四川大梁子铅锌矿床分散元素镉、锗、镓的富集规律

分散元素在地壳中的含量很低,很难形成独立矿物和独立矿床,因此对矿床中伴生的分散元素的研究有重要的理论和现实意义。本文利用常规显微镜、电子探针和等离子质谱分析等手段,对大梁子铅锌矿床中的分散元素镉、锗、镓进行了研究。镉在闪锌矿中的含量随着闪锌矿颜色的变浅逐渐增加,镓则相反。分散元素镉、锗、镓的赋存状态为类质同象形式;矿床主要以富集镉为特征,其中镉主要富集于闪锌矿中,锗和镓主要富集于方铅矿中。

Enrichment of the dispersed elements Cd,Ge and Ga in the Daliangzi lead-zinc deposit,Huidong,Sichuan

Due to the contents of dispersed elements are very low in the Earth＇s crust, they are difficult to form independent minerals and ore deposits. Therefore, it is of theoretical and practical significance to study the dispersed elements associated in ore deposits. The present paper focuses on the dispersed elements Cd, Ge and Ga in the ores and minerals from the Daliangzi lead-zinc deposit, Huidong, Sichuan on the basis of microscope, elec- tron microprobe and ICP-MS examination. Three colours are observed in the sphalerite from the ore deposits： black, brown and beige. The Cd contents increase with the lightening of the colours, while things are opposite for Ga. The dispersed elements Cd, Ge and Ga tend to occur in the form of isomorphs. The Daliangzi lead-zinc deposit is characterized by the enrichment of Cd in sphalerite and Ge and Ga in galena.