吾土布拉格金矿是构造破碎蚀变岩型金矿床,金主要赋存在多金属硫化物石英脉中.对保存于石英中的原生包裹体进行详细研究结果表明:金矿床中含丰富的包裹体,类型复杂多样,有气体包裹体、气液包裹体、液体包裹体、含CO2包裹体4类.包裹体均一温度变化范围较宽(170.℃～315℃),可分为3个区间:170℃～200℃,210℃～250℃和270℃～300℃,但主要集中于170℃～250℃.结合显微镜下观测载金矿物特点,推测金矿形成温度区间主要为170℃～250℃,冰点变化范围较大,在-9.4℃～-1.4℃,对应盐度为0.22％～8.84％;稳定同位素结果表明:硫化物δ34S值为2.2‰～7.6‰,与幔源花岗岩δ34S值接近,反映为深源;成矿I阶段流体的δD值为-105‰～-86‰,δ18OH2O为7.40‰～9.00‰,Ⅱ阶段流体的δD值为-90‰～-74‰,δ18OH2.为5.20‰ ～7.70‰,表明成矿流体来源以岩浆水为主并受大气降水影响.%Wutubulage gold deposit is a fracture-altered rock-type gold deposit.Gold occurs mainly in polymetallic sulphide quartz veins.Fluid inclusion study indicates that there are two major types of fluid inclusions in the gold deposits:CO2-H2O inclusions and NaC1-H2O inclusions.Microthermometric results have shown that the homogenization temperatures of inclusions range between 170℃ and 315℃,mainly between 170℃～250℃,freezing point range from-9.4℃ to1.4℃,salinities 0.22‰～8.84％,The δD values of quartz in the deposits of Ⅰ stage vary between-105‰ and-86‰,while the δ18Omo values of the mineralizing fluids between 7.40‰ and 9.00‰,The δD values of quartz in the deposits of Ⅱ stage vary between-90‰ and-74‰,while the δ18OH2O values of the mineralizing fluids between 5.20‰and 7.70‰,suggesting that the mineralizing fluids originated mainly from magmatic water and accompanied with participation of meteoric water.The δ34S value of sulfide range from 2.2‰ to 7.6‰,same as granite from earth mantle,indicating the sulfur in fluids was derived from the mix of deep-seated acid magma and stratum.
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