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乌吐布拉克中型铁矿床赋存于上志留统-下泥盆统康布铁堡组变质火山-沉积岩系中,矿体呈似层状、透镜状,矿体及其周围发育大量矽卡岩矿物组合。早期矽卡岩阶段包裹体均一温度为256～534℃,盐度为11.90%～>73.96%NaCleqv,密度为0.56～0.96g/cm3,表明成矿流体为高-中温、高-中盐度、高-中密度的NaCl-H2O体系;退化蚀变阶段包裹体均一温度为188～313℃,盐度为12.30%～>39.76%NaCleqv,密度为0.83～1.05g/cm3,表明成矿流体为中温、中-低盐度、高-中密度的NaCl-H2O体系。石英-硫化物-碳酸盐阶段包裹体均一温度为162～320℃,盐度为2.90%～15.57%NaCleqv,密度为0.70～1.02g/cm3,成矿流体为NaCl-H2O-CO2±CH4或N2型流体。石榴子石氢氧同位素表明早期矽卡岩阶段成矿流体主要来源于岩浆水,石英及方解石的氢氧同位素暗示石英-硫化物-碳酸盐阶段存在低温、低盐度的大气降水的加入。方解石的碳、氧同位素表明流体中碳主要来自深部岩浆。硫化物硫同位素表明硫来源于岩浆硫。成矿机制可能为早三叠世岩浆热液交代上志留-下泥盆统康布铁堡组火山岩形成矽卡岩矿物,在矽卡岩退化蚀变过程中形成铁矿体。
The Utbulak medium-sized iron ore deposit is hosted in the metamorphic volcano-sedimentary rock series of the Upper Silurian-Lower Devonian Kangbotebur Formation. The ore body is stratified and lenticular, with a large amount of silicon Carbone mineral combination. The homogenization temperature of early skarn stage inclusions is from 256 to 534 ℃, and the salinities range from 11.90% to> 73.96% NaCleqv with a density of 0.56-0.96 g / cm3, indicating that the ore fluids are high-medium temperature, high-medium salinity, The NaCl-H2O system with high-medium density was used. During the degenerated alteration stage, the homogenization temperature of the inclusions was 188-313 ℃ and the salinity was 12.30% ~> 39.76% NaCleqv. The density was 0.83-1.05 g / cm3, indicating that the ore- , Medium - low salinity, high - medium density NaCl-H2O system. The homogenization temperature of quartz-sulphide-carbonate phase inclusions is 162-320 ℃, the salinity is 2.90% -15.57% NaCleqv, the density is 0.70-1.02 g / cm3, the ore-forming fluid is NaCl-H2O-CO2 ± CH4 or N2 fluid. Hydrocarbon isotopes of garnet indicate that the ore-forming fluid in the early skarn stage is mainly derived from magmatic water. The hydrogen and oxygen isotopes of quartz and calcite suggest the presence of low-temperature and low-salinity precipitation in the quartz-sulphide-carbonate stage. The carbon and oxygen isotopes of calcite show that the carbon in fluids mainly comes from deep magma. Sulfide sulfur isotopes indicate that sulfur is derived from magmatic sulfur. The mineralization mechanism may be that the Early Triassic magmatic hydrothermal metasomatism of the Upper Silurian-Lower Devonian volcanic rocks formed skarn minerals and formed iron ore bodies during the degenerated alteration of skarn.