甘肃北祁连山寒山金矿床控矿条件与成矿模式

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

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。

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 solidifying during the compressionextend climacteric of collision orogenesis,the heatdriving force mainly comes from deep magma chamber or intermediateacidic intrusive bodiesThe genetic type of the deposit is a tectonicaltered gold deposit related to volcanic rocksFrom what has been discussed above,authors summarize and induce metallogenic model and comprehensive prospecting criteria of the deposit