The Control Effect of the South Qinling Ocean Evolution on the Material Composition and Sedimentary Environment of Organic-rich Shale: A case study of the Early Paleozoic strata in the northern margin of the Sichuan Basin

Kang Jianwei, CGS China Geological Survey, Chengdu Center, Chengdu, China; CDUT Chengdu University of Technology, Institute of Sedimentary Geology, Chengdu, China