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拜仁达坝-维拉斯托矿床是大兴安岭南段西坡最大的2个热液脉型银矿床,对这两个矿床各阶段矿物(如黑钨矿、浅色闪锌矿、石英和萤石)中的流体包裹体进行研究,并对硫化物进行了硫同位素分析.结果表明,拜仁达坝矿床的流体从早阶段到晚阶段(Ⅰ→Ⅱ→Ⅲ)均一温度和盐度逐渐降低.维拉斯托矿床热液成矿期第Ⅰ、Ⅱ成矿阶段具有高温高盐度的流体;第Ⅲ成矿阶段具有不混溶流体,即中温中盐度的流体(均一温度为208~294℃,盐度含量为4.65%~12.39%)和高温低盐度的流体(均一温度为333~406℃,盐度含量为3.55%~6.88%);第Ⅳ成矿阶段具有低温较低盐度的流体.两个矿床的流体包裹体气相成分表明成矿流体均为CO2-H2O-NaCl体系.拜仁达坝矿床的均一温度和盐度随着成矿阶段逐渐降低和氢氧同位素证据均表明,早阶段的流体主要为岩浆水来源,晚阶段的流体混入了大气降水.维拉斯托矿床氢氧同位素证据和流体中的成分(CH4/C2H6为39.271%~101.438%)均表明其成矿流体主要为岩浆水来源.拜仁达坝-维拉斯托矿床的硫具有深源特征,拜仁达坝矿床的成矿机制主要与不同来源的成矿流体混合有关;维拉斯托矿床的成矿机制主要与降温和成矿流体不混溶有关.
Bayren Dam - The Veloreto deposit is the largest of two hydrothermal vein-type silver deposits on the western slope of the southern segment of the Greater Xing’an Mountains. Mineral deposits of various stages of the two deposits, such as wolframite, light-colored sphalerite, quartz and fluorite ) Fluid inclusions were studied and the sulfur isotopes were analyzed.The results show that the homogenization temperatures and salinities of the fluids in Bayren Dam have gradually decreased from early stage to late stage (Ⅰ → Ⅱ → Ⅲ) The metallogenic stage Ⅰ, Ⅱ of the Rastor mineralization stage has high temperature and high salinity fluid. Stage Ⅲ metallogenetic stage has an immiscible fluid, that is, a medium temperature salinity fluid (with a homogenization temperature of 208-2994 ℃ , Salinity of 4.65% ~ 12.39%) and high temperature and low salinity fluids (homogenization temperature 333 ~ 406 ℃, salinity content 3.55% ~ 6.88%); The fluid composition of the fluid inclusions in the two deposits indicates that the ore-forming fluids are both CO2-H2O-NaCl systems.The homogenization temperature and salinity of the Bayren Dam deposit decrease gradually with the formation of the ore-forming stage and both hydrogen and oxygen isotope evidence Stage fluid is mainly magmatic water source, late stage fluid mixed with atmospheric precipitation. The evidence of hydrogen and oxygen isotopes and the composition of the fluids (CH4 / C2H6: 39.271% -101.438%) indicate that the ore-forming fluid is mainly derived from magmatic water. The sulfur in the Bayren Dam-Villasto deposit has deep- The mineralization mechanism of Damu deposit is mainly related to the mixing of ore-forming fluids from different sources. The metallogenic mechanism of the Vastor deposit is mainly related to the immiscibility of cooling and ore-forming fluids.