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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δ~(34)S值为2.2‰~7.6‰,与幔源花岗岩δ~(34)S值接近,反映为深源;成矿Ⅰ阶段流体的δD值为-105‰~-86‰,δ~(18)O_(H2O)为7.40‰~9.00‰,Ⅱ阶段流体的δD值为-90‰~-74‰,δ~(18)O_(H2O)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。
Wudu Bragg Gold Mine is a structurally fractured alteration-type gold deposit, gold is mainly present in the polymetallic sulfide quartz veins. A detailed study of the primary inclusions stored in quartz shows that the gold deposits are rich in inclusions and are complex and diverse in types, including gas inclusions, gas-liquid inclusions, liquid inclusions and four types of inclusions containing CO2. The homogenization temperature of the inclusions varies widely (170 ℃ ~ 315 ℃) and can be divided into three intervals: 170 ℃ ~ 200 ℃, 210 ℃ ~ 250 ℃ and 270 ℃ ~ 300 ℃, but mainly in the range of 170 ℃ ~ 250 ℃ . According to the characteristics of the gold-bearing minerals observed under a microscope, it is speculated that the formation temperature range of gold deposits is mainly from 170 ℃ to 250 ℃, with a wide range of freezing points ranging from -9.2 ℃ to -1.4 ℃ and a salinity of 0.22% to 8.84%. Stable isotopes The results show that δ 5 S value of sulfide ranges from 2.2 ‰ to 7.6 ‰, which is close to δ 34 S value of mantle source granite, which is reflected by deep source. The δD value of Ⅵ fluid is -105 ‰ ~ -86 ‰, δ 18 O 2 -H2O ranged from 7.40 ‰ to 9.00 ‰, and the δD values of the second-stage fluids ranged from -90 ‰ to -74 ‰ and the δ 18 O 2 O values ranged from 5.20 ‰ to 7.70 ‰ , Indicating that the source of ore-forming fluid is mainly magmatic water and is affected by the precipitation.