黔西南灰家堡卡林型金矿田硫铅同位素组成及成矿物质来源研究  

Sulfur and Lead Isotopic Composition of the Huijiabao Carlin-type Gold Field and the Ore-Forming Material Sources in Southwest of Guizhou

作　　者：王泽鹏[1,2] 夏勇[1] 宋谢炎[1] 闫宝文[1,2] 谭亲平 

机构地区：[1]中国科学院地球化学研究所,矿床地球化学国家重点实验室,贵阳550002 [2]中国科学院大学,北京100049

出　　处：《矿物岩石地球化学通报》2013年第6期746-752,758,共8页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家科技支撑计划课题(2006BAB01A13);贵州省地质矿产勘查开发局地质科研项目[黔地矿科(2009)11号];矿床地球化学国家重点实验室自主研究基金资助项目

摘　　要：为探讨黔西南灰家堡金矿田中成矿物质来源，作者对其部分典型矿床中硫化物进行了系统的硫、铅同位素分析。结果显示，雄黄护‘s值为o．81％o～5．20‰，均值为1．96％。，两件辉锑矿8“s值分别为-o．47％o和-4．88％0。雄黄和辉锑矿扩“s值主要在0‰附近，硫同位素直方图显示明显的塔式效应，指示成矿流体中硫可能主要来源于深部。雄黄、黄铁矿铅同位素组成变化均较大，雄黄铅同位素组成的变化明显大于黄铁矿且更接近于区域地层及峨眉山玄武岩。矿石铅”值为9．33～9．61，主要小于9．58，推测为循环大气降水淋滤围岩地层岩石中高放射性成因的铅加入原始成矿流体，从而导致晚期雄黄显示出部分壳源铅特征。矿田内雄黄、黄铁矿的铅同位素可能为壳幔混合铅。To discuss the evolution of potential metal sources, sulfur and lead isotopic compositions of sulfides in typ- ical gold deposits from the Huijiabao Carlin-type gold field have been systematically analyzed. The results showed that the 334S values of Realgars range from 0.81%0 to 5.20%0 with a mean of 1.96%0, and the 334S values of two Stibnites are --0.47%0 and --4.88%0. The 334S values of Realgars and Stibnites present a tower distribution with most values near 0%0, indicating deep zone originations. Lead isotopic compositions of realgars and pyrites range widely, the variation of lead isotopic composition of realgars is higher than that of pyrites, and lead isotope compo- sitions of realgars are very close to those of the regional strata and the Emeishan basalts. The/~ values of the ores are from 9.33 to 9.61, with majorities are below 9.58. Lead in the late stage Realgar exhibits a crust-derived char- acteristics may be the result of radiogenic lead in wallrocks being leached into the primary ore-forming fluid by cir- culated meteoric water. The lead isotopes in the studied realgar and pyrite may indicate mixing of the crust and the mantle leads.

关 键 词：硫同位素 铅同位素 成矿物质来源 灰家堡金矿田 黔西南 

分 类 号：P618.51[天文地球—矿床学]