LAUSR

Abstract Organic-rich source rock was closely related to the development of hydrothermal sedimentation in geochemistry and others. By studying the characteristics of the source rocks of Lower Cambrian Niutitang Formation in Guizhou Province of China, it was found that the strata affected by both terrigenous inputs and hydrothermal sediments. There were a few samples with a low gross amount of REEs, which widely varied in others. The influence of the hydrothermal sedimentation was stronger in Yangtiao and Jiumen sections, while relatively weaker in Lianxing and Wenshui sections. The content of As and Sb enriched in Niutitang Formation, which indicated the existence of the hydrothermal activity. The δEu/Al ratio can be used to distinguish and indicate the intensity of the hydrothermal sedimentation.