西天山元古界的热液沉积岩及其与成矿的关系

在西天山中元古界蓟县系首次发现硅质岩、钾长岩和透辉岩等热液沉积岩,其中钾长岩和透辉岩在国内外极为少见。通过对这些热液沉积岩的地球化学特征的综合研究,确定这些热液沉积岩为海底喷气—沉积成因。最后,表文还分析了该热液沉积岩形成的构造背景和沉积环境以及与铜矿化的成因联系。根据金属硫化物的硫同位素组成和微量元素组成特征进一步说明热液沉积岩和金属硫化物的主要物质来自深部地层中循环的同生热液。

THE HYDROTHERMAL SEDIMENTARY ROCKS AND THEIR RELATIONSHIP WITH MINERALIZATION IN PROTEROZOIC ERA IN WEST TIANSHAN

The hydrotermal sedimentary rocks, including silicic and rocks which consist of potash feldspar and diopside, are first discovered in Jixian system of Middle Proterozoic Era in West Tianshan. The hydrothermal sedimentary rocks are considered to be of submarine exhalative-sediments in origin based on their occurrence, petrochemistry, microelement, REE, and oxygen isotopes. Finally, the tectonic setting and the sedimentary environment of forming these hydrothermal sedimentary rocks and their genetic relationship with Cu-mineralization are researched. The composition of sulfur isotopes and microelements of the ore sulfides further suggests that the major materials of the hydrothermal sedimentary rocks and the ore sulfides came from the circulating syngenetic hydrothermal fluid in the deep strata.