甘肃省金山金矿地质特征及控矿因素

为了研究金山金矿的控矿因素及矿床成因,在研究成矿地质背景的基础上,结合野外地质及前人研究成果,采用地质、地球化学综合分析的方法,对矿区内地层、构造、岩浆岩、矿体特征、稳定同位素、成矿温度压力、成矿流体及微量元素特征进行了剖析。研究表明:金矿严格受断裂控制,断裂是成矿的主导因素;岩浆岩对成矿具有制约作用,岩体外接触带1～5km内的断裂构造是最佳的赋矿位置;地质背景、含金建造与成矿关系密切;矿床形成经历了沉积成岩期、变质成矿期、岩浆热液成矿期、表生成矿期4个阶段。金山金矿床受多因素控制,具有物质多来源,成矿多阶段特点,其成因类型属地下热(卤)水渗滤型金矿床。

Geological Characteristic and Ore-Controlling Factors of Jinshan Gold Deposit,Gansu Province

To probe the ore-controlling factors and origin of Jinshan Gold Deposit, on the basis of studying thegeological background of minerallization, by adopting the comprehensive geological and geochemical method, thispaper analyzes the strata, structure, magmatic rock, ore-body character, stable isotop, temperature, pressureand flouid of minerallization and trace elements in the mining area. It is found that the gold deposit is controlledstrictly by faults which are the leading factor of minerallization, the magmatic rock restricts the minerllization,the fault with the range of 1～ 5 km of external contact zone is the best position for ore location. Moreover, thegeological background and gold-bearing formation are closedly related to minerllization. The formation of mineraldeoposit has undergone four stages, they are, sedimentary-diagenetic stage, metamorphic minerallizaion stage,magma-hydrothermal minerallizaion stage and exogenic minerallizaion stage. Jinshan Gold Deposit is controlled bymulti-factors, poly-matter sources, multi-stages of minerallizaion, and it is a percolated and filtrated gold depositby underground hot(thick gravy)water.