小秦岭—熊耳山地区金矿成矿的临界超临界流体

The critical-supercritical hydrothermal fluid of gold mineralization in the Xiaoqinling to Xiong'er shan areas

临界 超临界流体对金属矿床 ,特别是对金矿成矿具有重要作用。对流体包裹体的特征研究表明 ,小秦岭—熊耳山地区石英脉型、构造蚀变岩型及爆破角砾岩型 3种主要类型金矿床的成矿流体属临界 超临界流体 ,随着成矿作用由深到浅 ,由高温、高压到低温、低压的演化 ,临界 超临界流体也逐步演化成中低温非超临界流体 ,从而使现有的测试结果表明 ,目前只有少部分为超临界包裹体 ,大部分为非超临界包裹体。

The critical-supercritical hydrothermal fluid has an important role during the ore-forming processes of metallic deposits. The study of characteristics of inclusions in hydrothermal fluid shows that the ore-forming hydrothermal fluid of the three main gold deposits types including quartz vein type,altered rock type and explosion breccia type in the Xiaoqinling to Xiong'er shan belong to critical-supercritical hydrothermal fluid. The critical-supercritical hydrothermal fluid evoluted gradually to non-supercritical fluid during the evolution process from high temperature and high pressure in deep place to low temperature and low pressure in shallow place. Therefore, only a few inclusions are tested to be surpercritical inclusions, most of them are non-supercritical fluid inclusions.