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蒙库大型铁矿位于阿尔泰南缘麦兹盆地,赋存于晚志留世-早泥盆世变质火山-沉积岩系中,容矿岩石为石榴石矽卡岩、变粒岩、浅粒岩和大理岩。矿体总体顺层分布,空间上与矽卡岩密切相关。对1号矿体含黄铁矿辉钼矿石英大脉中辉钼矿Re-Os同位素年代学进行了研究,7件样品的Re-Os同位素模式年龄为(261.6±3.7)～(264.0±3.6)Ma,加权平均值为262.9±1.4Ma,等时线年龄为261±6.9Ma,表明蒙库矿区在中二叠世晚期存在一次热液活动和铜钼矿化事件,同时也限定了铁主成矿时间早于中二叠世,可能是早泥盆世。辉钼矿样品的Re含量为(22.74～35.69)μg/g,指示钼铜成矿物质具有壳幔混合的特征。
The Mengku large iron ore deposit is located in the Meizi basin on the southern margin of Altai and occurs in the Late Silurian-Early Devonian metamorphic volcano-sedimentary rock series. The ore-hosting rocks are garnet skarn, granulite, Marble. The ore body is generally distributed in layers and is closely related to skarn in space. The Re-Os isotopic chronology of the molybdenite in the quartz vein of molybdenite-hosted molybdenite ore No. 1 was studied. The Re-Os isotope age of the seven samples was (261.6 ± 3.7) ~ (264.0 ± 3.6) ) Ma, with a weighted average of 262.9 ± 1.4Ma and an isochron age of 261 ± 6.9Ma, indicating that there was a hydrothermal event and copper-molybdenum mineralization in the late Middle Permian in the Mengku mining area, The metallogenic time is earlier than that of the Middle Permian, which may be Early Devonian. The Re content of molybdenite samples ranged from (22.74 to 35.69) μg / g, indicating that molybdenum and copper mineralization have the characteristics of crust-mantle mixing.