摘要
扬子地块西南缘分布着大量富含Cd、Ge与Ga的铅锌矿床,已成为我国Pb、Zn及Cd、Ge与Ga矿产资源的重要生产基地。对代表性铅锌矿床进行野外地质调查和系统采样鉴定后,应用电子探针微区分析手段,研究主要矿石矿物闪锌矿、方铅矿和黄铁矿中分散元素的富集特征。结果显示,各类矿床中闪锌矿均相对富集Cd,方铅矿富集Ge与Ga,而黄铁矿中Cd、Ge与Ga的富集系数均相对较低,未呈现出选择性富集的趋势;赋存于震旦纪—寒武纪地层且以脉状、网脉状产出的矿体中闪锌矿的Cd含量明显高于赋存于晚古生代并以层状产出的矿体中闪锌矿的Cd含量。
Many lead-zinc deposits in the SW margin of the Yangtze platform are characterized by the enrichment in dispersed elements,such as cadmium, germanium,and gallium.Enrichment characteristics of these dispersed elements in sphalerite, galena, and pyrite were delineated by electron microprobe analysis.Sphalerite has a high content of cadmium,while galena is characterized by enrichment in germanium and gallium. Pyrite contains cadmium, germanium and gallium on a lower level,with no selection for the elements. Cadmium contents in the sphalerite of the orebodies hosted in the Sinian and Cambrian strata and occurring as veins and stockworks are usually higher than those hosted in the late Mesozoic strata and occurring as layers or layer-like forms.
出处
《矿物岩石地球化学通报》
CAS
CSCD
2004年第2期105-108,共4页
Bulletin of Mineralogy, Petrology and Geochemistry
基金
国家自然科学基金(49872038)
中国科学院百人计划基金资助项目
关键词
铅锌矿床
分散元素
富集规律
扬子地块
lead-zinc deposits
dispersed element
enrichment regularity
Yangtze platform
