Geochemical Characteristics and Geological Significance of Black Shale at the Bottom of the Mufushan Formation in the Lower Cambrian, Lower Yangtze Platform, South China

Black shale, as an important unconventional energy resource, has attracted significant attention in recent years. By studying its sedimentary and geochemical characteristics, it is possible to reconstruct ancient depositional environments paleoclimatic conditions. The Lower Cambrian black shale widely distributed the Yangtze region, but tectonic background provenance have been subject debate. In this study, we conducted testing analysis on samples collected from basal of Mufushan Formation section, Nanjing. Th/Sc-Zr/Sc diagram indicates that not undergone recycling. Analysis major element ratios, rare earth (REE) distribution patterns, δEu, (La/Yb)N, La/Th-Hf La/Yb-∑REE discrimination diagrams suggest source rocks mainly consist granites rich ferromagnesian minerals, representing felsic derived upper crust, with some involvement mafic rocks. Considering attributes, geological age relationships, evolution South China continent, granite component inferred formed during Neoproterozoic magmatic activity, area corresponds Jiangnan Orogenic Belt. K2O + Na2O-SiO2, K2O/Na2O-SiO2/Al2O3, La-Th-Sc, Th-Co-Zr/10, Th-Sc-Zr/10 suggests was a passive continental margin.