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Cretaceous (similar to 100 Ma) high-silica granites in the Gajin area, Central Tibet: Petrogenesis and implications for collision between the Lhasa and Qiangtang Terranes

文献类型：期刊论文

作者Yang, Zong-Yong1,2; Wang, Qiang1,2,3; Zhang, Chunfu4; Yang, Jin-Hui5; Ma, Lin1; Wang, Jun1,2; Sun, Peng1,2; Qi, Yue1,2
刊名LITHOS
出版日期2019
卷号324页码:402-417
关键词High-silica granites Magmatic luil Continental collision Cretaceous Tibet
ISSN号0024-4937
DOI10.1016/j.lithos.2018.11.011
英文摘要High-silica granites that occur as isolated plutons are widely distributed in collisional orogenic belts and are considered a hallmark of continental collision processes. The late Mesozoic collision between the Lhasa and Qiangtang Terranes along the Bangong-Nujiang Suture Zone was key event in the evolution of the Tibetan Plateau; however, the timing of this collision remains debated. Here, we report the ages and geochemical characteristics of granites from the Gajin area in the north-central Lhasa Terrane, central Tibet. Zircon U-Pb dating reveals that the Gajin granites formed at similar to 100 Ma. These granites exhibit uniformly high SiO2 contents (74.978.4 wt%), are weakly peraluminous compositions, and have high K2O, moderate Na2O and Al2O3 , and low Fe2OT/3, MgO, and CaO contents. They are characterized by enrichments in Rb, Cs, and U, and by depletions in Zr, Hf, Nb, and Ti. These characteristics, in combination with high Rb/Sr ratios and pronounced negative Eu anomalies, indicate that the Gajin granites are highly fractionated rocks. The granites have enriched whole-rock Nd (epsilon(Nd) [t] = -4.3 to -2.9) and relatively depleted and slightly variable zircon Hf (epsilon(Hf)[t] = -1.0 to +5.5) isotope compositions. The Gajin granites were probably generated by high degrees of crystal fractionations of magma produced by partial melting of mature crustal sources. The Cretaceous magmatic rocks in the north-central Lhasa Terrane record a magmatic lull between similar to 100 and 85 Ma, which corresponds to a transition in both geochemical composition (e.g., Hf-Nd isotopes) and rock association at similar to 100 Ma. Combining the above characteristics with the development of a regional angular unconformity around the time of the formation of the granites, we suggest that the initial continental collision between the Lhasa and Qiangtang Terranes probably occurred between 110 and 90 Ma. Therefore, the similar to 100 Ma high-silica granites in the Gajin area were formed during the continuing continental convergence that followed the initial collision between the Lhasa and Qiangtang Terranes. The generation of discrete and monotonous high silica granites may constitute evidence for a significant tectonothermal transition in evolution of the continental crust. (C) 2018 Elsevier B.V. All rights reserved.
WOS关键词MESOZOIC TECTONIC EVOLUTION ; BANGONG-NUJIANG SUTURE ; FLAT-SLAB SUBDUCTION ; A-TYPE GRANITES ; SOUTHERN QIANGTANG ; CONTINENTAL-CRUST ; INTRUSIVE ROCKS ; NATURAL ZIRCON ; TRACE-ELEMENT ; TETHYAN OCEAN
资助项目National Key R & D Program of China[2016YFC0600407] ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences[XDA2007030402] ; Key Program of the Chinese Academy of Sciences[QYZDJ-SSW-DQC026] ; National Natural Science Foundation of China[41630208] ; Key Science Program of Guangzhou City[201707020032] ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 Project)[135TP201601]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000457819800027
出版者ELSEVIER SCIENCE BV
资助机构National Key R & D Program of China ; National Key R & D Program of China ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; Key Program of the Chinese Academy of Sciences ; Key Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Science Program of Guangzhou City ; Key Science Program of Guangzhou City ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 Project) ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 Project) ; National Key R & D Program of China ; National Key R & D Program of China ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; Key Program of the Chinese Academy of Sciences ; Key Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Science Program of Guangzhou City ; Key Science Program of Guangzhou City ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 Project) ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 Project) ; National Key R & D Program of China ; National Key R & D Program of China ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; Key Program of the Chinese Academy of Sciences ; Key Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Science Program of Guangzhou City ; Key Science Program of Guangzhou City ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 Project) ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 Project) ; National Key R & D Program of China ; National Key R & D Program of China ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; Strategic Priority Research Program (A) of the Chinese Academy of Sciences ; Key Program of the Chinese Academy of Sciences ; Key Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Science Program of Guangzhou City ; Key Science Program of Guangzhou City ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 Project) ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 Project)
源URL[http://ir.iggcas.ac.cn/handle/132A11/90535]  
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.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China
2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
3.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
4.Ft Hays State Univ, Dept Geosci, Hays, KS 67601 USA
5.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Yang, Zong-Yong,Wang, Qiang,Zhang, Chunfu,et al. Cretaceous (similar to 100 Ma) high-silica granites in the Gajin area, Central Tibet: Petrogenesis and implications for collision between the Lhasa and Qiangtang Terranes[J]. LITHOS,2019,324:402-417.
APA Yang, Zong-Yong.,Wang, Qiang.,Zhang, Chunfu.,Yang, Jin-Hui.,Ma, Lin.,...&Qi, Yue.(2019).Cretaceous (similar to 100 Ma) high-silica granites in the Gajin area, Central Tibet: Petrogenesis and implications for collision between the Lhasa and Qiangtang Terranes.LITHOS,324,402-417.
MLA Yang, Zong-Yong,et al."Cretaceous (similar to 100 Ma) high-silica granites in the Gajin area, Central Tibet: Petrogenesis and implications for collision between the Lhasa and Qiangtang Terranes".LITHOS 324(2019):402-417.

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