云南个旧锡矿的玄武岩成矿  

Mineralizations in Basalts of the Gejiu Tin Deposit in Yunnan Province

作　　者：黎应书[1] 秦德先[1] 党玉涛 薛传东[1] 谈树成[3] 洪托[1] 

机构地区：[1]昆明理工大学矿产地质研究所,昆明650093 [2]云南锡业集团公司,云南个旧661000 [3]云南大学资源环境与地球科学学院,昆明650031

出　　处：《吉林大学学报（地球科学版）》2006年第3期326-335,共10页Journal of Jilin University：Earth Science Edition

基　　金：国家"十五"科技攻关项目(2004BA615A-03);云南省自然科学基金项目(2003D00008Q)

摘　　要：个旧锡矿产于个旧东区，是一个以锡铜为主的超大型多金属矿床，具有火山沉积成矿的某些特征。因遭受燕山期花岗岩的叠加改造，区内个旧组卡房段中玄武岩遭受强烈的变质，它又具有花岗岩热液成矿的特征。区内玄武岩的地质地球化学特征表明，印支期玄武岩中的Sn、Cu、Pb、Zn、Ag和Au的质量分数大多数高于世界玄武岩平均值的若干倍；矿石硫化物的硫同位素δ^34S为-1．5‰～4．0‰，平均＋0．207‰，在幔源硫附近；铅同位素模式年龄分为两组：第一组为180～240Ma，反映了印支期的火山沉积成矿作用；第二组为80～140Ma，反映了燕山期花岗岩的叠加改造成矿作用。区内印支期玄武岩为个旧锡铜多金属矿床的形成提供了主要的成矿物质，与成矿有直接联系。Located in eastern Gejiu area, the Gejiu tin ore deposit is a super-large polymetallic deposit dominated by tin and copper mineralization and featured by characteristics of the volcano-sedimentary ore deposits. Reworked by granites of the Yanshanian epoch, the basalts of the Gejiu Formation underwent intense metamorphism. The authors deal with the geological and geochemical features of the basalt and related mineralization in the area. The results of the research are. The contents of Sn, Cu, Pb, Zn, Ag and Au in the Indosinian basalt in the area are higher than those in average basalt of the world;The sulfur isotopes of sulfides in the deposits are between -1.5‰ and 4.0‰, similar to those of the mantle; Model ages of lead isotopes of the ores can be divided into two groups： The first group ranges from 180 Ma to 240 Ma, which represents basic volcano-sedimentary mineralization of the Indosinian epoch, while the second group ranges from 80 Ma to 140 Ma representing the superimposed mineralization of the Yanshanian granite. It＇s believed that the Indosinian basalt provided the ore-forming materials for the ore deposit and was directly related to the mineralization in the area.

关 键 词：印支期玄武岩成矿 燕山期花岗岩热液叠加-改造成矿 锡矿床 云南个旧 

分 类 号：P618.44[天文地球—矿床学]