云南元阳大坪改造型金矿床的成矿热液系统地球化学

GEOCHEMISTRY OF ORE-FORMING HYDROTHERMAL SYSTEM OF DAPING REWORKED GOLD DEPOSIT, YUANYANG, YUNNAN

本文探讨了哀牢山金矿带内元阳县大坪金矿床成矿热液系统的发生及其演化过程。认为该矿床成矿热液系统是在一定的物理化学和造山带构造条件下，岩浆热液和被加热的地下水混合成改造热液，改造了矿源岩──晋宁期闪长岩，被活化的成矿物质和岩浆热液携带的矿质在一定的物理化学场中迁移、沉淀富集成矿的。矿床属典型的改造热液型矿床。其成矿作用大致经历了早期矿源岩→晚期岩浆热液活动→改造热液使矿质活化迁移→改造富集成矿的过程。所以此矿床的成矿物质来源、水源和热源是多源的，成矿是多阶段的。

The process of generation and evolution of the ore-forming hydrothermaI system is dis-cussed for the Daping gold deposit , Yuanyang County. It is contained in the Ailaoshan gold metal-logenic belt of Yunnan Province. It is considered that magmatic hydrothermal solution and hot un-derground water mixed into a reworked hydrothermal solution which reformed the source rock-diorite of the Jinningian period in the definite physico-chemical and structural conditions in the oro-genic belt. The dispersed metallogenic material were remobilized and some of the ore-forming ma-terials coming from magmatic activity migrated to form the ore deposit in the definite geochemicalfield. The gold deposit is a typical deposit of the hydrothermal-reworked type. Therefore, themetal logenesis of the deposit involved the formation of source rock or source bed at the early stage→the mobilization and migration of ore-forming materials during magmatic activity at the latestage→the formation of the deposit. So the ore-forming materials, water and heat of the depositare of poly-source and the poly-stage.