甘肃北山南泉银金矿床地质特征及控矿因素分析

Analysis of the Geological Characteristics and Mineral Control Factors of the Nanquan Silver and Gold Deposit in Beishan,Gansu Province

南泉银金矿床位于北山多金属成矿带,成矿地质条件良好。研究表明:南泉银金矿床初步圈定银矿体7条,银金矿体2条,以层状、似层状矿体为主,矿化较均匀,规模大,受北西—南东向展布的层间破碎带控制明显;矿体主要赋存在中—上奥陶系西双鹰山群结晶灰岩中,与华力西期花牛山复式岩体具有成因联系;矿床围岩蚀变发育,围岩蚀变叠加的区域银金矿化富集,反之则品位较低,且蚀变具有明显的空间分布规律。

Nanquan silver and gold deposit is located in the polymetallic mineralization zone of Beishan,and the geological conditions of mineralization are good.The research shows that:The preliminary circle of the silver gold deposit in Nanquan 7 silver ore body,2 silver gold ore body,mainly layer-like,layer-like ore body,mineralization is more uniform,large-scale,by the north west-south eastward spread of the inter-layer crushing belt control obvious;In the crystalline limestone of the Xishuangying Mountain group of pottery system,there is a causal relationship with the duplex rock body of Hua-niushan,and the mineralized development of the surrounding rock,the regional silver-gold mineralization rich in the surrounding rock erosion overlay,on the other hand,the taste is low,and the erosion has obvious spatial distribution law.