| 西藏班公湖-怒江成矿带荣嘎斑岩型钼矿床的发现及意义 |
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| 引用本文： | 郑有业,次琼,吴松,晋良旭,郭建慈,次仁吉,龚福志,谭勐,张弘强. 西藏班公湖-怒江成矿带荣嘎斑岩型钼矿床的发现及意义[J]. 地球科学, 2017, 42(9): 1441-1453. DOI: 10.3799/dqkx.2017.109 |
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| 作者姓名： | 郑有业 次琼 吴松 晋良旭 郭建慈 次仁吉 龚福志 谭勐 张弘强 |
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| 作者单位： | 1.中国地质大学地质过程与矿产资源国家重点实验室, 北京 100083 |
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| 基金项目： | 教育部长江学者和创新团队发展计划IRT14R54教育部长江学者和创新团队发展计划IRT1083国土资源部公益性行业基金项目201511015西藏地勘局地质找矿专项藏地勘[2015]38号 |
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| 摘 要： | 西藏班公湖-怒江成矿带为近十年来找矿突破明显的一个矿带，矿床类型主要包括斑岩-浅成低温热液型和斑岩-矽卡岩型，矿种以铜金为主，总体研究程度尚低.荣嘎矿床位于班公湖-怒江缝合带南缘西段，为2016年新发现的首例具大型远景的斑岩型钼矿床，其辉钼矿Re-Os同位素加权平均年龄为99.3±0.1 Ma（MSWD=0.2，n=8），等时线年龄为99.2±0.4 Ma（MSWD=0.2，n=8），表明该矿床成矿时代为晚白垩世早期，成矿发生在班公湖-怒江洋盆闭合后的拉萨-羌塘地体碰撞造山阶段.该矿床的发现丰富了班-怒带成矿理论认识，填补了该带钼矿资源的空白，对已有的成矿模型提出了新的挑战，预示着班-怒缝合带还存在一期斑岩钼成矿事件，并为该带进一步寻找相似的钼矿床提供了例证及理论支撑.
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| 关 键 词： | 辉钼矿Re-Os测年 斑岩型钼矿床 荣嘎 班公湖-怒江成矿带 西藏 矿床 |
| 收稿时间： | 2016-12-05 |
The Discovery and Significance of Rongga Porphyry Mo Deposit in the Bangong-Nujiang Metallogenic Belt,Tibet |
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| Abstract: | The Bangong-Nujiang metallogenic belt is a new discovery with obvious prospecting breakthrough in the last ten years, mainly including porphyry-skarn and porphyry-hypothermal types Cu-Au deposits, which are poorly studied. The Rongga deposit located at the western segment of south Bangong-Nujiang suture zone, is the first porphyry Mo deposit discovered in 2016 that has a perspective large scale in the Bangong-Nujiang metallogenic belt. The Rongga deposit yielded a molybdenite Re-Os weighted mean age of 99.3±0.1 Ma (MSWD=0.2, n=8), consistent with the isochron age of 99.2±0.4 Ma (MSWD=0.2, n=8), which indicated the mineralization occurred at early stage of Late Cretaceous during the collision between Lhasa and Qiangtang terranes when the subducted Bangong-Nujiang oceanic crust has closed. This discovery of Rongga deposit has enriched the knowledge of metallogenic theory, filled the gap of Mo resources in this region, and the existed models are challenged in the Bangong-Nujiang belt. This discovery of Rongga deposit show the potential for porphyry Mo mineralization along the Bangong-Nujiang suture zone, and provide an example illustration and theoretical support for further exploration of porphyry Mo deposit in this belt. |
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