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Journal of Desert Research ›› 2020, Vol. 40 ›› Issue (2): 33-42.DOI: 10.7522/j.issn.1000-694X.2019.00094

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The characteristic of grain size end members in Kumtagh Desert and its implication for sediment source

Liang Aimin1,2, Qu Jianjun1,3, Dong Zhibao4, Su Zhizhu5, Wu Bo6, Zhang Zhengcai1, Qian Guangqiang1, Gao Junliang7, Pang Yingjun6, Zhang Caixia1   

  1. 1. Key Laboratory of Desert and Desertification, Northwest Institute of Eco-Environment and Resource, Chinese Academy of Sciences, Lanzhou 730000, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China;
    3. Northwest National Key Laboratory Breeding Base for Land Degradation and Ecological Restoration, Ningxia University, Yinchuan 750021, China;
    4. School of Geography and Tourism, Shaanxi Normal University, Xi'an 710119, China;
    5. School of History and Culture, Shanxi University, Taiyuan 030006, China;
    6. Institute of Desertification Studies, Chinese Academy of Forestry, Beijing 100091, China;
    7. Experimental Center of Desert Forestry, Chinese Academy of Forestry, Dengkou 015200, Inner Mongolia, China
  • Received:2019-07-30 Revised:2019-11-01 Online:2020-03-20 Published:2020-04-26

Abstract: Research on the grain size of desert sediment has been extensively and maturely conducted, however, extracting sediment transport and source information from grain size data is still weak. Herein, we applied end member modeling analysis to separate end members from grain size distributions data of sediment (including dune and interdune) in the Kumtagh Desert, and combined dynamic feature, spatial patterns of these end members and their relationship to the potential sources, aiming to identify source areas. The results show that the EM1 represents the relative fine saltation load which is the combination of Sanlongsha sand, yardang sand and alluvial deposits of Altyn Tagh Mountains; EM2 represents the aeolian saltation load which is completely contributed from Sanlongsha and yardang sediments; and EM3 represents the reworked alluvial deposits which is completely derived from Altyn Tagh Mountains. The spatial patterns of these end members and their comparison to potential sources indicate that Sanlongsha, yardang and alluvial deposit of Altyn Tagh mountains provided sediments to both dune sand and interdune in Kumtagh Desert, therein, dune sand was mainly transported from northern Sanlongsha and yardang area, while interdune sands was mainly delivered from southern Altyn Tagh Mountains. In addition, based on the analysis for EM1, we are inclined to that interdune can provide source materials for dunes in some grain size and in some local areas of Kumtagh Desert.

Key words: grain size, end member modeling analysis, provenance analysis, Kumtagh Desert

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