Geochronology and Geochemistry of Ore-related Granitoids in the Giant Gariatong Rb Deposit,Tibet and Implications for Rb Metallogeny in China

LIN Bin ¹TANG Juxing ¹TANG Pan ²SUN Yan ³QI Jing ³M.SANTOSH ⁴XIE Jinling ⁵DENG Shilin ⁶LI Faqiao ³XIE Fuwei ⁷ZHOU Aorigele¹

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作者信息

1. MNR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China;SinoProbe Laboratory,Chinese Academy of Geological Sciences,Beijing 100094,China
2. The Key Laboratory of the Ministry of Education on Solid Waste Treatment and Recycling,School of Environment and Resource,Southwest University of Science and Technology,Mianyang,Sichuan 621010,China
3. MNR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China
4. School of Earth Sciences and Resources,China University of Geosciences(Beijing),Beijing 100083,China;Department of Earth Sciences,University of Adelaide,Adelaide SA-5005,Australia
5. Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu 610031,China
6. Regional Geological Survey Team of the Tibetan Bureau of Geology and Mineral Exploration and Development,Lhasa 851400,China
7. College of Earth Science and Key Laboratory of Tectonic Controlled Mineralization and Oil Reservoirs,Chengdu University of Technology,Chengdu 610059,China
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Abstract

Rubidium(Rb)deposits mostly occur in the South China and Central Asia orogenic belts and are often closely associated with highly differentiated granites.This study investigates a newly-discovered giant Rb deposit at Gariatong in the Central Lhasa terrane in Tibet.Detailed field studies and logging data revealed that the Rb mineralization mainly occurs in monzogranite and is related to greisenization.LA-ICP-MS U-Pb dating of zircon yielded ages of 19.1±0.2 Ma and 19.0±0.2 Ma for greisenized monzogranite and fresh monzogranite,respectively.The monzogranites are characterized as strongly peraluminous,with high contents of SiO2,Al2O3,K2O and Na2O as well as a high differentiation index.They are enriched in light rare earth and large ion lithophile elements with significant negative Eu anomalies and depleted high field-strength elements.Petrological and geochemical features of these ore-related monzogranites suggest that they are highly fractionated S-type granites,derived from remelting of crustal materials in a post-collisional setting.The geochemistry of zircon and apatite points to a low oxygen fugacity of the ore-related monzogranite during the magma's evolution.The discovery of the Gariatong Rb deposit suggests that the Central Lhasa terrane may be an important region for rare metal mineralization.

Key words

LA-ICP-MS U-Pb dating/geochemistry/Rb metallogeny/Gariatong/Tibet

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基金项目

National Key Research and Development Program of China(2022YFC2905001)

National Natural Science Foundation of China(42272093)

National Natural Science Foundation of China(42230813)

Basic Research Fund of the Chinese Academy of Geological Sciences(JKYZD202316)

Basic Research Fund of the Chinese Academy of Geological Sciences(KK2116)

China Scholarship Council project and the Geological Survey project(DD20230054)

出版年

2024

地质学报(英文版)

中国地质学会

地质学报(英文版)

CSTPCD

影响因子：1.414

ISSN：1000-9515

参考文献量17

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