Mudstones in the Upper Permian coal-bearing series in eastern Yunnan and western Guizhou： Clay minerals composition and their environmental significance
Luo Zhong1,2, Shao Longyi1, Yao Guanghua3, Deng Guangming4, Wang Hao1, Han Jun1
1 Department of Resources and Earth Sciences，China University of Mining and Technology(Beijing)，Beijing 100083 2 Central Laboratory of Geological Sciences，Research Institute of Petroleum Exploration & Development， PetroChina，Beijing 100083 3 Chongqing Institute of Geology and Mineral Deposits, Chongqing 400042 4 No.136 Exploration Team of Chongqing，Chongqing 401147
Abstract：The Upper Permian coal-bearing series in eastern Yunnan and western Guizhou，China，were formed in a continental to a marine-nonmarine transitional setting，which are also reflected in the clay minerals of the mudstones. The clay minerals in these mudstones are predominantly kaolinite and illite/smectite mixed-layer followed by illite and minor amount of chlorite and smectite. Kaolinite concentrates in the middle-lower part of the sections(the middle and lower members of Xuanwei Formation and the whole Longtan Formation) both in the Housuo Coal Mine of Fuyuan，eastern Yunnan，and the Panguan Coal Mine of Panxian，western Guizhou. Illite has a higher proportion both in the upper part(Changxing Formation)and the lower part(lower member of Longtan Formation),and a lower proportion in the middle part(upper member of Longtan Formation)of the sections in Zhijin Coal Mine areas of western Guizhou. Illite/smectite is the dominant clay mineral in the mudstones of the three sections in Housuo，Panguan and Nayong Coal Mine areas，and has a high proportion in the middle part of the section, showing a negative correlation with the illite in the Zhijin Coal Mine area. Smectite is of little abundance，and presents only in the upper and lower parts of the two sections at the Panguan and Zhijin Coal Mine areas. These stratigraphic distributions of the clay minerals are believed to be the response of the palaeogeographic evolution，that is, the transgression during the Early Longtan stage and regression during the Late Longtan stage，and a new more extensive transgression during the Changxing stage. From west to east，i.e. from the alluvial fluvial system in eastern Yunnan，across the upper delta plain in Panguan Coal Mine and the upper and lower delta plain transitional zone in Nayong Coal Mine，to the lower delta plain and tidal plain in Zhijin Coal Mine，the kaolinite abundance significantly decreases，while illite abundance gradually increases.
Luo Zhong,Shao Longyi,Yao Guanghua et al. Mudstones in the Upper Permian coal-bearing series in eastern Yunnan and western Guizhou： Clay minerals composition and their environmental significance[J]. JOPC, 2008, 10(3): 297-304.
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