Re-Os isotopic dating of molybdenites from the Bilugangan porphyry Mo deposit in Abag Banner, Inner Mongolia, and its geological significa
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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。
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关键词:
- 辉钼矿 /
- Re-Os同位素年龄 /
- 比鲁甘干钼矿
Abstract:In this paper, the authors conducted for the first time Re-Os isotope analysis of molybdenite from the Bilugangan porphy-ry Mo deposit in Abag Banner, Inner Mongolia and obtained the molybdenite Re-Os isotope modal ages between 236.9± 3.7Ma and 238.7± 2.4Ma and weighted average value of 237.9± 1.7Ma, which indicate that the mineralization of Bilugangan Mo deposit oc-curred in Indosinian period. The average rhenium content of molybdenite is 74.065× 10-6, suggesting the source of rhenium was char-acterized by mantle-crust mixing. Belonging to a porphyry Mo deposit, the deposit is located within the Slonker-Huolinguole arcbasin system of Da Hinggan Mountains-Inner Mongolia orogenic belt south of Hegenshan fault belt. Controlled by internal or exter-nal contact zones, the Mo orebodies are mainly situated inside the biotite granite porphyry and hornstone. The controlling or hosting faults in the contact zones are principally in NW, NE and approximately EW directions, and are filled with quartz veins. The stronger the development of stringer and stockwork quartz veins, the stronger the molybdenum mineralization. Regional researches reveal that Indosinian is one of the most important Mo(W) mineralization stages in Da Hinggan Mountains-Inner Mongolia orogenic belt and the adjacent areas in spite of the fact that this kind of deposit was discovered for the first time in this region. The results obtained by the authors provide important references for the further study of ore-forming regularity in the Slonker-Huolinguole metallogenic belt.
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Keywords:
- molybdenite /
- Re-Os isotope age /
- Bilugangan Mo deposit
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致谢: 中国地质调查局天津地质调查中心冉书明教授级高工参加了野外取样工作，沈保丰研究员审阅了全文并提出了宝贵的修改意见，在此一并表示诚挚的谢意。
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图 1 比鲁甘干钼矿床地质简图
1—黑云母二长花岗岩；2—玄武岩；3—砂质板岩；4—长石石英砂岩、细砂岩、角岩；5—采样点
Figure 1. Geological sketch map of the Bilugangan Mo deposit
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图 2 比鲁甘干钼矿床围岩和辉钼矿矿石标本
a—花岗岩；b—辉钼矿石英脉
Figure 2. Host rock and molybdenite specimens in Bilugangan molybdenum deposit
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图 3 比鲁甘干钼矿床中辉钼矿Re-Os同位素等时线（a）和模式年龄加权平均值（b）
Figure 3. Re-Os isochron age (a) and weighted mean age (b)of molybdenite from the Bilugangan Mo deposit
表 1 比鲁甘干钼矿床辉钼矿单矿物Re-Os同位素数据
Table 1 Re-Os isotopic data of molybdenite from the Bilugangan Mo deposit
样号 样重/g Re/10-6 普Os/10-9 187Re/10-6 187Os/10-9 模式年龄/Ma 测定值 不确定度 测定值 不确定度 测定值 不确定度 测定值 不确定度 测定值 不确定度 IMD25-2 0.05036 85.73 0.85 0.0073 0.0082 53.88 0.53 214.5 1.7 238.5 3.6 IMD25-1 0.02560 71.57 0.61 0.0233 0.1045 44.98 0.38 178.2 1.4 237.3 3.4 IMD25-3 0.02503 67.56 0.71 0.0225 0.0756 42.46 0.45 167.9 1.4 236.9 3.7 IMD25-4 0.02512 71.40 0.55 0.0235 0.0528 44.87 0.34 178.8 1.5 238.7 3.4 
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