青海省东莫扎抓铅锌矿床成矿期和成矿阶段分析

通过对青海省东莫扎抓铅锌矿床的黄铁矿δ34S与方铅矿的δ34S值、矿物生成顺序及C、O同位素特征进行研究,结果表明:东莫扎抓铅锌矿床可分为海底热液喷流沉积期、热液期、火山热液叠加改造期及表生期等4个成矿期;铅锌矿成矿阶段可分为5个阶段,分别为白云石化阶段、重晶石化阶段、多金属硫化物阶段、方解石化阶段及粘土化阶段;成矿流体中的碳主要来自围岩,从成矿早期到成矿后期大气降水的参与逐步增多。在多期区域构造作用的背景下,东莫扎抓呈现多期次多阶段叠加成矿的特点。

Study of mineralization epochs and mineral sequence of Dongmozhazhua Lead-zinc deposits,Qinghai province

The δ34S value,the order of generation and isotope characteristics of C and O of pyrite and galena in Dongmozhazhua Lead- Zinc deposits were analyzed.. The mineral epochs of Mozhazhua Lead- Zinc deposits can be divided into four periods： marine volcanic emanation- sedimentation period,volcanical hydrothermal period,magma hydrothermal metallogeny period and supergene period; Lead- Zinc mineralization stages can be divided into five stages： dolomitization stage,heavy crystal petrochemical stage,polymetallic sulfide stage,calcite stage and clay stage.carbon mainly came from the surrounding rock,the participation of precipitation gradually increasing. Dongmozhazhua Lead- Zinc deposits present multi- period and multi- stages superimposed mineralization characteristics.