四川省九寨沟草地金矿床地质特征及矿床成因

Geological characteristics and genesis of Caodi gold deposit in Sichuan

四川草地金矿床为位于若尔盖—九寨沟印支—燕山期金矿成矿带内的超微细粒浸染型金矿床。通过对该矿床的地质特征、矿石矿物学特征以及控矿因素的系统研究表明,该矿床受构造断裂带控制,在时空上与印支—燕山期岩浆侵入活动密切相关。容矿岩石主要为古生界泥盆系、石炭系构造角砾岩和蚀变花岗斑岩。矿体主要呈脉状、透镜状、浸染状产出。矿床地球化学研究结果表明,成矿物质主要来源于围岩和深部地壳,属低温热液型金矿床。

Caodi deposit is a superfine-disseminated gold deposit,which lies in the Indosinian-Yanshanian Ruoergai-Jiuzhaigou gold metallogenic belt. A research on the geological characteristics,ore-controlling factors and ore mineralogy features indicates that the deposit is mainly controlled by the structural fault belt and is closely related to the Indosinian-Yanshanian magma intrusion in time and space. The mineralization is held by Devonian and Carboniferous tectonic breccia and altered granite porphyry. And orebodies are mainly in vein,lenticular and disseminated forms. Geochemical studies show that the metallogenetic materials mainly came from wall rock and deep crust,and the deposit is a low temperature hydrothermal gold deposit.