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对花山铀矿床内与成矿关系密切的各成矿阶段石英进行流体包裹体研究,结果显示,整个成矿作用中主要成矿流体为中-低温、中-低盐度及中等密度热液。从成矿早阶段至晚阶段,成矿流体的演化具有盐度和均一温度不断降低的趋势。C、H、O同位素分析结果表明,流体具有大气降水与深源流体的混合成因。∑CO2来源于幔源脱气作用,对铀的活化迁移起着重要作用,流体混溶导致∑CO2溢出是铀沉淀成矿的主要机制。
The fluid inclusions of quartz in each metallogenetic stage closely related to metallogenesis in Huashan uranium deposit were studied. The results show that the main ore-forming fluids are medium-low temperature, medium-low salinity and medium-density hydrothermal fluids. From the early stage to the late stage of metallogenesis, the evolution of ore-forming fluids tends to decrease salinity and uniform temperature. C, H, O isotope analysis results show that the fluid has a mixed cause of precipitation and deep source fluid. ΣCO2 originates from mantle source degassing and plays an important role in the activation and migration of uranium. ΣCO2 overflow caused by fluid miscibility is the main mechanism of uranium precipitation and mineralization.