Clay Rocks around Permian-Triassic Boundary at Daxiakou Section in Hubei Province,China  

作　　者：张素新 袁鹏 赵来时 童金南 杨浩 于吉顺 史玉芳 

机构地区：[1]State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences [2]Faculty of Earth Sciences, China University of Geosciences [3]State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences

出　　处：《Journal of Earth Science》2009年第6期909-920,共12页地球科学学刊（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos. 40872003, 40972003, 90714010, 40839903, 40730209);the MOST Special Fund from the State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences

摘　　要：We studied the clay rocks around the Permian-Triassic boundary at the Daxiakou （大峡口） Section in Xingshan （兴山）, Hubei （湖北） Province, China. All clay rocks are predominated by illitemontmorillonite （I/M） mixed-layer minerals, and high-temperature hexagonal bipyramid （HB） quartz and pyrite are contained in different abundances. Clay microspheres are even found in some beds. The results show that volcanic activity was very frequent in this area or in the neighboring areas during the Permian-Triassic transition though the intensity of eruption and the position of the eruption center might have varied during the period. The frequent volcanic activity should be at least one of the leading events to cause the momentous turnover of biota and the ecosystem during the great Permian-Triassic transition.We studied the clay rocks around the Permian-Triassic boundary at the Daxiakou （大峡口） Section in Xingshan （兴山）, Hubei （湖北） Province, China. All clay rocks are predominated by illitemontmorillonite （I/M） mixed-layer minerals, and high-temperature hexagonal bipyramid （HB） quartz and pyrite are contained in different abundances. Clay microspheres are even found in some beds. The results show that volcanic activity was very frequent in this area or in the neighboring areas during the Permian-Triassic transition though the intensity of eruption and the position of the eruption center might have varied during the period. The frequent volcanic activity should be at least one of the leading events to cause the momentous turnover of biota and the ecosystem during the great Permian-Triassic transition.

关 键 词：volcanic activity Permian-Triassic boundary Daxiakou Section Hubei Province. 

分 类 号：P534.4[天文地球—古生物学与地层学]