| 吴圣刚,周雄,王文祥,郭锦龙,曾庆玉,杨世鹏.湘东北万古金矿床成矿流体特征及地质意义[J].矿产勘查,2026,17(7):1177-1189 |
| 湘东北万古金矿床成矿流体特征及地质意义 |
| Characteristics and geological significance of the ore-forming fluids of the Wangu gold deposit in northeastern Hunan Province |
| 投稿时间：2026-03-15 |
| DOI：10.20008/j.kckc.202607005 |
| 中文关键词: 流体包裹体 氢氧同位素 成矿流体特征 Au的沉淀机制与成矿过程 万古金矿床 |
| 英文关键词: fluid inclusions H-O isotopes characteristics of ore-forming fluids precipitation mechanism of Au and ore-forming process Wangu gold deposit |
| 基金项目:本文受湖南省自然资源科研项目“幕阜山地区金-稀有金属大规模成矿机理及其成因联系研究”(HBZ20240125)资助。 |
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| 中文摘要: |
| 万古金矿床是江南造山带中段重要的脉型金矿床，资源潜力巨大。本文结合流体包裹体岩相学、显微测温、激光拉曼光谱及石英 H-O同位素分析，系统揭示了万古金矿床成矿流体的来源、性质与演化过程，阐明了 Au的沉淀机制及成矿过程。流体包裹体研究表明，万古金矿床原生流体包裹体主要为气液两相水溶液包裹体(Type I)和 CO2三相水溶液包裹体(Type II)两类，成矿流体属 H2O-NaCl体系，含少量 CO2。从早成矿阶段至晚成矿阶段，均一温度依次为 255～339 ℃、212～286 ℃和 170～237 ℃，呈现逐渐降低趋势；盐度范围分别为 0.9%～9.4%、2.1%～8.3%和 2.0%～6.9% NaCl eqv，各阶段平均值接近(4.5%、4.8%、4.6%)显示盐度在成矿过程中总体保持相对稳定；密度由 0.7～0.8 g/cm3略增至 0.9 g/cm3。主成矿阶段成矿压61.2~189.1 MPa，对应成矿深度 2.3~7.1 km，属中—深成环境。H-O同位素组成表明，主成矿阶段流体以岩浆热液为主，晚阶段有大气降水混入。综合研究表明，流体混合作用与硫化作用是万古金矿力为， |
| 英文摘要: |
| The Wangu gold deposit is a significant lode-type gold deposit in the middle segment of the Jiang-nan Orogenic Belt, with substantial resource potential. This study integrates fluid inclusion petrography, microther-mometry, laser Raman spectroscopy, and quartz H-O isotope analyses to systematically reveal the source, nature,and evolution of the ore-forming fluids at the Wangu gold deposit, and to elucidate the gold precipitation mecha-nism and mineralization process. Fluid inclusion studies indicate that primary fluid inclusions in the Wangu gold de-posit are mainly of two types: aqueous two-phase inclusions (Type I) and CO2-bearing three-phase inclusions (Type II). The ore-forming fluids belong to the H2O-NaCl system, containing minor CO2. Homogenization temperatures de-crease progressively from the early to the late mineralization stage: 255-339 ℃ in the early stage, 212-286 ℃ in themain stage, and 170-237 ℃ in the late stage, marking a clear cooling trend. Salinity ranges for the three stages are0.9%-9.4%, 2.1%-8.3%, and 2.0%-6.9% NaCl eqv, respectively, with average values of 4.5%, 4.8%, and 4.6% — a striking similarity that suggests overall salinity remained relatively stable throughout ore formation. Meanwhile,fluid density increases only slightly, from 0.7-0.8 g/cm3 in the early stage to 0.9 g/cm3 in the late stage. The ore-forming pressure during the main mineralization stage was 61.2-189.1 MPa, corresponding to a mineralizationdepth of 2.3-7.1 km, indicating a meso-to hypogene environment. Hydrogen and oxygen isotopic compositions indi-cate that the fluids during the main mineralization stage were predominantly magmatic-hydrothermal, with meteoricwater involvement in the late stage. Comprehensive studies suggest that fluid mixing and sulfidation are the keymechanisms for gold precipitation in the Wangu gold deposit. |
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