四川盆地南部五峰组页岩元素特征对古构造及古环境的指示意义

Element Characteristics of Shale in Wufeng Formation in Southern Sichuan Basin Indicating Significance of Paleo-tectonic and Paleoenvironment

选择了四川省文兴县三新砖厂奥陶系五峰组8件露头剖面的页岩样品进行Sr、Ba、Ga、V、Ni、Co、U、Th及Fe、Mn等主、微量元素分析测试。通过运用元素地球化学研究方法 ,对研究区五峰组的古构造等沉积环境进行分析、还原。分析结果表明研究区页岩沉积期古水深较浅,古盐度较低,指示水体环境为淡化的海水沉积。

Eight shale samples from Ordovician Wufeng formation in Sanxin brick factory of Wenxing county in Sichuan province were selected for St, Ba , Ga, V, Ni, Co, U, Th and Fe, Mn, other main and trace elements analysis. Through the application of elemental geoehemistry research methods, the depositional environment such as the paleofacial structure of the Wufeng formation in the study area is analyzed and restored. The analysis results show that the shale in the study area has a pale ancient water depth and a low ancient salinity, indicating that the water environment is desalinated seawater.