Xujia¹, Xiao Weiqiang¹, Li Lulu¹, Yang Junhuai¹, Shi Weikang¹

1. School of Geography and Tourism, Shaanxi Normal University, Xi'an 710062, China;
2. National Demonstration Center for Experimental Geography Education, Shaanxi Normal University, Xi'an 710062, China;
3. Key Laboratory of Desert and Desertification, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China

Received:2017-08-11 Revised:2017-08-29 Online:2018-05-20 Published:2018-11-06

Abstract

Abstract: In this paper, the grain size, element and micro-morphological characteristics of mobile dune and fixed/semi-fixed dune in the middle of the Mu Us Sandy Land are analyzed. The results show that both the mobile dune and the fixed/semi-fixed dune are composed of fine sand and medium sand, while the sorting of mobile dune is better, and the sorting of fixed/semi-fixed dune is poor. The transport style of dunes is saltation in a frequent and strong wind activity environment, and the way of transportation is fixed and the power of transportation is stable. Compared with UCC, SiO₂ and Na₂O are rich in major elements, others are loss, and Co is enriched obviously for trace element. Values of CIA of dunes are close to the average of the upper continental crust, indicating that the dune has experienced a low degree of chemical weathering. The roundness of mobile dune and fixed/semi-fixed dune is poor, and most of them are angular shape or sub-angular shape, and the real round shape is less; The typical mark of the windy environment is dish-shaped pits accounted for a large proportion, and it is inferred that the climate of the Mu Us Sandy Land is relatively dry, the mechanical action occupies a dominant position while the chemical weathering plays a small role.

Key words: micro-morphology, sediment, grain size, geochemical elements, Mu Us Sandy Land

CLC Number:

P931.3

Chen Guoxiang, Dong Zhibao, Cui Xujia, Xiao Weiqiang, Li Lulu, Yang Junhuai, Shi Weikang. Composition and Micro-morphological Characteristics of Aeolian Sand in the Middle of the Mu Us Sandy Land[J]. Journal of Desert Research, 2018, 38(3): 473-483.

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Composition and Micro-morphological Characteristics of Aeolian Sand in the Middle of the Mu Us Sandy Land

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