贵州猪拱塘铅锌矿床铅锌元素赋存状态研究

Occurrence of Pb and Zn elements in the Zhugongtang lead-zinc deposit,Guizhou

通过运用化学分析、扫描电镜及电子探针等方法,对贵州猪拱塘铅锌矿床的铅锌矿石进行了综合分析,研究表明:矿石为硫化矿,矿物成分简单,主要矿物为方解石、黄铁矿、方铅矿、闪锌矿及少量白云石,主要有用元素为Pb、Zn及S;矿石结构有自形-半自形晶粒状结构、他形晶粒状结构、交代结构等;构造类型为块状构造、浸染状构造及条带状构造等;方铅矿晶体粒径中等,闪锌矿粒径粒度比方铅矿稍大;大多数方铅矿、闪锌矿与黄铁矿连生,少数分布于黄铁矿的间隙内及浸染在方解石中,存在方铅矿交代残余闪锌矿与黄铁矿交代闪锌矿的现象;有用元素铅锌分别赋存于方铅矿及闪锌矿中。

This work comprehensively analyzed the lead and zinc ores in the Zhugongtang lead-zinc deposit of Guizhou Province through chemical analysis,scanning electron microscopy and electron probe. The results show that the ores are sulfide ores and have simple mineral composition. The ores are dominated by calcite,pyrite,galena,sphalerite and a small amount of dolomite,and the main useful elements are Pb,Zn and S. The ore textures include euhedral-subhedral,anhedral granular and metasomatic textures. The ore structures are mainly massive,disseminated and banded structures. Sphalerite has a slightly larger granularity than galena. Most galena and sphalerite occur in succession with pyrite,with few distributed in pyrite intergranular space and disseminated in calcite. Galena metasomatized residual sphalerite and pyrite metasomatized galena and sphalerite. The useful elements lead and zinc occur in galena and sphalerite,respectively.