陕西石泉将军河地区石英脉期次及包裹体地球化学研究

陕西石泉北部将军河地区石英脉发育, 具有多期特征。目前, 发现了大石板沟、叶家坡、青泥涧等多处金矿化点, 金矿化与石英脉关系较密切。划分石英脉的形成期次, 对比研究各期石英脉包裹体地球化学特征, 对工作区找金矿具有重要指导意义。研究显示将军河地区第一期石英脉(顺S1面理产出)包裹体为中低温(170~220℃)和较高盐度;第二期石英脉(顺S2面理产出)包裹体为中高温(270~370℃)和较高盐度;第三期石英脉(顺S3面理产出)包裹体为中低温(170~220℃)和较低盐度;区域上金矿分布主要与第二期石英脉展布方向一致, 长沟、羊坪湾金矿床中含金石英脉包裹体为中低温和较低盐度。通过采样分析, 发现将军河地区第二期石英脉形成温度和盐度较高,金矿化较贫, 今后找金矿应该重视中低温和较低盐度的石英脉包裹体地段。

Period and Fluid Inclusions Geochemistry of Quartz Veins in Jiangjunhe Area, Shiquan County,Shaanxi Province

Dashibangou, Yejiapo and Qingnijian gold mineralization points were discovered in Jiangjunhe area of Shiquan County in Shaanxi Province.Multi-stage quartz veins may relate to the gold mineralization. To discriminate the periods of quartz veins and geochemical characteristics of their inclusions has important significance for future prospecting in the study area. The research results show that the first-period quartz veins(occurrence parallel to S1 foliation) host fluid inclusions characterized by mesothermal-low temperature(170 to 220℃) and fairly high salinity; the second period quartz veins(occurrence parallel to S2 foliation) host fluid inclusions characterized by mesothermal-high temperature (270 to 370℃) and higher salinity; the third period quartz veins(occurrence parallel to S3 foliation) host fluid inclusions characterized by mesothermal-low temperature (170 to 220℃) and lower salinity.The regional gold deposits mainly distribute along the second period quartz veins, and the quartz veins of Changgou and Yangpingwan gold deposits have mesothermal-low temperature and lower salinity fluid inclusions. However, the second period quartz veins in Jiangjunhe district are characterized by mesothermal-high temperature and higher salinity and poor gold grade. So, more attention should be paid to the area with mesothermal-low temperature and lower salinity quartz veins in future prospecting.