川滇黔地区汉源周店子铅锌矿甲烷流体包裹体的发现及意义

Discovery and Significance of Methane Fluid Inclusions in Zhoudianzi Lead-Zinc Deposit,Hanyuan,Sichuan,Yunnan and Guizhou

越来越多的研究认为川滇黔地区铅锌矿属密西西比河谷型铅锌矿,但是对矿床流体包裹体研究却较为薄弱。本文对川滇黔地区北段的周店子铅锌矿矿体围岩中流体包裹进行了岩相学、显微测温及激光拉曼成分测试研究。结果显示,矿体流体包裹体类型以富液的气液两相包裹体为主,其均一温度在127.6~223.9℃,盐度11.58%~14.36%,密度0.93~1.02 g/cm^(3),属低温中盐度的CH-HO体系,其特征与MVT型铅锌矿流体特征基本一致。激光拉曼测试发现了甲烷包裹体,证明有机质参与了成矿过程。

A growing number of research believe that the Pb-Zn deposits in the Sichuan-Yunnan-Guizhou region belong to the Mississippi Valley-type Pb-Zn deposit, but the study of fluid inclusions in the deposits is relatively weak. The sampling from the fluid inclusions in the surrounding rock of Hanyuan Xinhe Pb-Zn deposit in north of Sichuan-Yunnan-Guizhou province was studied through the petrography, microthermometry and the Laser Raman spectrometry. The results show that the homogenization temperatures are 127.6~223.9 ℃;salinities are 11.58%~14.36%;densities are 0.93~1.02 g/cm^(3).So it is CH-HO system with low homogenization temperature and middle salinities. It’s characteristics is similar with the Mississippi valley-type Pb-Zn deposits. The Laser Raman spectrometry found themethane fluid inclusions, this proved that the organic matter participates in the mineralization process.