东准噶尔蒙西铜矿床成因类型及成矿模式初探

The Preliminary Study about the Genetic Types and the Metallogenic Model of MengXi Copper in East Junggar

蒙西铜矿是新疆东准噶尔琼河坝地区规模较大的低品位隐伏铜矿，地表矿体为产于斜长花岗斑岩脉内的细脉状铜矿（化）体，深部为隐伏的大规模似层状铜矿体，主要产于中-上奥陶统荒草坡群一套浅海相火山碎屑岩内，具两期成矿特征。早期为火山沉积成矿期，受区域左行韧性剪切带控制；晚期为热液成矿期，成矿作用受NW向F2断层控制。从沉积相、地球化学、构造、热液蚀变特征及成矿物质来源分析认为蒙西铜矿为火山沉积＋热液改造型铜矿。

MengXi copper mine is a larger low grade concealed copper ore found in the Qiongheba area,East Junggar of Xinjiang. its surface orebody manifests as the stringer veins copper （change） body native to Inclined-long Granite rock spot.And the deep is concealed lay-like structures copper body, mainly from neritic facies pyroclastic rocks of O2.3.1t has the metallogenic features of two period.The early one is volcanic sedimentary metallizing period, controlled by shear zone of regional left ductile;The Late is hydrothermal period,mineralized by the control of NW to F2 fault. So,MengXi is a copper mine for volcanic sedimentary and Hydrothermal modification type.