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

作　　者：LIN Bin TANG Juxing TANG Pan SUN Yan QI Jing MSANTOSH XIE Jinling DENG Shilin LI Faqiao XIE Fuwei ZHOU Aorigele 

机构地区：[1]MNR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China [2]SinoProbe Laboratory,Chinese Academy of Geological Sciences,Beijing 100094,China [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 Technology,Mianyang,Sichuan 621010,China [4]School of Earth Sciences and Resources,China University of Geosciences(Beijing),Beijing 100083,China [5]Department of Earth Sciences,University of Adelaide,Adelaide SA-5005,Australia [6]Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu 610031,China [7]Regional Geological Survey Team of the Tibetan Bureau of Geology and Mineral Exploration and Development,Lhasa 851400,China [8]College of Earth Science and Key Laboratory of Tectonic Controlled Mineralization and Oil Reservoirs,Chengdu University of Technology,Chengdu 610059,China

出　　处：《Acta Geologica Sinica(English Edition)》2024年第1期83-103,共21页地质学报（英文版）

基　　金：supported by the National Key Research and Development Program of China(Grant No.2022YFC2905001);the National Natural Science Foundation of China(Grant Nos.42272093,42230813);the Basic Research Fund of the Chinese Academy of Geological Sciences(Grant Nos.JKYZD202316,KK2116);the China Scholarship Council project and the Geological Survey project(Grant No.DD20230054).

摘　　要：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 fieldstrength 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.

关 键 词：LA-ICP-MS U-Pb dating GEOCHEMISTRY Rb metallogeny Gariatong TIBET 

分 类 号：P618.77[天文地球—矿床学]