云南会泽铅锌矿床分散元素的富集机制——兼论浅色闪锌矿富集Cd的原因  

Enrichment mechanism of the dispersed elements in the Huize lead-zinc deposit,Yunnan province-disccussion on reasons for Cd enrichment in sphalerite with light color

作　　者：张茂富[1] 周宗桂[1] 熊索菲[1] 宫勇军[1] 姚书振[1] 李行[1] 

机构地区：[1]中国地质大学(武汉)资源学院,武汉430074

出　　处：《地质找矿论丛》2016年第1期18-28,共11页Contributions to Geology and Mineral Resources Research

基　　金：中上扬子地块周缘成矿系统演化与铅锌多金属矿床时空分布规律研究(编号:12120113094200)计划项目<环扬子地块构造演化与铅锌多金属成矿地质背景研究>资助

摘　　要：文章对云南会泽铅锌矿床的黄铁矿、方铅矿和闪锌矿中的分散元素进行了电子探针分析(EMPA),探讨了分散元素的富集机制。结果表明,分散元素含量已达到综合利用指标,且富集规律为:分散元素以类质同象的形式赋存,黄铁矿中分散元素含量较低,而方铅矿中分散元素的含量稍高于闪锌矿。闪锌矿中:Cd富集顺序为红色>杂色>黑色,在高温阶段Cd置换Fe,低温阶段Cd置换Zn;Ga通过置换Zn进入闪锌矿,Ge可能主要替代Fe而进入闪锌矿晶格。方铅矿中:Cd和Ga元素置换Fe或Pb先进入方铅矿晶格内,Ge则富集较晚,具体表现为:当Ga含量较低时,元素进入方铅矿晶格顺序为Fe,Zn→Cd→Ga,Ge,当Ga含量较高时,元素进入方铅矿晶格的顺序依次为Cd,Ga→Ge。Based on electron microprobe analysis（EMPA）of dispersed elements in pyrite,galena and sphalerite in Huize Pb-Zn deposit,Yunnan province we discuss enrichment mechanism of the elements.The results show that the content of the elements has meet the requirement of comprehensive utilization,and the enrichment in pattern of isomorph and characterized by lower content in pyrite and that in galena slightly higher than in sphalerite.Different colors of sphalerite show different enrichment of Cd：redvariegatedblack.During high temperature Cd replaces Fe and Zn during low temperature Cd enters into the sphalerite lattice by replacing Zn,Ge by replacing Fe.Probably,Cd and Ga enter into galena lattice by replacing Fe or Pb first then Ge into the lattice.when Ga is low elements into galena lattice is in the order of Fe、Zn→Cd→Ga、Ge,when Ga higher in the order of Cd,Ga→Ge.

关 键 词：会泽铅锌矿床 分散元素 富集机制 硫化物 云南省 

分 类 号：P595[天文地球—地球化学] P618.4[天文地球—地质学]