The Dayan fluorite deposit in Wangmo County of southwestern Guizhou Province is located in the fractured zone between the Permian Wujiaping Formation limestone and the P/T interface structural alteration body.Through the analysis of fluorite fluid inclusion lithology and micro laser Raman spectroscopy composition,the properties,sources,and genesis mechanisms of independent fluorite ore fluids were explored,to enrich the research data on fluorite deposits in Wangmo County and provide reference for the next step of mineral exploration.Fluid inclusions mainly develop gas-liquid H2O inclusions(type Ⅱ)and a small amount of rich crystal inclusions.The homogenization temperature of fluorite fluid inclusions is 101～116℃,mainly concentrated in 130～150℃.The salinity is 0.17%to 1.45%NaCleqv,and the density is 0.84 to 0.96 g/cm3,belonging to low salinity and low density.The composition of the ore-forming fluid is relatively simple,with the solid phase consisting of calcite(CaCO3),the gas phase mainly consisting of H2O and weak CO2,and the liquid phase consisting of H2O,mainly the NaCl-H2O system.The fluorite in the Dayan deposit belongs to the same source of ore-forming fluids with gold and antimony deposits,and is a late-stage ore-forming product of this fluid.The ore-forming fluid containing F surged up along the Nanpanjiang deep fault and migrated through the P/T interface,which has undergone water rock reactions with the surrounding rock to extract calcium from the rock.During its migration to the surface,the ore-forming fluid cooled due to the addition of atmospheric precipitation,while the tectonic expansion and decompression caused ore-forming fluid to boil,resulting in fluorite precipitation.A low-temperature hydrothermal fluorite deposit of metasomatic filling type was formed in favorable mineralization areas such as fractured zones,joint fissures,and P/T interface voids between the Wujiaping Formation limestone layers.
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