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A magnetic investigation of a loess/paleosol
sequences record in Ili area |
| Jia JIA1,Haitao WEI1,Bo WANG1,Xianbin LIU1,Dunsheng XIA2, |
| 1.Key Laboratory of West
China’s Environmental System (Ministry of Education), Lanzhou
University, Lanzhou 730000, China; 2.Key Laboratory of West
China’s Environmental System (Ministry of Education), Lanzhou
University, Lanzhou 730000, China；Key Laboratory of Desert
and Desertification, Institute of Cold and Arid Regions Environmental
and Engineering, Chinese Academy of Sciences, Lanzhou 730000, China; |
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Abstract The pedogenic ferrimagnetic minerals have been considered to be the cause of magnetic susceptibility enhancement in loess deposits distributing in the Chinese Loess Plateau and Central Europe, while “wind intensity” mechanism is proposed to be responsible for the magnetic susceptibility enhancement of loess in Alaska and Siberia. However, the magnetic enhancement mechanism is still open for loess in Ili valley, Xinjiang Uygur Autonomous Region, China. To understand this, we conducted a rock magnetic investigation on Axike section that is located in Ili valley. Results show that transitional stage from magnetic (χlf) trough to magnetic (χlf) peak corresponds to soil units. The PSD and MD-grained magnetite dominate the magnetic properties of AXK sequences, and the main factor affecting magnetic properties is the concentration of ferrimagnetic fraction. For the “pedogenesis enhancement” and “wind intensity” model, it seems hard to explain the magnetic susceptibility enhancement in this area. For the concentration of fine-grained magnetite in magnetic mineral shows positive relationship with the intensity of pedogenesis, the magnetic parameters of loess deposit in Ili valley can be used to recover paleoclimatic variations.
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| Keywords
magnetic property
pedogenic intensity
loess sequences
Ili valley
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Issue Date: 05 September 2010
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