柬埔寨 KW 铜金矿床地质特征及控矿条件

摘要

柬埔寨 KW 铜金矿床产于安山质火山岩中,矿化受 NE-NNE 向断裂控制,为中低温热液脉型矿化；矿体一般长80~640m,厚0.13~7.05m,品位 Cu0.56%~3.48%,Au0.36×10-6~2.56×10-6；矿石金属矿物以黄铜矿、黄铁矿、毒砂为主,非金属矿物以石英为主,含少量绢云母、绿泥石、方解石等,近矿围岩蚀变以硅化-绢云母化-绿泥石化。矿区安山岩属高钾低钠的钙碱性岩类,矿石与安山岩有相似的稀土配分特征,显示成矿与安山质岩浆活动有密切的成因联系。矿区青磐岩化、细脉状石膏较为普遍,显示可能存在与次火山岩体有关的蚀变岩型矿化,该类型矿化是下一步找矿突破的重要方向。%KW copper gold deposit in Cambodia is controlled by NE-NNE trending faults in the andesitic vol-cano rocks,with hydrothermal vein type mineralization of low to moderate temperature.The orebody is gen-erally 80~640 meters long,0.13~7.05 meters thick,with grade Cu 0.56%~3.48% and Au(0.36~2.56) ×10 -6 .The metal minerals are mainly chalcopyrite,pyrite and arsenopyrite.The non-metallic mineral is mainly quartz with a small amount of sericite,chlorite and calcite.The wall rock alterations are silicification, sericitization and chloritization.Andesite is belonged to calc alkaline type with high potassium and low sodi-um.The ore is similar to andesite in REE pattern characteristics.The mineralization has close genetic rela-tionship with andesitic magma activity.For propylitization,veinlets gypsum are relatively common in the mine,it suggests that the altered rock type mineralization is possibly related to the volcanic rock.The miner-alization type is an important direction for the prospecting achievement in the future.