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采用辉钼矿Re-Os同位素定年,获得的内蒙古阿巴嘎旗比鲁甘干钼矿的辉钼矿Re-Os同位素模式年龄变化范围为236.9±3.7~238.7±2.4Ma,年龄加权平均值为237.9±1.7Ma,表明该矿床形成时代应为印支期。辉钼矿的Re含量平均值为74.065×10~(-6),表明其主要为幔壳混合来源特征。该矿床位于贺根山断裂带以南的兴蒙造山系索伦山-霍林郭勒弧盆系内,为斑岩型钼矿床。钼矿体主要赋存在黑云母花岗斑岩和角岩内,受内外接触带控制。接触带控矿容矿断裂主要有北西向、北东向及近东西向,其内多充填有石英脉。细脉状、网脉状石英脉越发育,钼矿化越强。区域研究表明,印支期是兴蒙造山带及其邻区钼(钨)成矿的重要成矿期之一,但在本区尚属首次发现,为开展索伦山-霍林郭勒成矿带区域成矿规律研究提供了重要参考。
The Re-Os isotopic dating of molybdenite from the Re-Os isotope of molybdenite shows that the range of Re-Os isotopic ages of molybdenite from 236 to 3.7 ~ 238.7 ± 2.4Ma for the molybdenite from Lulugan dry molybdenum in Abagag Banner, Inner Mongolia is 236.9 ± 3.7 ~ 238.7 ± 2.4Ma, 237.9 ± 1.7Ma, indicating that the formation of the deposit should be Indosinian. The average Re content of molybdenite is 74.065 × 10 ~ (-6), indicating that it is mainly characterized by mantle-shell mixed source. This deposit is located in the Suoernshan-Huolinqole basin of the Xingmeng orogenic belt south of the Hegengshan fault zone and is a porphyry-type molybdenum deposit. The molybdenum ore body mainly exists in biotite granite porphyry and hornfelt, controlled by the contact zone inside and outside. The ore-bearing faults with ore-controlling are mainly northwest, northeast and near east-west, with quartz veins filled in them. Veins, reticulate vein more development, the stronger the mineralization of molybdenum. Regional studies show that the Indosinian is one of the important metallogenic stages of the molybdenum (tungsten) mineralization in the Xingmeng orogenic belt and its adjacent areas. However, it is the first time that Indosinian-Hollinguole Ore zone metallogenic regulation provides an important reference.