西藏班公湖-怒江成矿带荣嘎斑岩型钼矿床的发现及意义

发布时间：2018-04-18 07:30

本文选题：辉钼矿Re-Os测年 + 斑岩型钼矿床　；参考：《地球科学》2017年09期

【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±0.1Ma(MSWD=0.2,n=8),等时线年龄为99.2±0.4Ma(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.
[Abstract]:The Bangonghu-Nujiang metallogenic belt in Tibet is a ore belt with obvious ore breakthrough in the past ten years. The deposit types mainly include porphyry-epithermal hydrothermal type and porphyry skarn type. The main ore types are copper and gold, and the overall research level is still low.Located in the west of the southern margin of Bangong Lake-Nujiang suture zone, Rongga deposit is the first porphyry type molybdenum deposit to be discovered in 2016.The weighted average age of Re-Os isotopes of molybdenum deposit is 99.3 卤0.1MaM MSWDU 0.2NU 8G, and the isochron age is 99.2 卤0.4MaM MSWDU 0.2ndf8, indicating that the ore forming age of the deposit was early late Cretaceous, and the mineralization occurred in Lhasa-Qiangtang collision orogenic stage after the closure of Bangonghu Lake and Nujiang ocean basin.The discovery of the deposit enriches the understanding of metallogenic theory in the Ban-Nu belt, fills up the blank of molybdenum resources in the belt, puts forward new challenges to the existing metallogenic models, and indicates that there is still a porphyry molybdenum metallogenic event in the Ban-Nuo suture zone.It also provides an example and theoretical support for the further exploration of similar molybdenum deposits in this zone.
【作者单位】：中国地质大学地质过程与矿产资源国家重点实验室;中国地质大学地球科学与资源学院;西藏自治区地质矿产勘查开发局第二地质大队;西藏自治区地质矿产勘查开发局;西藏自治区地质矿产勘查开发局第六地质大队;
【基金】：国土资源部公益性行业基金项目(No.201511015) 教育部长江学者和创新团队发展计划(Nos.IRT14R54,IRT1083) 西藏地勘局地质找矿专项(No.藏地勘[2015]38号)
【分类号】：P618.65

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