甘肃北祁连山寒山金矿床控矿条件与成矿模式

通过对该矿床成矿地质背景、矿床地质特征、成矿标志及控矿因素等诸方面分析,指出成矿物质主要来源于下奥陶统岛弧钙碱性安山-英安质火山碎屑岩,矿体受多级断裂裂隙系统的控制,且主要定位于韧-脆性剪切带内的强片理化带中,成矿作用发生于碰撞造山作用挤压-伸展转变期,花岗闪长岩、闪长岩等造山期中酸性岩体侵位期间及其以后,深部岩浆房或中酸性侵入体主要为矿床形成提供了热驱动力,矿床成因类型属与火山岩有关的构造蚀变岩型金矿床.在此基础上,总结归纳了该矿床的成矿模式与综合找矿标志.

The ore-controlling conditions and metallogenic model of Hanshan gold deposit in North Qilian Mts.

Hanshan gold deposit is a great gold deposit to be found in North Qilian mountains during the last decade of the twentieth century.By analysing ore-forming setting,geological features,ore-forming marks and ore-control factors of the deposit,authors consider its ore-forming matter mainly comes from calc-alkaline intermediate-acidic pyroclastic rocks of island arc,ore-bodies are controlled by multi-degree faulted system and mainly occurrence in strongly schistosity of ductile-brittle shear zone,mineralization happened in or after the period of intermediate-acidic magma positioning and solidify ing during the compression-extend climacteric of coliision orogenesis,the heat-driving force mainly comes from deepmag machamber or intermediate-acidic intrusive bodies.The genetic type of the depositis at ectonic-altered gold deposit related to volcanic rocks.From what has been discussed above,authors summarize and induce met-allogenic model and comprehensive prospecting criteria of the deposit.