| 藏东拉荣斑岩钨钼矿床辉钼矿Re- Os定年及地质意义 |
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| 引用本文： | 刘俊,祝向平,李文昌,王保弟,董宇,杨富成,杨后斌,吴江华.藏东拉荣斑岩钨钼矿床辉钼矿Re- Os定年及地质意义[J].地质学报,2019,93(7):1708-1719. |
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| 作者姓名： | 刘俊 祝向平 李文昌 王保弟 董宇 杨富成 杨后斌 吴江华 |
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| 作者单位： | 中国地质调查局成都地质调查中心 ,成都 ,610081;中国地质大学资源学院,武汉 ,430074;中国地质调查局成都地质调查中心 ,成都 ,610081;西藏自治区地质矿产勘查开发局第六地质大队 ,拉萨 ,850000;昆明理工大学 ,昆明,650093 |
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| 基金项目： | 本文为中国地质调查局项目（编号 DD20179604和DD20160016），云南省科学技术奖 杰出贡献奖项目（编号 2017001）和中国地质调查局成都地质调查中心青藏高原大科学计划项目联合资助的成果。 |
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| 摘 要： | 拉荣钨钼矿床位于类乌齐-左贡成矿带的东南部,是藏东地区发现的首例大型斑岩型钨钼矿床。其成矿地质背景尚缺乏成矿年龄制约。本文对拉荣矿床含矿石英脉中的辉钼矿进行Re-Os定年,6件样品的模式年龄集中于91.5±1.3～92.3±1.3 Ma,其加权平均年龄为91.8±0.5 Ma,等时线年龄为90.6±2.1 Ma,表明拉荣钨钼矿床成矿时代为晚白垩世。辉钼矿样品的Re含量为53.0×10~(-6)～86.1×10~(-6),表明成矿物质具有壳幔混源的特征。拉荣钨钼矿床成矿年龄指示了班公湖-怒江构造带北东侧类乌齐-左贡成矿带内存在一期晚白垩世的钨多金属成矿事件,成矿作用发生于拉萨-羌塘地体碰撞造山阶段。
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| 关 键 词： | 拉荣 斑岩钨钼矿床 辉钼矿Re-Os定年 类乌齐-左贡成矿带 碰撞造山 |
| 收稿时间： | 2018/8/22 0:00:00 |
| 修稿时间： | 2018/10/31 0:00:00 |
Molybdenite Re- Os dating of the Larong porphyry W- Mo deposit in eastern Tibet and its geological significance |
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| LIU Jun,ZHU Xiangping,LI Wenchang,WANG Baodi,DONG Yu,YANG Fucheng,YANG Houbin and WU Jianghua.Molybdenite Re- Os dating of the Larong porphyry W- Mo deposit in eastern Tibet and its geological significance[J].Acta Geologica Sinica,2019,93(7):1708-1719. |
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| Authors: | LIU Jun ZHU Xiangping LI Wenchang WANG Baodi DONG Yu YANG Fucheng YANG Houbin and WU Jianghua |
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| Abstract: | The Larong W- Mo deposit, located in the southeastern part of the Leiwuqi- Zuogong metallogenic belt, is the first giant porphyry W- Mo deposit discovered in eastern Tibet. The metallogenic setting of this deposit is unclear due to lack of constraints on metallogenic chronology. Six samples of molybdenite from ore- bearing quartz veins were carried out for Re- Os isotopic dating, and the model ages obtained range from 91. 5±1.3 Ma to 92.3±1.3 Ma, with an isochron age of 90.6±2.1 Ma and a weighted mean age of 91. 8±0.5 Ma, indicating that the mineralization of the Larong deposit occurred at the Late Cretaceous. The Re content of molybdenite ranges from 53.0×10-6 to 86.1×10-6, suggesting that the metallogenic material originated from a crust- mantle mixed source. The metallogenic age of the Larong W- Mo deposit indicates that the Later Cretaceous tungsten polymetallic mineralization event occurred in the Leiwuqi- Zuogong metallogenic belt in the northeastern section of Bangonghu- Nujiang tectonic belt, with mineralization occurring in the Lhasa- Qiangtang collisional orogenic setting. |
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| Keywords: | Larong porphyry W- Mo deposit molybdenite Re- Os dating Leiwuqi- Zuogong metallogenic belt collisional orogeny |
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