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Highly fractionated leucogranites in the eastern Himalayan Cuonadong dome and related magmatic Be-Nb-Ta and hydrothermal Be-W-Sn mineralization

文献类型：期刊论文

作者Xie, Lei1; Tao, Xiangyuan1; Wang, Rucheng1; Wu, Fuyuan2; Liu, Chen1; Liu, Xiaochi2; Li, Xingkui1; Zhang, Rongqing1
刊名LITHOS
出版日期2020-02-01
卷号354页码:19
ISSN号0024-4937
关键词Beryl Columbite Tapiolite U-(Th)-Pb dating Differentiation of leucogranite Southern Tibet
DOI10.1016/j.lithos.2019.105286
英文摘要Leucogranitic rocks, including two-mica granite, muscovite granite, and granitic pegmatite (aplite), crop out in the eastern Himalayan Cuonadong dome, southern Tibet. These rocks have high SiO2 (similar to 73 wt.%), Al2O3(similar to 16 wt.%), and total alkali contents (similar to 9 wt.%), and are peraluminous with A/CNK ratios of 1.0-1.1. Whole-rock major and trace element data and mineral compositions reveal strong differentiation and fractionation trends for the two-mica granite, muscovite granite, and pegmatite-aplite dikes. Albite, muscovite, and garnet contents increased as the leucogranitic magma evolved, whereas K-feldspar and biotite contents decreased. Muscovite in aplite has higher Rb2O (similar to 0.4 wt.%), Nb (similar to 219 ppm), and W + Sn (similar to 737 ppm) contents, and lower Nb/Ta ratios (similar to 6) than muscovite in the two-mica and muscovite granites. Garnet varies in composition from almandine in the leucogranites to spessartine in the aplites. The muscovite granite and pegmatite are associated with rare-metal mineralization. Rare-metal-bearing minerals include beryl, columbite-group minerals, tapiolite, Nb-Ta-bearing rutile, cassiterite, and wolframite. Skarn and altered (i.e., chloritized) rocks along the margins of the leucogranites are the products of hydrothermal reaction between leucogranite and marble. Beryl, scheelite, and cassiterite occur in the skarn and altered rocks. Rare-metal mineralization in the Cuonadong dome can be divided into two types: magmatic Be-Nb-Ta mineralization related to pegmatite-aplite dikes and hydrothermal Be-W-Sn mineralization hosted in the skarn and associated with the two-mica and muscovite granites. Monazite U-Th-Pb dating reveals two episodes of leucogranitic magmatism in the Cuonadong dome at ca. 20 and 17 Ma. Columbite U-Pb dating indicates two stages of rare-metal mineralization at ca. 17 and 14 Ma (including tapiolite). It is inferred that magmatism was related to the exhumation of the Higher Himalayan Crystalline Basement, with the degree of differentiation of the associated leucogranites being the key factor controlling the type of mineralization. (C) 2019 Elsevier B.V. All rights reserved.
WOS关键词OXIDE MINERALS ; TRACE-ELEMENTS ; GEOCHEMICAL EVIDENCE ; TETHYAN HIMALAYA ; JIANGXI PROVINCE ; SOUTHERN TIBET ; GRANITIC MELTS ; U-PB ; PEGMATITE ; DEPOSIT
资助项目Natural Science Foundation of China[91855209] ; Natural Science Foundation of China[41572045] ; Second Comprehensive Scientific Investigation into Qinghai-Tibet Plateau[2019QZKK0803] ; Fundamental Research Funds for the Central Universities, China[14380087]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
出版者ELSEVIER
WOS记录号WOS:000514217200041
资助机构Natural Science Foundation of China ; Natural Science Foundation of China ; Second Comprehensive Scientific Investigation into Qinghai-Tibet Plateau ; Second Comprehensive Scientific Investigation into Qinghai-Tibet Plateau ; Fundamental Research Funds for the Central Universities, China ; Fundamental Research Funds for the Central Universities, China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Second Comprehensive Scientific Investigation into Qinghai-Tibet Plateau ; Second Comprehensive Scientific Investigation into Qinghai-Tibet Plateau ; Fundamental Research Funds for the Central Universities, China ; Fundamental Research Funds for the Central Universities, China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Second Comprehensive Scientific Investigation into Qinghai-Tibet Plateau ; Second Comprehensive Scientific Investigation into Qinghai-Tibet Plateau ; Fundamental Research Funds for the Central Universities, China ; Fundamental Research Funds for the Central Universities, China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Second Comprehensive Scientific Investigation into Qinghai-Tibet Plateau ; Second Comprehensive Scientific Investigation into Qinghai-Tibet Plateau ; Fundamental Research Funds for the Central Universities, China ; Fundamental Research Funds for the Central Universities, China
源URL[http://ir.iggcas.ac.cn/handle/132A11/95588]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Xie, Lei
作者单位1.Nanjing Univ, Sch Earth Sci & Engn, State Key Lab Mineral Deposits Res, Nanjing 210023, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Xie, Lei,Tao, Xiangyuan,Wang, Rucheng,et al. Highly fractionated leucogranites in the eastern Himalayan Cuonadong dome and related magmatic Be-Nb-Ta and hydrothermal Be-W-Sn mineralization[J]. LITHOS,2020,354:19.
APA Xie, Lei.,Tao, Xiangyuan.,Wang, Rucheng.,Wu, Fuyuan.,Liu, Chen.,...&Zhang, Rongqing.(2020).Highly fractionated leucogranites in the eastern Himalayan Cuonadong dome and related magmatic Be-Nb-Ta and hydrothermal Be-W-Sn mineralization.LITHOS,354,19.
MLA Xie, Lei,et al."Highly fractionated leucogranites in the eastern Himalayan Cuonadong dome and related magmatic Be-Nb-Ta and hydrothermal Be-W-Sn mineralization".LITHOS 354(2020):19.

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来源：地质与地球物理研究所

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