摘要:
湘西地区矿产资源丰富,是湘西-鄂西多金属成矿带的重要组成部分.湖南花垣铅锌矿田位于上扬子地台东南缘,为国家级铅锌矿整装勘查区.本文利用常规显微镜观察和电子探针分析手段,对湖南花垣铅锌矿田李梅矿区矿床矿石结构构造特征及矿物的分散元素镉锗镓进行了分析研究,认为矿床以富集镉为特征,锗和镓的富集程度较低.镉主要富集于闪锌矿中,锗和镓主要富集于方铅矿中.在原生硫化物闪锌矿、方铅矿和黄铁矿中,分散元素镉、锗、镓主要以类质同象形式存在,未发现其独立矿物.分散元素富集特征与MVT 型矿床类似.花垣矿床中镉高度富集,是研究分散元素镉的地球化学特征的理想地区.
Abstract:
The mineral resources are rich in western Hunan,which is an important part of the metallogenic belt of western Hunan and western Hubei.Hunan hua yuan lead-zinc ore field is located in the south edge of the upper Yangtze plate,and is the national lead-zinc deposit exploration area.Based on the observation of the common mi-croscope and the means of electron microprobe analysis,the authors analyze the dispersed elements of cadmium and germanium and gallium in the ore and minerals and the structure characteristics of ore structure from the Huayan ore fields in Limei Pb-Zn deposit of west of Hunan,it is considered that the deposit is characterized by enrichment of cadmium,with a lower degree of enrichment of germanium and gallium.Cadmium is mainly con-centrated in sphalerite,and germanium and gallium are mainly concentrated in galena. In the primary sulphide sphalerite,galena and pyrite,the occurrence status of the dispersed elements cadmium,germanium and gallium in the Pb-Zn deposit exist as isomorphism,and no independent minerals have been found.The enrichment charac-teristics of dispersed elements are similar to MVT deposits.Ore deposit with height of cadmium enrichment,which is the ideal region in study of dispersed element cadmium geochemical characheristics.
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