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中文摘要:利用热力学方法计算了两秦岭铀矿床含矿热液中铀的迁移形式。结果表明，从含矿热液早阶段到主成矿作用发生之前，热液中的铀主要以[UO₂(CO₃)⁰]形式迁移；在晚阶段残余热液中，铀的迁移形式改变为以[UO₂ (SO_{40]为主。铀迁移形式改变的原因与大气降水中SO₄^2-离子的大量带入有关，表明含矿热液来自深部而非大气降水。}

中文关键词:铀矿床含矿热液铀迁移形式热力学研究西秦岭

Abstract:This paper has analysed constituents of fluid inclusions in quartz and calcite formed at different stages of uranium-bearing hydrothermal solution in the West Qinling uranium field and, using thermodynamic method, calculated migration forms of uranium in uranium-bearing hydrothermal solution. The results show that at the early ore-forming stage, the uranium-bearing hydrothermal solution, mainly contains K⁺, Na⁺, Ca²⁺, Mg²⁺, Cl^-, CH₄, CO₃^2- and CO₂, and is deficient in SO₄^2-, and at the middle and late ore-forming stages, with the elevation of the emplacement of uranium-bearing hydrothermal solution and the variation of the environment, K⁺ and Cl^- tend to decrease, Na⁺ somewhat increases, and Ca²⁺, Mg²⁺, CH₄, CO₃^2-, CO₂ and SO42- obviously increase. The mixing of the groundwater with the uranium-bearing hydrothermal solution, as evidenced by the fact that the groundwater at the oxidation-reduction interface is of SO₄^2--HCO₃^--Ca²⁺ and Mg²⁺ types, and the water body is rich in Ca²⁺, Mg²⁺ and SO₄^2- ions. Thermodynamic calculation of uranium migration forms in uranium-bearing hydrothermal solution demonstrates that at the early and middle ore-forming stages uranium in the uranium-bearing hydrothermal solution migrates mainly in the form of [UO₂(CO₃)⁰], whereas in the residual hydrothermal solution of the late stage, the migration form of [UO₂ (SO_{40] becomes dominant. It is therefore inferred that the change of uranium migration forms might be attributed to the entry of large quantities of SO₄^2- ions derived from meteoric water, and that the uranium-bearing hydrothermal solution is derived from the depth instead of from meteoric water.}

keywords:uranium deposit, uranium-bearing hydrothermal solution, migration form of uranium, thermodynamic study, west Qinling

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基金项目:地质矿产部“八五”定向攻关项目（9301）

引用文本：

何明友.1997.西秦岭铀矿床铀迁移形式的热力学研究[J].矿床地质,16(2):181~188
.1997.Thermodynamic study of Uranium migration forms in the west Qinling Uranium field[J].Mineral Deposits16(2):181~188

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