滇东北铅锌成矿带成矿条件分析

滇东北地区铅锌矿产资源丰富,就其原因可归于区内具有特征性地质环境:含矿地层是一套局限性滨-浅海环境沉积作用形成的以碳酸盐为主与砂、泥岩层呈不等厚交替出现的沉积建造,区内有较好的含矿层(碳酸盐层)与遮挡层相结合的地层成矿条件;矿区地质构造复杂,因经历了多期的构造运动,形成近于等间距排列的逆冲推覆体构造及与之相伴生的次级断裂和褶皱构造;同时,多期次的构造运动,也引起岩浆多次沿深大断裂发生侵入或喷发作用;在成矿作用上,复杂、多层次的地质构造为成矿作用提供了不同类型的导矿、容矿构造,岩浆作用一方面为成矿提供物源,另一方面为成矿作用提供热动力,为矿液加热,促使成矿热液得以循环运动,从而在有利部位发生交代作用而成矿。

Analysis on Metallogenic Condition of Lead Zinc Ore Deposits in Northeast Yunnan Province, China

The formation of lots lead-zinc ore deposits in northeastern Yunnan province is due to its favorable geological conditions：the wall-rock is mainly composing of carbonate and sand or mudstone interlayer which is formed in littoral and shallow-marine environments,and which can provide ore-bearing strata and barrier bed for the mineralization;the complex structure movement in this area which is situated in thrusting nappe geological block and derived faults and fold structure is induced lots of magma intrusion which can provide ore-forming elements;the structure movement combined the magmatic hydrothermal activity which are provide the hot and source for lead-zinc mineralization in northeast Yunnan province.