内蒙古阿巴嘎旗比鲁甘干斑岩型钼矿床辉钼矿Re-Os同位素年龄及其地质意义

发布时间：2018-06-23 03:33

本文选题：辉钼矿 + Re-Os同位素年龄　；参考：《地质通报》2016年04期

【摘要】：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。
[Abstract]:According to Re-Os isotopic dating of molybdenum ore, the age range of molybdenum Re-Os isotopic model is 236.9 卤3.7 卤238.7 卤2.4 Ma. and the weighted average age is 237.9 卤1.7 Ma. it shows that the age of formation of the deposit is the Indosinian epoch. The average re content of molybdenum is 74.065 脳 10 ~ (-6), which indicates that the molybdenum is mainly derived from mixed mantle crust. The deposit is a porphyry type molybdenum deposit located in the Soolenshan-Huolingol arc basin of the Xingmeng orogenic system south of the Hegenshan fault zone. Molybdenum ore bodies mainly occur in biotite granitic porphyry and hornstone and are controlled by internal and external contact zone. The ore-bearing faults in the contact zone are mainly NW, NE and EW, and most of them are filled with quartz veins. The more veined and reticulated quartz veins develop, the stronger molybdenum mineralization occurs. Regional studies show that the Indosinian epoch is one of the important metallogenic periods for molybdenum (tungsten) mineralization in the Xingmeng orogenic belt and its adjacent areas, but it is the first time to find it in this area, which provides an important reference for the study of the regional metallogenic regularity of the Solenshan-Hollinggoole metallogenic belt.
【作者单位】：中国地质调查局天津地质调查中心;中国地质科学院国家地质实验测试中心;内蒙古自治区地质调查院;中国地质科学院研究生部;
【基金】：中国地质调查局项目(编号:1212010561510,1212010811061,1212011120330,12120114001201,1212010781028,1212011085488,121201006000150015) 国土资源公益性行业科研专项(编号:200811010) 国家国际科技合作项目(编号:2012DFB20220)
【分类号】：P618.65;P597.3

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