河南西峡石板沟金矿成矿流体地球化学及矿床成因讨论

ORE FORMING FLUID GEOCHEMISTRY AND A DISCUSSION ON ORE GENESIS OF SHIBANGOU GOLD DEPOSIT IN XIXIA, HENAN PROVINCE

石板沟金矿是近年在豫西南发现的一个剪切带容矿的脉状金矿。根据流体包裹体地球化学研究，分析了矿床成矿流体地球化学特征，讨论了金的沉淀机制和矿床成因。构造蚀变岩型金矿的形成主要与热液蚀变作用有关，石英脉型金矿的形成，则可能主要与岩浆热液与变质热液的混合作用有关。矿质主要源自晋宁期岩浆岩，成矿流体和热能主要来自海西期花岗岩。矿床为剪切带容矿的中低温热液金矿床。

Shibangou gold deposit is an mesothermal lode gold deposit hosted by ductile brittle shear zone. In this paper, based on the studies of fluid inclusions trapped in quartzes, the ore forming fluid characteristics are discribed, the depositional mechanisms of Au from ore forming fluid are discussed, and the ore genesis of this deposit is revealed. It is suggested that the formation of structural alteration rock type orebodies may be mainly related with the hydrothermal alteration such as pyritization, sericitization and silicification, and the deposition of gold from ore forming fluids responsible for quartz vein type orebodies may be genetically related with the mixing of magmatic fluid and metamorphic fluid. It has been proved that there appears to be a clear genetic connection between gold mineralization and the magmatism formed at Variscan orogeny stage. The ore forming materials of the deposit, such as Au, originated dominantly from magmatic body named Gangou intrusive body intruded at Jinning orogeny stage and ore forming fluids originated primarily from the intrusive body called Shitangshan granite intruded at Variscan orogeny stage.