赣南淘锡坑钨矿床流体包裹体地球化学研究

Fluid inclusion geochemistry of the Taoxikeng tungsten deposit in southern Jiangxi Province,China

赣南崇义县淘锡坑钨矿位于南岭东西向构造带东段与武夷山北东一北北东向构造带南段的复合部位，属于以石英脉型黑钨矿为主的钨多金属矿床。对该矿床主成矿期与黑钨矿共生的石英和黑钨矿的流体包裹体进行了系统研究，结果显示，与黑钨矿共生石英中流体包裹体均一温度主要集中在160-260℃之间，盐度为164％-667％：黑钨矿中流体包裹体的均一温度主要集中在240～320℃之间，盐度为6.45％-10.49％。成矿流体性质主要为NaCI＋H20热液体系，含很少量的CO2,黑钨矿形成的温度和盐度较石英的高，推断黑钨矿形成较早，主要来源于花岗岩的结晶分异，石英形成晚于黑钨矿，且形成时流体中有大气降水加入。

The Taoxikeng tungsten deposit located in Chongyi County, southern Jiangxi Province, is situated between the eastern segment of the E-W-trending Nanling tectonic zone and the southern segment of the NE-NNE Wuyishan tectonic belt. It is a quartz vein-type tungsten polymetallic deposit. In this paper, we carried out systemic measurements of homogeneous, freezing temperatures and salinities of fluid inclusions in wolframite and coexisting quartz of the main mineralizing stage. The results show that the homogeneous temperatures of fluid inclusions in quartz of ores are mainly from 160℃ to 260℃, and the salinities are 1.64%-6.67%; whereas the homogeneous temperatures of fluid inclusions in wolframite are mainly from 240℃ to 320℃, and the salinities are 6.45% -10.49%. The ore-forming fluids have the main composition of NaCl ＋ H2O hydrothermal system, with minor or without CO2. The homogenization temperatures of fluid inclusions in wolframite are higher than those in quartz, implying that the wolframite formed earlier than quartz and originated mainly from crystallization differentiation of granite, whereas the quartz formed in the later stage of the ore-forming fluids in the main mineralization stage, with increasing input from meteoric waters into the ore-forming fluids during its formation.