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《Acta Sedimentologica Sinica》 2005-04
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Characteristics of Clay Mineral Assemblages and Their Spatial Distribution of Chinese Loess in Different Climatic Zones

SHI Yu-xin 1,2 DAI Xue-rong2 SONG Zhi-guang1 ZHANG Wei-guo3 WANG Li-qun 2 1(State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences,Guangzhou 510640) 2 (Department of Geography, East China Normal University, Shanghai 200062)3(State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062)  
Chinese loess, the Quaternary aeolian deposits in another term, covers a nationwide area from the east China coast to the northwest inland desert. Studies show that the origin of clay minerals bears relation to the formation and evolution of loess. To understand and explain the differences of loess under different climatic conditions, this paper constructs a NWW-SEE cross-section which consists of five representative loess profiles (sites) in central Gansu (Lanzhou), northern Shaanxi (Luochuan), central Shaanxi (Baoji), northern Henan (Jiyuan) and the lower reaches of the Yangtze river (Zhenjiang), respectively. Samples taken from Lanzhou loess and Zhenjiang loess, and also from the present dust-storm deposits were analyzed by using X-ray diffraction system. Preliminary conclusions can been drawn as follows: In both loess and the dust-storm deposits, a number of clay minerals were examined through X-ray diffraction. They are illite, chlorite, vermiculite, kaolinite, smectite group and mixed layer minerals. In Lanzhou loess illite and chlorite are dominant, but in Zhenjiang loess the clay mineral assemblage is illite-vermiculite type. Comparing with other loess profiles ranging between Lanzhou and Zhenjiang, it is found that the clay mineral assemblage changes gradually from northwest to southeast. Along with the latitude getting lower, the content of chlorite decreases, while the content of vermiculite increases. This implies that clay mineral assemblage must have close reference to the climate. The dry and cold climate favors for the formation of chlorite, the warm and humid climate benefits for vermiculite. Furthermore, the content of vermiculite and its interstratified minerals can also be a proxy of weathering intensity. To conclude, the clay mineral assemblage of loess can be used to trace the source of mother material and understand the post-depositional climate conditions.
【Fund】: 国家自然科学青年基金项目(编号:49201016)资助.
【CateGory Index】: P532
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