贵州牛角塘镉锌矿床中发现原生硫镉矿  

DISCOVERY OF PRIMARY GREENOCKITE IN NATURE,AS EXEMPLIFIED BY THE NIUJIAOTANG CADMIUM-ZINC DEPOSIT,GUIZHOU

作　　者：刘铁庚[1] 张乾[1] 叶霖[1] 邵树勋[1] 

机构地区：[1]中国科学院地球化学研究所矿床地球化学开放研究实验室,贵州贵阳550002

出　　处：《矿物学报》2004年第2期191-196,共6页Acta Mineralogica Sinica

基　　金：国家自然科学基金(批准号:40172037;40373021);中国科学院矿床地球化学开放实验室基金

摘　　要：在贵州牛角塘镉锌矿床中既有次生硫镉矿的存在,也发现了原生硫镉矿。硫镉矿的产状如下:①呈包裹体形式产于硫化物中;②以不规则晶粒赋存于硫化物粒间:③形成硫镉矿 方铅矿细脉或硫镉矿微脉穿插硫化物;④分布在黄铁矿中方铅矿或闪锌矿周围;⑤被菱锌矿胶结并交代,形成硫镉矿残骸状角砾;⑥组成菱锌矿 硫镉矿疏松集合体或菱锌矿 硫镉矿细脉;⑦呈皮壳状或薄膜状分布在氧化矿石表面或裂隙面上。前五种形式产出的硫镉矿为原生硫镉矿,主要分布在原生矿石或弱氧化的矿石中。后两种产状的硫镉矿为次生硫镉矿,分布于氧化矿石晶洞中或矿石表面和裂隙面上。并从Cd、Zn地球化学特性、热力学和结晶化学性质探讨了原生硫镉矿形成机制。It is thought that greenockite is a seconday (supergenic) mineral, but there has been found primary greenockite in the Niujiaotang cadmium-zinc deposit in Guizhou.Its occurrence is described as follows: 1) as inclusions occurring in sulfide; 2) as irregular crystal gains occurring among sulphides; 3) as greenockite or greenockite-galena veinlets penetrating sulfides,or as smithsonite-greenockite veinlets penetrating dolomite;4) around sulphide; 5) as loose aggregates of smithsonite-greenockite; 6) as crusts of smithsonite-greenockite. Genetically, greenockites can be divided into three types: 1) occurring at the stage of precipitation and rock-formation; 2) by hydrothermal process; 3) occurring after outcropping on the surface due to weathering-leaching. But the mechanism of formation of primary greenockite is discussed in terms of thermodynamics and crystallography.

关 键 词：镉锌矿床 硫镉矿 产出形式 矿物共生组合 

分 类 号：P578.2[天文地球—矿物学]