云南省革档金矿流体包裹体地球化学特征

对云南省富宁革档金矿含金石英脉的流体包裹体进行系统的研究表明,这些包裹体可分为富液包裹体、富气包裹体和气相包裹体三种类型。金成矿主要分为三期:成矿前期、主成矿期和成矿后期,其中主成矿期包裹体均一温度为210～260℃;成矿热液盐度主要范围为4.55%～6.38%,并且从成矿早期到晚期盐度呈逐渐降低趋势;流体密度较大,一般大于0.80g/cm3,流体的pH介于6.13～6.77。上述流体包裹体特征表明革档金矿的成矿介质为中低温、低盐度、弱酸性的还原性热液流体,革档金矿为浅成-中低温渗滤热液型金矿床。

Geochemistry Characteristic of Fluid Inclusion in Gedang Gold Deposit, Yunnan Province

Systematic analyses on fluid inclusion in auriferous quartz veinstones in Gedang gold deposit,Funing,Yunnan province have shown that,there are three types of inclusions:fluid-rich,gas-rich,and gas inclusions.Gold mineralization could be divided into three phases:pre-forming,the main ore-forming and late-forming stage.In the main ore-forming stage,the mean temperature of inclusions was about 210~260℃.The salinity of hydrotherm ranges 4.55% ~ 6.38%,and declines from early to the late stage of mineralization.The density of hydrotherm was larger than 0.80 g/cm3,ph values were about 6.13~6.77.These inclusions characteristic demonstrated that,mineralization medium of Gedang goldmine is the hydrothermal fluids with low temperature,low salinity,and weak acid reduction.So we concluded that the Gedang goldmine is the epithermal and low-temperature hydrothermal gold deposits.