黔东天柱磨山—油麻坳金矿流体包裹体地球化学研究

磨山—油麻坳金矿矿脉中石英的流体包裹体以单相液态和两相气液包裹体为主。含CO2 包裹体占5%±。成矿流体均一温度 1 70～ 2 3 0℃ ,盐度为 3 .1 %～ 1 0 .1 % ,密度为 0 .850～ 0 .958g/cm3 ,为中低盐度、较低密度的弱酸—弱碱性溶液。包裹体气相成分主要为H2 O、CO2 及CH4 ,液相成分中Na+ 、Ca2 + 及Cl-含量较高 ,相对贫K+ 、F-。成矿流体属Na Ca Cl型 ,为大气降水与变质水混合形成。

GEOCHEMISTRY OF FLUID INCLUSIONS FROM THE MOSHAN-YOUMA'AO GOLD DEPOSIT, TIANZHU, EASTERN GUIZHOU

Fluid inclusions in quartz from the Moshan-Youma'ao gold ore veins are dominated by liquid phase and gas-liquid phase. CO2-bearing fluid inclusions account for 50%±. The homogenization temperatures vary between 170℃ to 230℃, the salinities range from 3.1% to 10.1%, and the densities from 0.850 g/cm3 to 0.958 g/cm3, indicating that the fluid inclusions were derived from weakly acidic to weakly alkaline solutions characterized by medium-low salinity and low density. The gas phase is composed mainly of H2O, CO2 and CH4 while the liquid phase is chemically high in Na+, Ca2+ and Cl- but low in K+ and F-. The ore fluid belongs to the Na-Ca-Cl type, resulting from mixing of meteoric water and metamorphic water.