【摘要】 通过云南者桑金矿床中流体包裹体岩相学、显微测温、稀土元素、氢氧同位素的分析,探讨了成矿流体特征。研究表明:存在液体包裹体、纯液体包裹体、纯气体包裹体和含液体CO2包裹体4种流体包裹体类型;液体包裹体均一温度为83.4~248.2℃,盐度为0.18%~6.45%,密度为0.85~1.0 g/cm3,成矿压力为10.9~59.4 MPa,成矿深度为0.2~2.2 km;各成矿阶段石英及方解石稀土元素特征表明,其成矿物理化学条件为还原环境。δ18OH2O值为-6.1‰~4.9‰;δDV-SMOW值为-40.3‰~-74.8‰,表明成矿流体来源为大气降水,岩矿石有机碳含量达到0.12%~0.45%,金品位与有机质含量呈正相关,黄铁矿及毒砂δ34SV-CDT值为9.2‰~10.2‰,表明者桑金矿床成矿热液中硫化物沉淀所需硫源为围岩中有机质与硫酸盐反应提供的还原硫。成矿热液在下渗过程中混合建造水,受到岩浆烘烤作用及地温梯度影响后再向上循环,金矿化发生在成矿流体的热循环与赋矿围岩的相互作用过程中,并在构造有利部位沉淀富集。更多还原

【Abstract】 Based on the petrography,micro-thermometry,REEs data,hydrogen and oxygen isotopes of the fluid inclusions in the Zhesang gold deposit in Yunnan Province,we discussed the characteristics of the ore-forming fluids.The results show that there are four types of fluid inclusions,which includes liquid inclusions,pure liquid inclusions,pure vapor inclusions and CO2-bearing three-phase inclusions.Homogenization temperatures,salinities,densities and mineralization pressures of liquid inclusions are 83.4-248.2 ℃,0.18%-6.45%,0.85-1.0 g /cm3 and 10.9-59.4 MPa,respectively.Metallogenic depth which is calculated based on the above data ranges among 0.2-2.2 km.REEs data of quartz and calcite from different hydrothermal stages display that the Zhesang gold deposit formed in reducing environment.δ18OH2Oof the fluid inclusions ranges from-6.1‰ to 4.9‰ and the δDV-SMOWranges from-40.3‰ to-74.8‰,showing that the ore-forming fluid comes from atmosphere precipitation.When the ore-forming fluid flowed through the organic-rich sedimentary rocks,primitive mefeoric water would be contaminated by the organic substance,resulting in the drift of hydro-gen isotope.Organic carbon content of the ores reaches 0.12%-0.45% and the Au grade is growing with the increase of organic carbon.The δ34SV-CDTvalues of pyrite and arsenopyrite range from 9.2‰ to 10.2‰.All these evidences proved the source of sulfur resulting from the reaction between organic matter and sulfate in wall-rocks.Preliminary analyses inferred that during the oozing process,the ore-forming fluid mixed with the construction water and was heated to recycle upward by magma and geothermal gradient.Gold mineralization occurred in interaction process between the thermal recycle and wall-rocks,and enriched in proper space.更多还原