甘肃赵沟金矿床地质特征及控矿因素分析

Geological features and ore-control factor of the Zhaogou gold deposit in Gansu

赵沟金矿是继李坝金矿之后近年发现的大型金矿床。矿床产于秦岭造山带泥盆纪浅变质碎屑岩中,区域地质构造较复杂,岩浆活动频繁且强烈,是一受断裂、岩浆活动和蚀变带控制的蚀变岩型(工业类型为微细粒浸染型)金矿床。矿体严格受断裂破碎带控制,F1断裂破碎带为主要导矿构造,次级的F29断裂破碎带为容矿构造。对矿床地质地球化学特征和控制因素的研究表明,今后找矿的重点应在1级导矿及其旁侧的2级容矿断裂破碎带,中川岩体周边5km的热变质圈内和化探异常发育的地段。

The Zhaogou gold deposit is another large-scale gold deposit found after the Liba gold deposit recent years. It occurred in the epimetamophic detrital rock of Devonian system in Qinling orogenic belt, had complicated regional tectonics and frequent and strongly magmatic activity. The Zhaogou gold deposit was an altered rock type (industrial type is disseminated) gold deposit that controlled by fault, magmatic activity and alteration zone. The ore body is controlled by fracture zone strictly, and the F_1 fracture zone is the major structure as passageway for ore, the secondary F_(29) fracture zone is the host structure. Study on the geological features, geochemical features and ore-control factor show that the main point to ore-finding is the first fracture zone and the secondary fracture zone around it and the place that thermal metamorphic circle and abnormal developed of geochemical prospecting around Zhongchuan rock body in (5 km.)