|
|
|
篇目详细内容 |
|
【篇名】 |
A preliminary study on the magnetic signatures of modern soil in Central Asia |
|
【刊名】 |
Frontiers of Earth Science in China |
|
【刊名缩写】 |
Front. Earth Sci. China |
|
【ISSN】 |
1673-7385 |
|
【EISSN】 |
1673-7490 |
|
【DOI】 |
10.1007/s11707-007-0034-1 |
|
【出版社】 |
Higher Education Press and Springer-Verlag |
|
【出版年】 |
2007 |
|
【卷期】 |
1
卷3期 |
|
【页码】 |
275-283
页,共
9
页 |
|
【作者】 |
XIA Dunsheng;
JIN Ming;
LIU Xiuming;
CHEN Fahu;
MA Jianying;
ZHAO Hui;
WANG Xunming;
WEI Haitao;
|
|
【关键词】 |
environment magnetism; surface soil; loess; desert; Gobi; Central Asia |
【摘要】 |
|
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 Mrs/Ms versus Bcr/Bc 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. |
|
