Characteristics of Ore Forming Fluid in Sphalerite of Saojiwan Lead-Zinc Deposit in the Northwest of Guizhou Province,China
Characteristics of Ore Forming Fluid in Sphalerite of Saojiwan Lead-Zinc Deposit in the Northwest of Guizhou Province,China
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发表时间：
2013
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通讯作者：
Wang Die
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作者：
Wang Die
对黔西北扫箕湾铅锌存款矿床的地质构造和矿体产出特征进行了研究，在显微镜下进行了岩相学和矿石构造的研究，在红外显微镜下对闪锌矿中流体包裹体的类型、形态、盐度和均一化温度进行了研究和测试，发现闪锌矿中流体包裹体以富液包裹体为主，流体包裹体均一温度为115.4 ~ 169.9 ℃，平均温度为140 ℃，流体包裹体凝固点为-0.5 ~-13.7 ℃，流体包裹体的结晶温度为-0.5 ~-13.7 ℃。流体密度为0.92 ~ 1.06 g/cm ~ 3，压力为1×105 ×105 Pa，表明闪锌矿成矿流体具有低温低压特征，表明扫基湾铅锌存款成矿流体可能来自中盐度含金属流体，金属存款成矿机制可能是低盐度大气水与中盐度含金属流体混合所致。
We studied the geology structure and orebody output characters of Saojiwan lead-zinc deposit in the northwest of Guizhou Province,China.Petrography and ore structures under microscope were studied.The fluid inclusion types,shapes,salinities and homogenized temperatures in sphalerite were studied and tested under infrared microscope.Liquid-rich inclusions are dominant types of fluid inclusion in sphalerite,with low ratio of gas phase to fluid phase.Homogenized temperature of fluid inclusions in sphalerite ranges from 115.4 ℃ to 169.9 ℃,with the mean temperature of 140 ℃.Freezing point of fluid inclusions in saphalerite ranges from-0.5 ℃ to-13.7 ℃,with salinity ranging from 0.88% to 17.52% NaCl eqv.Density of the fluid is in the range from 0.92 g/cm3 to 1.06 g/cm3 and the pressure is from 1×105 Pa to 5×105 Pa.These features show that the ore-forming fluid of saphalerite is characrateristic of low temperature and low pressure,with mainly two type salinity of low and medium salinity.They imply that the ore forming fluid of Saojiwan lead-zinc deposit may come from medium salinity metal-bearing fluid,and the mechanism of metal deposit may be induced by the mixing of low salinity atmospheric water and metal-bearing medium salinity fluid.