锡田地区汇源钨矿床流体包裹体特征研究

Study of Characteristics of Fluid Inclusions of Huiyuan Tungsten Deposit in Xitian Ore Field

汇源钨矿是湖南锡田地区典型的石英脉型钨矿床,在详尽的野外工作基础上,划分了成矿阶段,并对各个成矿阶段的石英脉中流体包裹体进行岩相学、显微测温研究.结果表明,区内的流体包裹体主要为气液两相包裹体和含CO_2包裹体.研究表明,汇源钨矿的成矿压力49~156 MPa,成矿深度为1.8~5.8 km.流体热焓-盐度变异图解表明成矿流体的成矿作用早阶段以混合作用为主,主阶段和晚阶段以沸腾作用为主.

Huiyuan tungsten is an quartz-vein type wolfram deposit in Xitian ore field, Hunan Province, China. On the basis of detailed field geological investigation, the metallogentic stage is divided, meanwhile, the fluid inclusions with each ore- forming stage are investigated by using mierothermonetry. Experimental results show that the quartz crystals can be classi- fied into aqueous and gas two-phase and CO2-bearing phase inclusions. The studies show that the metallogentic is estimated to be 49MPa ~ 156 MPa, equivalent to depth from 1.8 km to 5.8 kin. Enthalpy-salinity plot indicates that mixing appears as most dominating process in the early stage and boiling appears as most dominating process in the main stage and late stage.