【摘要】 松江河金矿床位于夹皮沟—海沟金成矿带的中部,矿体主要产于新太古界色洛河岩群中部岩性段的底部,其热液成矿作用可划分为石英-黄铁矿、多金属硫化物-石英、石英-碳酸盐3个阶段。流体包裹体岩相学研究表明,多金属硫化物-石英阶段主要发育气液二相包裹体、含CO₂三相包裹体及少量纯CO₂包裹体。测温结果显示,成矿流体具有低盐度（1. 38%～6. 81%Na Cleqv）、低密度（0. 41～0. 86 g/cm³）的特点,成矿温度集中于260℃～390℃,成矿压力为70～106 MPa,成矿深度为6. 8～8. 7 km。成矿过程中,流体经过了H₂O-CO₂-NaCl体系的不混溶,导致金在成矿流体中的溶解度降低,发生沉淀作用并富集形成金矿床。更多还原

【Abstract】 The Songjianghe Gold Deposit is located in the central region of Jiapigou-Haigou Gold Belt. The ore bodies mainly occur in the bottom of the middle lithologic part of Seluohe Group of the Neoproterozoic. The hydrothermal mineralization can be classified into three stages: quartz-pyrite,polysulfide-quartz and quartz-marble. The petrographic study of the fluid inclusions shows that there are three types of fluid inclusions that develop in polysulfide-quartz stage including gas-aqueous two-phase inclusions,CO₂-bearing three-phase inclusions and a small amount of pure CO₂ inclusions. The micro-thermometric research reveals that the ore-forming fluids show the features of low salinity（ 1. 38 %-6. 81 % NaCleqv） and low density（ 0. 41 ～ 0. 86 g/cm³）. Mineralization temperature is concentrated in the range from 260 ℃ to 390 ℃,and the pressure ranges from 70 MPa to 106 MPa,the mineralization depth ranges from 6. 8 km to 8. 7 km. During mineralization,fluid immiscibility occurred in H₂O-CO₂-NaCl system in the oreforming process,leading to lower gold solubility in ore-forming fluids,precipitation and enrichment to gold deposit.更多还原