【摘要】 新疆中天山地区热水沉积形成的马鞍桥铅锌矿床在成矿后期形成了穿插早期层状、似层状矿体的脉状紫色萤石-闪锌矿矿石。紫色萤石和闪锌矿中气液相L--V型流体包裹体的均一温度呈双峰式分布,主要分布在140℃~260℃和260℃~442℃两个区间内,且有少量高于470℃的流体包裹体存在,指示其成矿流体由中高温和低温两个端员组成。同时,测得脉状矿石的成矿流体盐度为1.91~6.30W t%(NaC l)和11.93~21.82 W t%(NaC l)。激光Raman光谱分析显示紫色萤石中气液相L--V型流体包裹体的气相组分主要为CH4、C2H6和C3H8等低分子烷烃及少量的H2S和N2,指示形成这种脉状矿石的热液由中高温的岩浆气液与低温、高盐度的油田热卤水混合而成。更多还原

【Abstract】 The hydrothermal sedimented Maanqiao Pb——Zn deposits in middle Tianshan of Xinjiang formed purple fluorite-sphalerite veins which cut through the earlier bedded ore bodies in late metallogenic stage.The homogeneous temperature of the vapor-liquid L-V type fluid inclusions in purple fluorite and sphalerite shows the characters of bimodal distribution and mainly distribute in 140~260℃ and 260~442℃,and some inclusions’ temperatures are higher than 470℃,which indicates the metallogenic fluids composed of two temperature ends including medium-high and low temperatures.The salinity of these vein ore metallogenic fluids is fall into two groups of 1.91~6.30Wt%(NaCl) and 11.93~21.82Wt%(NaCl).The study of laser Raman spectra reveals the main compositions of the gaseous phases in vapor-liquid L——V type of purple fluorite are some low molecular alkanes(CH4,C2H6,C3H8),as well as little H2S and N2.The fact shows the hydrothermal fluids forming the vein type ores are the mixed by the medium-high temperature magmatic vapor-liquid and the oilfield hot brine with low temperature and high salinity.更多还原