| 古气候与环境演变 |
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| Magnetic Property and Paleoclimatic Implication Recorded by AXK Sequence in West Tianshan Area |
| JIA Jia1, XIA Dun-sheng1,2, WEI Hai-tao1, JIN Ming1, LIU Xian-bin1, WANG Bo1 |
| 1.Key Laboratory of West Chinas Environmental Systems, Lanzhou University, Lanzhou 730000, China; 2.Key Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China |
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Abstract The magnetic property of loess is widely used on paleoclimate research. In the Loess Plateau of China, it appears positive correlation with climate. This phenomenon also appears in European loess sediments. But, the magnetic significances of loess sediments in some areas don't correlate with climatic conditions, or negatively correlate with climate, such as in Yili area, Xinjiang of China. This paper chose the AXK loess sequence located in the east of Yili area as research object. The deposition of the thick loess sediments in this area started since the last interglacial period. Results showed that magnetite, maghemite, hematite and goethite were discovered in the loess sequence, and the property of magnetite and maghemite controlled magnetic property of the loess layer, so ferrimagnetism was the major magnetic mineral of the loess sequence. Further analysis showed multidomain and pseudo-single domains were the major sharp of ferrimagnetic particles, and the content of single domain and superparamagnetic domain increased with the increase of soil development level. But the content of ferrimagnetism didnt appear correlation with the soil development level. The analysis of mechanism of magnetic susceptibility enhancement showed that magnetic susceptibility was affected by many factors, such as magnetic property of origin, soil development level, oxidative-reductive environment, and so on.
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Received: 10 August 2010
Published: 20 November 2011
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2011, Vol. 31 
