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Petrogenesis of Late Early Cretaceous high-silica granites from the Bangong-Nujiang suture zone, Central Tibet

文献类型：期刊论文

作者Hu, Wan-Long1,3; Wang, Qiang1,3,4; Yang, Jin-Hui2; Tang, Gong-Jian3,4; Ma, Lin3; Yang, Zong-Yong3,5; Qi, Yue3; Sun, Peng3
刊名LITHOS
出版日期2021-11-15
卷号402页码:13
ISSN号0024-4937
关键词Late Early Cretaceous High-silica granite Slab breakoff Post-collisional setting Central Tibet
DOI10.1016/j.lithos.2020.105788
英文摘要High-silica granites are common in collisional orogenic belts. However, the petrogenesis of such granites and the geodynamic processes associated with their emplacement are debated. In this study, we present zircon U-Pb ages and Hf isotopes, and whole-rock geochemical and Sr-Nd isotopic compositions for biotite granites from the Jiang Co area, in the Bangong-Nujiang suture zone, central Tibet. Zircon U-Pb dating reveals that the Jiang Co granites were emplaced during the late Early Cretaceous (ca.114 Ma). These granites are characterized by high and variable SiO2 (69.7-78.2 wt%) and K2O (4.7-8.4 wt%), and low MgO (0.09-1.25 wt%) and P2O5 (< 0.1 wt%) contents. The samples are enriched in Rb, Th, U, and Pb, and depleted in Ba, Nb, Ta, Sr, Ti, and Eu. These geochemical features suggest that the Jiang Co granites underwent extensive fractional crystallization. The high and variable initial Sr-87/Sr-86 (0.7066 to 0.7095) ratios and consistent epsilon(Nd)(t) (-8.2 to -9.2) values, along with T-Nd(2DM) ages of 1.66 to 1.58 Ga, and negative to positive zircon epsilon(Hf)(t) (-7.5 to +1.8) values, imply that these granites were formed by partial melting of the mature ancient crustal materials with minor involvement of mantle materials. Along with contemporaneous magmatic activity, we suggest that the Jiang Co granites were mainly generated by crustal melting in a post-collisional setting resulting from slab breakoff after the Lhasa-Qiangtang collision, and subsequently underwent a high degree fractional crystallization. (C) 2020 Elsevier B.V. All rights reserved.
WOS关键词A-TYPE GRANITES ; NORTHERN LHASA TERRANE ; BIMODAL VOLCANIC-ROCKS ; U-PB GEOCHRONOLOGY ; I-TYPE GRANITES ; TRACE-ELEMENTS ; MAGMATIC PROCESSES ; CALC-ALKALINE ; SM-ND ; GEOCHEMICAL CHARACTERISTICS
资助项目Strategic Priority Research Program (A) of the Chinese Academy of Sciences[XDA2007030402] ; National Natural Science Foundation of China[41630208] ; National Natural Science Foundation of China[91855215] ; Second Tibetan Plateau Scientific Expedition and Research (STEP)[2019QZKK0702] ; National Key R & D Program of China[2016YFC0600407] ; Key Program of the Chinese Academy of Sciences[QYZDJ-SSW-DQC026] ; Chinese Academy of Sciences (GIGCAS 135 project)[135TP201601]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
出版者ELSEVIER
WOS记录号WOS:000712919500004
资助机构Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; National Key R & D Program of China ; National Key R & D Program of China ; Key Program of the Chinese Academy of Sciences ; Key Program of the Chinese Academy of Sciences ; Chinese Academy of Sciences (GIGCAS 135 project) ; Chinese Academy of Sciences (GIGCAS 135 project) ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; National Key R & D Program of China ; National Key R & D Program of China ; Key Program of the Chinese Academy of Sciences ; Key Program of the Chinese Academy of Sciences ; Chinese Academy of Sciences (GIGCAS 135 project) ; Chinese Academy of Sciences (GIGCAS 135 project) ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; National Key R & D Program of China ; National Key R & D Program of China ; Key Program of the Chinese Academy of Sciences ; Key Program of the Chinese Academy of Sciences ; Chinese Academy of Sciences (GIGCAS 135 project) ; Chinese Academy of Sciences (GIGCAS 135 project) ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; National Key R & D Program of China ; National Key R & D Program of China ; Key Program of the Chinese Academy of Sciences ; Key Program of the Chinese Academy of Sciences ; Chinese Academy of Sciences (GIGCAS 135 project) ; Chinese Academy of Sciences (GIGCAS 135 project)
源URL[http://ir.iggcas.ac.cn/handle/132A11/103789]  
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Wang, Qiang
作者单位1.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
3.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China
4.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
5.Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550002, Peoples R China
推荐引用方式
GB/T 7714		 Hu, Wan-Long,Wang, Qiang,Yang, Jin-Hui,et al. Petrogenesis of Late Early Cretaceous high-silica granites from the Bangong-Nujiang suture zone, Central Tibet[J]. LITHOS,2021,402:13.
APA Hu, Wan-Long.,Wang, Qiang.,Yang, Jin-Hui.,Tang, Gong-Jian.,Ma, Lin.,...&Sun, Peng.(2021).Petrogenesis of Late Early Cretaceous high-silica granites from the Bangong-Nujiang suture zone, Central Tibet.LITHOS,402,13.
MLA Hu, Wan-Long,et al."Petrogenesis of Late Early Cretaceous high-silica granites from the Bangong-Nujiang suture zone, Central Tibet".LITHOS 402(2021):13.

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来源：地质与地球物理研究所

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