吉林珲春小西南岔金-铜矿床控矿因素研究

摘要

小西南岔金-铜矿位于兴蒙造山带东端,其矿化类型可分为大脉型及细脉带型。矿脉空间产出主要受北北西向压扭性断裂构造控制,矿体则由充填于断裂裂隙中的含金-铜石英-多金属硫化物脉及其两侧围岩中的细脉浸染状矿化体构成。断裂构造是控制小西南岔金铜矿床主要的控矿因素,尤其区内北西向断裂构造控制矿体展布,与矿体规模呈正相关关系。区内闪长岩和闪长玢岩脉与成矿关系密切,是矿体直接围岩。矿体赋存在闪长玢岩脉上下盘中和其内部,所以岩浆活动为金、铜成矿提供了物质来源。%Xiaoxinancha gold-copper deposit is located in the Eastern of Xingan-Mongolian orogenic belt.The mineralization types can be divided into large quartz vein type and fine quartz veinlet type.The gold-copper ore veins were controlled by NNW direction compression-shearing faults.The ore veins are composed of the quartz-polymetallic sulfide vein of contain gold-copper and the veins veinlet-disseminated ore bodies in wall rocks.The main factors of controlling ore are faults in Xiaoxinancha gold-copper deposit,especially NW direction controlling distribution of ore bodies,the scale of ore bodies positively correlativity with fault size.There are a close relationship between diorite,diorite-porphyrite dike and metallogeny,being the immediacy wall rock of ore bodies.The ore bodies occurred in footwall and hangjngwall of diorite-porphyrite dike or in diorite-porphyrite dike,the magma activities provided a ore-forming materials of gold-copper ores