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Early Cretaceous bimodal magmatism in the eastern Tethyan Himalayas, Tibet: Indicative of records on precursory continental rifting and initial breakup of eastern Gondwana
Tian, Yihong1; Gong, Junfeng1; Chen, Hanlin1; Guo, Lishuang2; Xu, Qinqin3; Chen, Lin4; Lin, Xiubin1; Cheng, Xiaogan1; Yang, Rong1; Zhao, Lei3; Yang, Shufeng1
2019
Source PublicationLITHOS
ISSN0024-4937
Volume324Pages:699-715
AbstractIn this study, we report a bimodal magmatic suite of gabbroic-granitic rocks in the Cuona area of the eastern Tethyan Himalayas, which is related to the rifting event between Greater India and western Australia in eastern Gondwana. Whole-rock major and trace elements, SHRIMP zircon U-Pb geochronology and Hf isotopic analysis were conducted to reveal the petrogenesis of the bimodal suite and through this to explore the tectonic implications. Our main findings include the following. First, the gabbros and granites were emplaced synchronously at 140-137 Ma, considering the field relationships they comprise a bimodal suite. Second, the gabbros are enriched in light rare-earth-elements (LREE), depleted in heavy rare-earth-elements (HREE) with slight Eu anomalies, and have sHf(t) values of +0.04 - +8.30, which as a whole, suggests that they were derived from an ocean island basalt (OIB)-like mantle source. Third, the granites display low MgO, CaO, and Al2O3, marked enrichment in LREE, highly refracted HREE with strongly negative Eu anomalies and epsilon Hf(t) values of -2.01 to +1.71, all of which ultimately gives the characteristics of A1-type granites. Based on these observations, we propose that the bimodal suite is formed in a continental rift. Specifically, the gabbros originated from the mantle plume, whereas the granites derived from the upper crust with garnet-bearing metapelite. This rifting event initiated at 140 Ma, which places bounds on the initial breakup of eastern Gondwana, specifically the separation of Greater India from western Australia. (C) 2018 Elsevier B.V. All rights reserved.
KeywordBimodal magmatism Tethyan Himalayas Zircon U-Pb geochronology Hf isotope Gondwana breakup
DOI10.1016/j.lithos.2018.12.001
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National S&T Major Project od China ; National S&T Major Project od China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National S&T Major Project od China ; National S&T Major Project od China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National S&T Major Project od China ; National S&T Major Project od China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National S&T Major Project od China ; National S&T Major Project od China
WOS KeywordLARGE IGNEOUS PROVINCE ; PB ZIRCON GEOCHRONOLOGY ; A-TYPE GRANITOIDS ; GEOCHEMICAL CHARACTERISTICS ; FRACTIONAL CRYSTALLIZATION ; VOLCANIC-ROCKS ; SOUTH CHINA ; SEDIMENTARY HISTORY ; KERGUELEN PLUME ; NORTHWEST CHINA
Language英语
Funding ProjectNational Natural Science Foundation of China[41472182] ; National Natural Science Foundation of China[41472181] ; National Natural Science Foundation of China[41602210] ; National S&T Major Project od China[2017ZX05008-001] ; National S&T Major Project od China[2017ZX05003-001]
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National S&T Major Project od China ; National S&T Major Project od China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National S&T Major Project od China ; National S&T Major Project od China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National S&T Major Project od China ; National S&T Major Project od China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National S&T Major Project od China ; National S&T Major Project od China
WOS Research AreaGeochemistry & Geophysics ; Mineralogy
WOS SubjectGeochemistry & Geophysics ; Mineralogy
WOS IDWOS:000457819800045
PublisherELSEVIER SCIENCE BV
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/90533
Collection中国科学院地质与地球物理研究所
Corresponding AuthorGong, Junfeng
Affiliation1.Zhejiang Univ, Sch Earth Sci, Hangzhou 310027, Zhejiang, Peoples R China
2.CEA, Inst Crustal Dynam, Key Lab Crustal Dynam, Beijing 100085, Peoples R China
3.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
Recommended Citation
GB/T 7714
Tian, Yihong,Gong, Junfeng,Chen, Hanlin,et al. Early Cretaceous bimodal magmatism in the eastern Tethyan Himalayas, Tibet: Indicative of records on precursory continental rifting and initial breakup of eastern Gondwana[J]. LITHOS,2019,324:699-715.
APA Tian, Yihong.,Gong, Junfeng.,Chen, Hanlin.,Guo, Lishuang.,Xu, Qinqin.,...&Yang, Shufeng.(2019).Early Cretaceous bimodal magmatism in the eastern Tethyan Himalayas, Tibet: Indicative of records on precursory continental rifting and initial breakup of eastern Gondwana.LITHOS,324,699-715.
MLA Tian, Yihong,et al."Early Cretaceous bimodal magmatism in the eastern Tethyan Himalayas, Tibet: Indicative of records on precursory continental rifting and initial breakup of eastern Gondwana".LITHOS 324(2019):699-715.
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