滇黔桂地区微细浸染型金矿硫铅同位素地球化学研究  

Sulfur-Lead Isotope Geochemistry of Micro-disseminated Gold Deposits in Yunnan-Guizhou-Guangxi Area

作　　者：李毅[1,2] 徐文忻[2] 刘悟辉[1] 李蘅[2] 戴塔根[1] 

机构地区：[1]中南大学,湖南长沙410083 [2]桂林矿产地质研究院,广西桂林541004

出　　处：《地球学报》2005年第B09期168-170,共3页Acta Geoscientica Sinica

基　　金：本文为原有色金属工业总公司地质局科技攻关项目资助.

摘　　要：对滇、黔、桂微细浸染型金矿硫化物进行硫、铅同位素测定，获得马雄、浪全、金牙、高龙、堂上等矿床^206Pb/^204Pb比值为17．636-19．530；^207Pb／^204Pb比值为15．451～16．092；^208Pb／^204Pb比值为37．871～40．854。用等时线斜率与铅同位素曲线关系剖析，矿床形成年代晚于矿床赋存层位，铅来源较为复杂。金牙矿床硫化物的δ^34S值为-23％--1‰；高龙矿床硫化物的δ^34S值为-15．3‰～15．6‰；板其矿床硫化物的δ^34S值为-1．5‰～14．7‰；柴木函矿床硫化物的δ^34S值为0．2‰～18．0‰；戈塘矿床硫化物的δ^34S值为-29．2‰～5．0‰；丫他矿床硫化物的δ^34S值为5．5‰～8．0‰，获得矿床有单一岩浆来源，单一海水（地层）来源和混合来源3种类型矿床。The sulfide and lead minerals in the micro-disseminated gold deposits of Yunnan-Guizhou-Guangxi area were analyzed by sulfur and lead methods. It is shown that ^206Pb/^204Pb values vary from 17. 636 to 19. 530, ^207Pb/^204Pb from 15. 451 to 16. 092, and ^208Pb/^204Pb from 37. 871 to 40. 854 in such deposits as Maxiong, Langchuan, Jingya, Gaolong and Changshang. The gold deposits were formed later than their host sedimentary rocks. The origins of lead are complicated. The δ^34S values of sulfides in the Jingya deposit vary from - 23‰ to - 1‰, those in the Gaolong deposit vary from - 15.3‰ to 15.6‰, those in the Banqi deposit vary from - 1. 5‰ to 14.7‰, those in the Chaimohan deposit vary from 0.2‰ to 18.0‰, those in the Guochang deposit vary from - 29. 2‰ to 5.0‰, and those in the Yata deposit vary from 5.5‰ to 8.0‰. These data indicate that there exist three sulfur sources, i.e., magma, seawater and mixed magma and sulfate in seawater.

关 键 词：硫同位素 铅同位素 微细浸染型 金矿床 滇黔桂地区 微细浸染型金矿 硫化物 地球化学研究 ^208PB 同位素测定 

分 类 号：P618.51[天文地球—矿床学] X832.02[天文地球—地质学]