铜厂铜矿稳定同位素研究

STUDY ON THE STABLE ISOTOPE IN TONGCHANG COPPER DEPOSIT, SHANXI PROVINCE

本文通过对铜厂铜矿的S,H,O和C同位素地球化学研究,认为本矿床属于与闪长岩有关的中低温硫化物矿床。在成矿阶段的初始热液为岩浆水,含矿流体是一种岩屑水与天水混合而成的富含K+ 的混合流体,矿床中S主要来源于细碧岩,部分来源于闪长岩,推测成矿物质也来源于细碧岩。海西期闪长岩侵入,带来的气液和热使细碧岩发生蚀变,造成Cu 等成矿物质活化,其中的部分重硫也随之进入成矿流体中,在闪长岩体的内外接触带中,成矿物质形成硫化物沉淀,因此本矿床以富重硫为特征,这种富重硫的成矿流体也使矿体围岩(蚀变闪长岩)富集重硫。

Research on the isotopic geochemistry of S, H, O and C for Tongchang copper deposit reveals that the initial hydrothermal solution came from the magmatic water and the ore-forming solution was a kind of K + rich mixture of magmatic water and atmospheric water. The sulfur in the ore was mainly originated from spilite and part of it came from diorite. The intrusion of the Hercgnian period diorite brought about the alteration of spilite and heary S and activated Cu in spilite entered hydothermal solution which migrated to the inner and outer contact zone of diorite, where they precipitated to form sulfide. Therefore, the Tongchang copper deposit is characterized by the enrichment of herary sulfur.