宁夏西华山柳沟金矿地质特征及成矿地质条件分析

Geological characteristics and metallogenic geological conditions of the Liugou gold deposit in Xihuashan,Ningxia

西华山柳沟金矿位于北祁连优地槽褶皱带的东端,赋矿地层为一套中元古界海原群(P t2hy)中的深程度变质岩系。矿体受深大断裂的次级断裂NE向和近EW向张性或先压扭后转换为张扭性断层控制;深大断裂带的长期活动,形成了多期矿化和多组含矿组合构造。主成矿期与加里东期沿深大断裂带侵入的中酸性花岗岩体热力作用有关;成矿表现为金的多期次、多来源富集作用;主要的金矿化类型应为构造蚀变岩型和沿破碎带充填的晚期(黄铁矿化)石英脉型,构成了区域内的主要矿(化)体。因此,多期活动的构造—热液作用在西华山地区具有非常重要的找矿意义。

The Liugou gold deposit in Xihuashan locates on east end of the eugeosyncline fold belt lied in north Qilianshan,the ore-bearing strata of which is a set of moderate-deep metamorphic rock series of Mesoproterozoic Haiyuan Group (Pt2hy).The orebodies are controlled by NE trending and nearly EW trending tensional faults or the ones that were compressional-torsional at first and changed to tensional-torsional faults later.Long-term activities of the deep and major fault formed a structure with multistage miner...