西藏嘎日阿统超大型花岗岩铷矿床锆石U-Pb年龄及铷的赋存状态
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1.西南交通大学地球科学与环境工程学院;2.中国地质科学院矿产资源研究所;3.西南科技大学环境与资源学院;4.中国地质大学(北京),地球科学与资源学院;5.西藏地质矿产勘查开发局区域地质调查大队;6.西藏地质矿产勘查开发局第六地质大队

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国家重点研发计划项目(编号:2022YFC2905001)、中国地质科学院基本科研业务费专项(编号:JKYZD202316)、国家自然科学基金项目(编号:42272093, 42230813)和中国地质调查局项目(编号:DD20221684)联合资助


Zircon U-Pb ages and Rubidium occurrence of the giant Gariatong granite-type rubidium deposit, Tibet
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1.Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu;2.MNR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,CAGS;3.The Key Laboratory of the Ministry of Education on Solid Waste Treatment and Recycling,School of Environment and Resource,Southwest University of Science and;4.School of Earth Sciences and Resources,China University of Geosciences;5.Regional Geological Survey Brigade,Tibet bureau of Geology and Mineral Exploration and Development;6.No.6 Geological party,Tibet bureau of Geology and Mineral Exploration and Development

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    摘要:

    青藏高原广泛分布大量的高分异花岗岩,但其稀有金属的成矿潜力和找矿方向尚不清晰。嘎日阿统矿床是近年来在拉萨地体中部新发现的超大型花岗岩型铷矿床。详细的地质调查和钻孔编录结果显示,嘎日阿统矿床铷矿化主要赋存在二长花岗岩及其围岩中。锆石U-Pb测年结果显示含矿的二长花岗岩的加权平均年龄为 20.0 ± 0.5 Ma(n=14,MSWD=1.8),说明其是中新世岩浆侵位的产物。显微矿物学及电子探针分析数据揭示铷主要以类质同象的形式赋存在白云母和黑云母中,未发现独立的富铷矿物。此外,白云母和黑云母的地球化学特征,进一步揭示与成矿作用有关的岩浆起源于低氧逸度环境下壳源物质重熔,岩浆经过强烈的结晶分异后形成的富氟岩浆热液,最终形成大规模铷矿床。最后,嘎日阿统超大型花岗岩铷矿床的发现,不仅丰富了中国铷矿资源的分布规律,也支撑了青藏高原高分异花岗岩的稀有金属的勘查评价。

    Abstract:

    Lots of highly differentiated granites are widely distributed on the Qinghai-Tibet Plateau, but their mineralization and exploration potential for rare metals were unclear. The Gariatong deposit is a newly discovered giant granite-type rubidium deposit in the central Lhasa terrane, recently. The detailed geological survey and borehole logging of the Gariatong deposit revealed that the rubidium mineralization is mainly hosted in monzogranite and surrounding rocks. Zircon U-Pb dating results show that the weighted average ages of the ore-bearing monzonite is 20.0±0.5 Ma (n=14, MSWD=1.8), which suggested that the intrusion occurred in the Miocene. Detailed petrography and electron microprobe analyses revealed that rubidium is mainly host in muscovite and biotite in an isomorphism form, and no independent rubidium minerals are seen. The geochemical characteristics of muscovite and biotite revealed that the magma associated to mineralization is the product of remelting of crustal-derived material in a low-oxygen fugacity environment, and the formation of fluoride-rich magmatic hydrothermal fluids after strong differentiation is the key to the formation of large-scale rubidium mineralization. The discovery of the giant granite-type rubidium deposit in the Gariatong not only enriched distribution of rubidium mineral resources in China, but also support the prospecting of rare metals in highly differentiated granites on the Qinghai-Tibet Plateau.

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  • 收稿日期:2023-08-13
  • 最后修改日期:2024-01-17
  • 录用日期:2024-01-20
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