摘要:哈西金矿位于新疆西准噶尔哈图—萨尔托海金成矿带的西延部分，是该成矿带内一个具有较大成矿潜力的金矿。为确定该金矿成矿流体的来源，本文对成矿阶段含明金石英脉中的流体包裹体及其氢氧同位素进行了研究，结果显示该成矿阶段石英中的包裹体数量众多，以气液两相包裹体为主，其次为富CO2三相包裹体，少量纯液相包裹体；成矿流体温度范围为226 ℃～325 ℃，盐度范围为2.24%～9.34%，密度范围为0.72～0.88 g/cm3；群体包裹体色谱分析显示，成矿流体液相成分富含Ca2+、SO42-、Cl-等离子，成矿流体气相成分主要为CO2，还有少量CH4、N2等气体。综合分析，哈西金矿成矿阶段的流体为一套中温、低盐度、低密度、受到了古大气水混入的岩浆后期热液，成矿后又伴随着多期次的热液叠加成矿。
关键词: 包裹体/
成矿流体/
地球化学/
哈西金矿/
新疆
Abstract:Haxi gold deposit is located in the western extension of the gold metallogenic belt of hatu-sartohai in western Junggar, Xinjiang, and it is a gold deposit with great metallogenic potential. In order to determine the source of ore-forming fluid, we discuss the fluid inclusions and hydrogen-oxygen isotope in the quartz vein containing native gold in the mineralization stage. The results show that there are many inclusions, the main is gas-liquid two-phase, followed by CO2-rich three-phase, and a little is pure-liquid. The homogenization temperature range from 226 ℃ to 325 ℃, salinities of fluid inclusions contents of NaCl range from 2.24% to 9.34%, densities range from 0.72 g/cm3 to 0.88 g/cm3. The population inclusion chromatography showed that the liquid composition of ore-forming fluid is rich in Ca2+, SO42-, Cl-, the gas phase composition is rich in CO2, and a little is CH4, N2. Comprehensively, the ore-forming fluid is late magmatic hydrothermal fluid, which characterized by medium temperature, low salinity, low density and mixed with atmospheric water. After mineralization, it is accompanied by multiple times of hydrothermal superposition mineralization.
Key words:Inclusion/
Ore-forming fluid/
Geochemistry/
Haxi gold deposit/
Xinjiang
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