陆相咸化湖泊沉积硫酸盐岩硫同位素组成及其地质意义

The Sulfur lsotope Composition of Sulfate Rock Deposited in Continental Brackish Lakes and its Geological Significance

现代海洋中的硫酸盐矿物和海水硫酸盐本身常有相似的硫同位素组成，因而可根据现代蒸发岩的硫酸盐同位素来判断古环境。据李任伟［１］引用Ｈｏｌｓｅｒ和Ｋａｐｌａｎ及格里年科的资料报道，海相蒸发岩及其所反映的古海洋硫酸盐的硫同位素组成只在较狭窄的范围内变化，现...

This paper studies the suflur isotope co mpost ition of sulfate rock deposited in continental brackish lakes and compares it wi th other sulfur isotope values from different sedimentary environments. It can b e concluded that the sulfur isotope composition of the former is broader than th e later. The former is about 1‰～32.2‰. The values include the sulfur isot ope values of evaporates deposited in oceans. The research points out the origin of evaporates in some basins of the East China and the limitation of sulfur iso to pe used as a criterion of environmental discrimination. The sulfur isotope value of sulfate rock can not distinguish the evaporates of continental brackish lake s from the marine evaporate.