西藏玉龙铜矿带包买矿床含矿斑岩锆石U-Pb年代学

发布时间：2018-01-31 16:26

本文关键词： 锆石U-Pb年代学斑岩铜钼矿床玉龙铜矿带矿床年代学　出处：《地球科学》2017年09期 　论文类型：期刊论文

【摘要】：包买斑岩型铜钼矿床是西藏玉龙铜矿带北段重要组成部分,具有典型的斑岩型矿化、蚀变特征.最新勘查进展揭示其铜、钼资源量均已达中型矿床规模,但理论研究工作仍十分薄弱.以矿区基本地质特征为基础,运用LA-ICP-MS锆石U-Pb年代学方法,精确获得包买矿区与成矿有关的黑云母花岗岩和黑云母二长花岗岩侵位时代分别为:41.3±0.2Ma和40.8±0.2Ma,与玉龙、扎那尕等矿床一致,是始新世印度大陆与欧亚大陆碰撞造山过程的产物.综合区域已有年代学证据,玉龙铜矿带与成矿有关的斑岩体主要集中侵位于37~42Ma,可能不存在明显的早(51Ma)、中(41Ma)、晚(33Ma)三期,且从北西向南东,成岩成矿时代也没有明显降低变新的趋势.
[Abstract]:Baomai porphyry copper-molybdenum deposit is an important part of the northern section of the Yulong copper ore belt in Tibet and has typical porphyry mineralization and alteration characteristics. But the theoretical research work is still very weak. Based on the basic geological characteristics of the ore area, the LA-ICP-MS zircon U-Pb geochronology method is used. The emplacement ages of biotite granites and biotite monzonitic granites related to mineralization in Baomai ore area are respectively: 41.3 卤0.2 Ma and 40.8 卤0.2 Ma, respectively, and Yulong. The Zanagar and other deposits are the result of collision orogeny between the Indian continent and Eurasia in the Eocene. The ore-forming porphyry in the Yulong copper belt is mainly concentrated in 37U 42Ma. there may be no obvious three phases, namely, 51Ma, 41Mag, 33Ma). From north to west to south to east, the diagenetic and metallogenic age did not decrease the trend of change obviously.
【作者单位】：中国地质科学院矿产资源研究所国土资源部成矿作用与资源评价重点实验室;澳大利亚塔斯马尼亚大学卓越矿床研究中心;西藏地勘局地热地质大队;北京中矿联咨询中心;西藏大川矿业有限公司;西藏翼龙矿业有限公司;
【基金】：中国地质调查局公益性行业科研专项(Nos.201511017,201511022-02) 国家自然科学基金(Nos.41403040,41402178) 中国地质科学院基本科研业务费(No.YYWF201608) 国家留学基金委资助成果
【分类号】：P597.3;P618.41
【正文快照】： 斑岩铜(钼)矿床一直是世界上资源储量大、经济效益高、分布范围广的一类矿床(芮宗瑶等,1984,2006;侯增谦,2004;Richard,2009;Sillitoe,2010;冷秋锋等,2016;丁帅等,2017).西藏东部玉龙斑岩铜矿带已产出1个超大型(玉龙)、2个大型(马拉松多、多霞松多)、3个中型(扎那尕、莽总、包

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