北山金窝子金矿床流体包裹体特征及成矿流体演化
Fluid inclusions characteristics and ore-forming evolution of Jinwozi gold deposit
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摘要: 金窝子金矿床为于甘肃北山中成矿带。包裹体测温研究表明，从成矿初期到主成矿阶段，石英捕获了H2O—NaCl，H2O-CO2-CH4-NaCl，或H2O-CO2-NaCl体系的流体。大脉型金矿成矿初期，热液成矿流体由高温中盐度H2O-NaCl-CO2-CH4四端元组份混溶的均一相热液流体；石英-黄铁矿和多金属硫化物阶段，石英捕获两成分和温度都不相同的热液组份：低盐度、富水溶液、较冷的热液和高盐度、富挥发份CO2、CH4和水蒸气、较热的热液。主成矿阶段石英捕获的两类型包裹体的完全均一温度相差近100℃，而且富挥发份流体盐度相对于贫挥发份流体盐度高，上述特征表明主成矿期3号脉大规模金成矿并非流体沸腾作用结果。网脉型金矿（210号脉）黄铁矿-石英成矿阶段、石英．黄铁矿和多金属硫化物成矿阶段石英捕获的地质流体的温度-成分特征无明显差异，均捕获了两种组份不同、成矿温度一 致的地质流体（高盐度富水溶液流体和富堤盐度CO2＋CH4流体），与许多金矿的流体不混溶金成矿机制矛盾。
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Key words:
- Jinwozi Gold Deposit /
- fluid inclusions /
- immiscibility
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