马松岭铜矿区变火山-沉积岩系形成环境研究

在搜集前人相关测试数据,对龙门山中段马松岭矿区出露广泛的变火山岩及其准同期变辉绿岩、赋矿火山-沉积围岩进行补充采样和测试基础上,通过岩石地球化学研究,认为马松岭矿区变火山-沉积岩系主体为变岛弧钙碱系列,含少量变大洋岛碱性玄武岩和变正常沉积岩,形成环境为张裂岛弧;彭州式铜矿可能是在VMS型矿胚基础上经后期改造而成;与火山沉积岩系准同期的变辉绿岩为岛弧拉斑系列,因受到不断成熟的过渡壳物质混杂,而主体显高铝系列特征。

Study on the formation environment of metavolcanite-sedimentary rock series in Masongling, Longmenshan, China

Based on the study of previous relevant test data,added sampling and testing on extensively-outcropping metavolcanite and penecontemporaneous diabase,host rocks of volcano-sedimentary in Masongling mining area of mid-segment Longmenshan Mountains,according to research of lithogeochemical,the authors think that the main body of metavolcanite-sedimentary rock in Masongling mining area is calcalkaline series of metamorphic island arc,including a small quantity of alkali basalt and meta-normal sedimentary rock in metamorphic island arc,whose environment is of rifting land arc;Pengzhou type copper deposit maybe developed by subsequent reformation of previous VMS ore deposit;metadiabase which is penecontemporaneous with volcanic-sedimentary rocks series belongs to island arc tholeiitic series.Mixed with transition crust materials continuously,the main body is characterized by high aluminium rock series.