| 延边闹枝铜金矿床的矿物流体包裹体特征与成矿作用研究 |
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| 引用本文：.2010.Characteristics of fluid inclusions and mineralization in Naozhi copper-gold deposit, Yanbian area [J].Mineral Deposits,29(2):243~252 |
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| 基金项目:国家自然科学基金（40472050； 40772052）、南京大学内生金属成矿机制国家重点实验室基金（2006-2005，2006-2008，2008-2010） |
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| 中文摘要:闹枝铜金矿床是延边内生金铜矿集区内的典型矿床之一，矿体主要为含金黄铜矿黄铁矿石英脉型。笔者运用显微测温、激光拉曼探针，对其矿物内的流体包裹体进行了系统研究。实验结果表明：① 流体包裹体的类型主要为气液两相包裹体，其次为纯气相、富气相包裹体及纯液相包裹体，还有少量含子晶的多相包裹体；② 流体包裹体的均一温度为150～410℃，与黄铁绢英岩、石英-黄铁矿、石英-多金属硫化物及石英方解石脉4个矿化蚀变阶段相对应的流体包裹体的均一温度分别为350～410℃、290～350℃、210～290℃、150～210℃；③ 流体包裹体的盐度w（NaCleq）为1.74%～20.97%，Ⅰ、Ⅱ、Ⅲ、Ⅳ矿化阶段成矿流体的盐度w（NaCleq）分别为2.396%～5.548％、2.24%～8.68％、1.74%～20.97％和6.3％；④ 流体包裹体的气体成分主要为H2O和CO2。结合前人的研究成果，笔者进一步确定该矿床的成矿流体具有深源岩浆热流体性质，在流体上升过程中曾发生过弱的沸腾作用，并在硫化物石英脉、多金属硫化物石英脉、方铅矿脉以及石英方解石脉形成过程中，伴有少量地下水或大气水的加入。 |
| 中文关键词:地球化学 流体包裹体 流体演化 成矿作用 闹枝铜金矿床 延边地区 |
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| Characteristics of fluid inclusions and mineralization in Naozhi copper-gold deposit, Yanbian area |
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| Abstract:The Naozhi Au-Cu deposit is a typical endogenic deposit in Yanbian and consists mainly of quartz vein-auriferous ore bodies. The fluid phases associated with auriferous quartz veins were investigated using microthermometry and Raman microprobe. Some conclusions have been reached through petrographic observation: ① there are mainly gas-liquid biphase (L+V) inclusions, subordinately pure volatile (V), volatile-rich (RV) and pure liquid inclusions (L), and minor daughter minerals-bearing polyphase inclusions (L+V+S); ② homogenization temperatures of fluid inclusions range from 150 ℃to 410℃, and the homogenization temperatures of four successive ore-forming stages characterized respectively by pyritization-sericitization-silification (stageⅠ), quartz-pyrite (stage Ⅱ), quartz-polymetallic sulfides (stage Ⅲ), and quartz-calcite (stage Ⅳ) are 350～410℃, 290～350℃, 210～290℃, and 150～210℃ respectively; ③ the salinities w(NaCleq) of these fluid inclusions vary between 1.74% to 20.97%, and the salinities w(NaCleq) of Ⅰ,Ⅱ, Ⅲ, Ⅳ ore-forming stages are 2.396%～5.548％, 2.24%～8.68％, 1.74%～20.97％ and 6.3％，respectively; ④ the volatiles are mainly composed of H2O and CO2. Combined with previous researches on Naozhi deposit fluid inclusions, the authors have further confirmed that the ore-forming fluids from the upper-mantle or lower-crust boiled slightly during their upward migration to the earth's surface, that sulfide quartz veins, polymetallic sulfides-rich quartz veins and galena veins were formed successively with the evolution of the ore fluids, with the participation of a bit of groundwater or meteoric water, and that the formation of quartz and calcite veins meant the end of the ore-forming process. |
| keywords:geochemistry, fluid inclusion, fluid evolution, mineralization, Naozhi copper-gold deposit, Yanbian area |
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