Characteristics of sulfur species and their implications in Lower Cambrian black shales from southern margin of Yangtze Platform

摘要

there are different sulfur forms in the black shales from the Early Cambrian of the Yangtze platform. With its emphasis on pyrite and organosulfur, this paper discusses their distribu- Tion and formation. The research shows that sulfur phases take regular variations laterally as well As vertically in the research areas. In western researched profile with high terrigenous supply at The time it formed, there exists a larger amount of pyrite and less organosulfur, and pyrite amount Declines while organosulfur content increases upwards along the profile. This black shale profile is Characterized by relatively light sulfur isotope composition with evolution trend of becoming heavier Both for pyrite and organosulfur from bottom to to along the profile.