Sedimentary Facies Analysis of Xujiahe Formation in Tanba Section of Hechuan District,Chongqing City
The Xujiahe formation of the Tanba section in Hechuan district,Chongqing city is well developed and has clear sequence,which is an ideal section for studying sedimentary facies.Based on the summary of previous study,this paper conducts field investigation and research on the Xujiahe formation of the Tanba section in Hechuan.By analyzing the sedimentary structure,sedimentary sequence,petrological characteristics and biological assemblages of the section,this paper summarizes the sedimentary facies types of the Xujiahe formation in the Tanba section.The sedimentary facies types can be divided into lake facies and braided river delta facies,including braided delta front sub-facies,shallow lake sub-facies and semi-deep lake sub-facies.Furthermore,they can be subdivided into five microfacies,including river mouth sandbar,shallow lake mud,shallow lake sand bar,underwater distributary channel and interdistributary channel.
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