A preliminary study on the magnetic signatures of modern soil in Central Asia |
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| Authors: | Xia Dunsheng Jin Ming Liu Xiuming Chen Fahu Ma Jianying Zhao Hui Wang Xunming and Wei Haitao |
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| Institution: | (1) Key Laboratory of Desert and Desertification, Institute of Cold and Arid Regions Environmental and Engineering, Chinese Academy of Sciences, Lanzhou, 730000, China;(2) CAEP, Key Laboratory of West China’s Environmental System (Ministry of Education), Lanzhou University, Lanzhou, 730000, China |
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| Abstract: | In this study, magnetic techniques were used to characterize the surface soil from different geomorphologies (i.e., sand desert,
oasis, Gobi, and dry lake) in Central Asia. Results demonstrate that the main magnetic minerals in the surface soil are magnetite,
maghaemite and haematite with some paramagnetic materials. Cross plots of M
rs/M
s versus B
cr/B
c and χfd% versus χarm/saturation isothermal remanent magnetization (SIRM) indicate that the main magnetic grain sizes in surface soil are pseudo
single domain (PSD) and multidomain (MD). The samples from West China (i.e., Tarim basin and Junggar basin) are dominated
by magnetic minerals with larger grain size, while those from North China (i.e., Alxa plateau, Erdos plateau, and Mongolia
plateau) are dominated by fine magnetic minerals. The similarity in magnetic mineral constitutions between the Chinese loess
and the surface soils from Central Asia implies that the loess originated from a vast area of arid, semi-arid regions of Central
Asia. The low value of concentration-dependent magnetic parameters indicates that the low concentration of magnetic minerals
in the surface soils from Central Asia and the magnetic enhancement from the pedogenic take place in both the loess and the
paleosols, although the progress is stronger in the latter.
Translated from Quaternary Sciences, 2006, 26(6): 937–946 译自: 第四纪研究] |
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| Keywords: | environment magnetism surface soil loess desert Gobi Central Asia |
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