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  • CN 62-1070/P
  • ISSN 1000-694X
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Magnetic Characteristics of Aeolian Sand and Ancient Underwater Sediments and Their Implications in Alxa Region of China

  • Wang Youjun ,
  • Jia Jia ,
  • Gao Fuyuan ,
  • Lu Hao ,
  • Liu Hao ,
  • Xia Dunsheng
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  • College of Earth and Environmental Sciences/Ministry of Education Key Laboratory of Western China's Environmental Systems, Lanzhou University, Lanzhou 730000, China

Received date: 2015-12-23

  Revised date: 2016-03-01

  Online published: 2017-07-20

Abstract

Geological evidence and satellite observation usually obtained difference conclusion in tracing source of Chinese loess.It is widely observed that the southern Mongolia and Alxa Region are most frequent sandstorms outbreak regions where a huge number of loess-silt particles could be transported and deposited in Chinese Loess Plateau.However,environmental magnetism and geochemical evidences of district surface soil didn't support this result.It is clear that the wind sorting exists in sandstorms which must provide most material of Chinese Loess Plateau and this process may lead to different characteristics between sedimentary deposits and provenances.In this paper,aeolian sand and ancient underwater sediment samples had been collected from Alxa Region,and the environmental magnetism parameters are determined.The results suggest that:(1) Aeolian sand and ancient underwater sediments show similar magnetic characteristics in coarse particles (63-1 000 μm),but obviously different in fine particles (≤ 63 μm).It may be caused by wind sorting.(2) Ancient underwater sediments show low concentration of high coercivity magnetic minerals which indicates weak mineral transformation during post-deposit period.It indicates that the ancient underwater sediments can be used to detect source in Alxa Region.(3) By comparing magnetic characteristics of fine particle between Alxa Region sediment and loess,we observed that loess show obviously different with aeolian sand but similarity with ancient underwater sediments,which reveals great potential to trace loess source.

Cite this article

Wang Youjun , Jia Jia , Gao Fuyuan , Lu Hao , Liu Hao , Xia Dunsheng . Magnetic Characteristics of Aeolian Sand and Ancient Underwater Sediments and Their Implications in Alxa Region of China[J]. Journal of Desert Research, 2017 , 37(4) : 626 -634 . DOI: 10.7522/j.issn.1000-694X.2016.00026

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