Sedimentation on a Carbonate Slope of Permian Qixia Formation in Chaohu Region, Anhui

LI Shuang-ying; YUE Shu-cang

The carbonate rocks of Qixia Formation developed extensively on the Lower Yangtze Region have been considered to be deposits of shallow sea carbonate platform for along time. The study indicates, in the case of Chaohu Region, that deposits of Qixia Formation occur mostly in carbonate slope environment. Bedded limestone conglomerates of Swine Limestone and the top limestone members are products of carbonate debris flows and develop on the upper of the carbonate slope. Calcarenite silicon-wackestone of the upper and lower silicon members deposit from contour currents and occur on the lower of the carbonate slope. Calcium-silicon shale (mudstone) developed on the upper and lower silicon members forms in the end of slope and basin environment. Only the limestone of the middle limestone member may deposit in shallow sea carbonate platform environment. This breaks through the traditional idea and is helpful for understanding paleogeographic features and tectonic evolution of Lower Yangtze Plate in Permian period

Department of Natural Resources and Environmental Science,Hefei University of Technology Hefei 230009

Received Date: 2001-02-26

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Abstract: The carbonate rocks of Qixia Formation developed extensively on the Lower Yangtze Region have been considered to be deposits of shallow sea carbonate platform for along time. The study indicates, in the case of Chaohu Region, that deposits of Qixia Formation occur mostly in carbonate slope environment. Bedded limestone conglomerates of Swine Limestone and the top limestone members are products of carbonate debris flows and develop on the upper of the carbonate slope. Calcarenite silicon-wackestone of the upper and lower silicon members deposit from contour currents and occur on the lower of the carbonate slope. Calcium-silicon shale (mudstone) developed on the upper and lower silicon members forms in the end of slope and basin environment. Only the limestone of the middle limestone member may deposit in shallow sea carbonate platform environment. This breaks through the traditional idea and is helpful for understanding paleogeographic features and tectonic evolution of Lower Yangtze Plate in Permian period

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Sedimentation on a Carbonate Slope of Permian Qixia Formation in Chaohu Region, Anhui

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