贵州纳雍水东铅锌矿床石英包裹体特征及成矿温度研究

利用显微测温学的方法,对纳雍水东铅锌矿床中石英进行显微及包裹体测温研究。研究表明,石英的流体包裹体主要以气液相包裹体居多,纯液相次之。包裹体测温结果显示,成矿流体冰点温度为-12.5℃~0.1℃,均一温度变化范围为122.1℃~307.0℃,峰值范围为120℃~150℃,反映出中低温成矿的特征;流体盐度W(NaC leq)%变化范围为0.18%~16.43%,平均盐度7.05%;流体密度为0.8 g/cm3~1.02g/cm3,平均密度0.95 g/cm3;成矿压力为87.86×105Pa~351.94×105Pa,其对应的成矿深度为0.29 km~1.17 km之间,平均成矿深度为0.50 km。综合研究表明本区矿床为典型的中低温热液铅锌矿床,成矿流体呈现中低温、低盐度、中等密度、低压、浅成相的矿床成矿环境特征。

Study of Quartz Inclusion Character and Mining Temperature of Shuidong Lead-zinc Deposit in Nayong, Guizhou

By micro temperature measurement,it did the micro and inclusion temperature measurement to the quartz of Shuidong lead-zinc deposit in Nayong.According to the research,the fluid inclusion of quartz mainly is gas and liquid phases,others are purity liquid phase.The results shows that freezing temperature of mining liquid is-12.5℃ to 0.1℃,the homogenization temperature change range is 122.1℃ to 307.0℃,the peak range is 120℃ to 150℃,reflects the character of middle and low mineralization.The change range of the liquid salinity W（NaCleq） % is 0.18% to16.43%,the average salinity is 7.05%,the liquid density is 0.8 g/cm3 to 1.02 g/cm3,the average density is 0.95 g/cm3,the mining pressure is 87.86×105 Pa to 351.94×105 Pa,the corresponding mining depth is 0.29 km to 1.17 km,the average depth is 0.50 km.the comprehensible study shows that the deposit in this area is the typical middle-low temperature liquid lead-zinc deposit,the mining liquid shows the metallogenic environment characters of middle low temperature,low salinity,middle density,low pressure and low phases.