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The Lujing uranium deposit located in the southwestern part of the Nanling metallogenic belt is a representative granite-related hydrothermal uranium deposit in South China. In this paperit presents new detailed fluid inclusion and H-O isotope data to constrain the source, nature, and evolution of the ore-forming fluids and reveal the ore-forming mechanism. Four stages of mineralization have been identified in the Lujing deposit: (Ⅰ) macrocrystalline quartz+pyrite+chlorite+sericite, (Ⅱ) pitchblende+sulfide+chlorite+sericite+microcrystalline quartz, (Ⅲ) purple-black fluorite+reddish calcite+microcrystalline quartz+hematite+coffinite+pyrite, and (Ⅳ) comb quartz+light-green fluorite+white calcite. The stages Ⅱ and Ⅲ represent the main uranium mineralization. The early and main stages of mineralization contain aqueous inclusions and a small amount of CO2-bearing inclusions, whereas the late stage of mineralization contains only aqueous inclusions. The fluid inclusions in early-stage quartz have homogenization temperature of 186-317 ℃ and salinities of 9.9-12.9 wt% NaCleqv. The fluid inclusions in the quartz, fluorite, and calcite forming the main stage have homogenization temperatures of 169-236 ℃ and salinities of 6.3-9.9 wt% NaCleqv. The fluid inclusions in late-stage quartz, fluorite, and calcite have homogenization temperatures of 149-189 ℃ and salinities of 4.5-7.0 wt% NaCleqv. The ore-forming fluid system evolved from a CO2-H2O-NaCl system in the early stage to a NaCl-H2O system in the late stage. Fluid boiling was the dominant mechanism for uranium precipitation. The H-O isotope results indicate that the initial ore-forming fluid is the mixture of magmatic water and meteoric water, and the meteoric water was continuously added to the ore-forming fluids during mineralization.
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