Sedimentary records and geological significance of deep-water facies from Changhsingian, Hongchiba section in Wuxi County, Chongqing
Yang Wei1, Zhang Ting-Shan2, 3, Yang Yang2, 3, Mao Kai-Nan1, Zhang Hua-Xin2
1 School of Resources and Environmental Engineering,Guizhou Institute of Technology,Guiyang 510003,Guizhou; 2 School of Geosciences and Technology,Southwest Petroleum University,Chengdu 610500,Sichuan; 3 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University, Chengdu 610500,Sichuan
Abstract：The deep-water sediments were well developed along the Hongchiba section in Wuxi County,Chongqing,which is represented by a series of Upper Changhsingian conodonts and deep shelf trace fossils. Based on the assemblage zone of conodont observed from the Hongchiba section,the Upper Changhsingian sedimentary feature and facies were investigated,and the controversial viewpoints on the boundary between Dalong Formation and Changxing Formation were discussed. During the Middle-Late Changhsingian,the sedimentary environment shifted gradually from a deep-water basin to a deep-water shelf, giving rise to unstable marine ecological environment. The analysis of trace fossil records with time series points to the unstable fluctuation change of oxygen levels in deep-water shelf facies through the Middle-Late Changhsingian. It also reflects the interaction between biology and environment when the critical geologic interval has been approaching.
Yang Wei,Zhang Ting-Shan,Yang Yang et al. Sedimentary records and geological significance of deep-water facies from Changhsingian, Hongchiba section in Wuxi County, Chongqing[J]. JOPC, 2018, 20(3): 377-388.
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