青海五龙沟金矿矿床成因及成矿模式探讨

Genesis and Metallogenic Model of the Wulonggou Gold Deposit in Qinghai Province

五龙沟金矿是青海省东昆仑成矿带最具找矿潜力的矿床,分析和研究五龙沟地区金矿床成因、成矿模式对于确定该区成矿类型及进一步找矿工作具有重要的指导和借鉴意义。通过收集五龙沟地区金矿床成矿大地构造背景、区域地层、岩性、构造、岩浆岩等方面的资料,首先对区内红旗沟-深水潭、百吨沟、岩金沟典型金矿床特征进行了描述;然后从地层、岩浆岩、构造3个方面对控矿因素和矿床成因进行了系统的分析,认为五龙沟金矿床经历了长期及多期次的成矿阶段,复杂的构造演化使金矿床的形成与地层、岩浆岩、构造关系密切。在分析控矿因素和矿床成因的基础上,建立了金矿床成矿模式,揭示了成矿地质因素,直观地反映了五龙沟地区金矿床具有多来源、多成因、多阶段矿化的变化和发展过程。

The Wulonggou gold deposit is the most potential deposit for prospecting in Eastern Kunlun metallogenic belt of Qinghai Province. The analysis and study on the genesisand metallo- genic modelof the Wulonggou gold deposit have some important guidance and reference for defi- ning the mineralization type and carrying out the further ore-prospecting work. After collecting the geological data of the Wulonggou gold deposit, such as ore-forming tectonic background, regional strata, lithological characters, geological structureand igneous rocks, the geological characteristics of typical gold-polymetallic deposits （Hongqigou-Shenshuitan, Baidungou and Yanjingou deposits） in this area have been described respectively. And then, the ore-controlling factors and ore deposit genesis of these deposits have been analyzed systemically from the aspects of strata, magmatic rocks and structure. The results show that the Wulonggou gold deposit has experienced a long and many times of metallogenic stage. The complex tectonic evolution causes the formation of Wulonggou gold deposit, which has a close relationship with strata, magmatic rocks and tectonic. On the basis of analyzing the ore-controlling factors and ore deposit genesis, the metallogenic model of the Wulonggou gold deposit has been established, and the relevance geo- logical factors for mineralization have been revealed, which intuitively reflect the change and development process of the Wulonggou gold deposit with multiple sources, polygenetic and multistage mineralization.