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选取黔西北筲箕湾铅锌矿床作为研究对像,勘测其地质构造和矿体产出等特征,在显微镜下观察其矿石组构特征。利用红外显微镜对闪锌矿中的包裹体的类型、形态、盐度、均一温度进行了测量。分析结果表明,闪锌矿中的原生流体包裹体主要是富液相包裹体,气液比小,测得的均一温度范围为115.4～169.9℃,平均温度为140℃;冰点-0.5～-13.7℃,盐度0.88%～17.52%(eq.NaCl wt%),密度为0.92～1.06 g/cm3,流体的压力为1×105～5×105Pa。筲箕湾铅锌矿床成矿流体为浅成低温流体,盐度主要有低盐度流体和中等盐度两个端元,成矿机制可能是低盐度大气降水与携带矿质的中高盐度流体混和使铅锌产生沉淀形成。
The Shau Keiwan Pb-Zn deposit in the northwestern Guizhou Province was selected as the research object to survey its geological structure and ore body output characteristics and to observe its ore structure characteristics under a microscope. The type, morphology, salinity and homogenization temperature of inclusions in sphalerite were measured by infrared microscopy. The analysis results show that the primary fluid inclusions in sphalerite are mainly fluid-rich inclusions, and the gas-liquid ratio is small. The average temperature ranged from 115.4 to 169.9 ℃ and the average temperature was 140 ℃. The freezing point ranged from -0.5 to -13.7 ℃, salinity of 0.88% ~ 17.52% (eq.NaCl wt%), density of 0.92 ~ 1.06 g / cm3, the pressure of the fluid is 1 × 105 ~ 5 × 105Pa. The ore-forming fluid of Shau-Keiwan Pb-Zn deposit is a shallow-low-temperature fluid. The salinity is mainly composed of low-salinity fluid and medium-salinity end-units. The mineralization mechanism may be the combination of low salinity precipitation with medium- and high-salinity fluids carrying minerals Lead and zinc precipitate.