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Late Triassic back-arc spreading and initial opening of the Neo-Tethyan Ocean in the northern margin of Gondwana: Evidences from Late Triassic BABB-type basalts in the Tethyan Himalaya, Southern Tibet

文献类型：期刊论文

作者Lin, Chao4; Zhang, Jinjiang4; Wang, Xiaoxian1; Putthapiban, Prinya3; Zhang, Bo4; Liu, Kai2; Huang, Tianli4
刊名LITHOS
出版日期2020-04-01
卷号358页码:16
ISSN号0024-4937
关键词Back-arc basin basalts (BABB) Neo-Tethyan Ocean Late Triassic Gondwana Southern Tibet
DOI10.1016/j.lithos.2020.105408
英文摘要The tectonic evolution of the Neo-Tethyan oceanic plate between the Indian Plate and the Lhasa Terrane is a key issue for the evolution of Gondwana and formation of the Tibetan Plateau. In this paper we report on the geochemistry, Sr-Nd isotope compositions, and zircon U-Pb dating of Late Triassic basalts from the Nieru Formation (T(3)n) in the Kampa region, southern Tibet. The basalts have relatively low contents of MgO, TiO2, and total alkalis (K2O + Na2O), and they have affinities to tholeiitic basalt. They exhibit weakly fractionated rare earth element (REE) patterns with slight depletions in LREEs and slightly negative Eu anomalies on a chondritenormalized diagram. On a primitive-mantle-normalized spider diagram, they are characterized by slight enrichments in large ion lithophile elements (LILEs) and relatively flat patterns of high field strength elements (HFSEs), except for depletions in Ba, Nb, Ta, and Ti. Their initial Sr-87/Sr-86 ratios vary from 0.718133 to 0.738977 and epsilon(Nd) (t) values are relatively depleted (4.09-5.22), similar tomid-ocean ridge basalts in the Yarlung Zangbo ophiolite. We propose the T(3)n basalts were derived from a shallow and depleted mantle source by relatively high-degree partial melting in the spinel stability field. They underwent slight crustal contamination as well as the fractional crystallization of clinopyroxene. The T(3)n basalts are similar to typical back-arc basin basalts (BABB) such as the Okinawa BABB. This indicates an extensional back-arc-basin setting along the northernmargin of Gondwana during the Late Triassic. The initial opening of the Neo-Tethyan Ocean was related to the southwards subduction of the Paleo-Tethyan oceanic plate and back-arc-basin spreading during the Late Triassic. Magmatic activity along the passive continental margin records key information on continental break-up and incipient ocean development. (C) 2020 Elsevier B.V. All rights reserved.
WOS关键词HF ISOTOPIC COMPOSITIONS ; VOLCANIC-ROCKS ; TERRANE IMPLICATIONS ; TECTONIC EVOLUTION ; CONTINENTAL-MARGIN ; CENTRAL SEGMENT ; PETROGENESIS ; GEOCHEMISTRY ; MAGMATISM ; BASIN
资助项目National Key Research and Development Project of China[2016YFC0600303] ; National Nature Science Foundation of China[41402175] ; National Nature Science Foundation of China[41602054]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
出版者ELSEVIER
WOS记录号WOS:000528204700011
资助机构National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/96218]  
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Zhang, Jinjiang
作者单位1.China Earthquake Adm, Key Lab Crustal Dynam, Inst Crustal Dynam, Beijing 100085, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
3.Mahidol Univ, Geosci Program, Kanchanaburi Campus, Kanchanaburi 71150, Thailand
4.Peking Univ, Sch Earth & Space Sci, Key Lab Orogen Belts & Crustal Evolut, Minist Educ, Beijing 100871, Peoples R China
推荐引用方式
GB/T 7714		 Lin, Chao,Zhang, Jinjiang,Wang, Xiaoxian,et al. Late Triassic back-arc spreading and initial opening of the Neo-Tethyan Ocean in the northern margin of Gondwana: Evidences from Late Triassic BABB-type basalts in the Tethyan Himalaya, Southern Tibet[J]. LITHOS,2020,358:16.
APA Lin, Chao.,Zhang, Jinjiang.,Wang, Xiaoxian.,Putthapiban, Prinya.,Zhang, Bo.,...&Huang, Tianli.(2020).Late Triassic back-arc spreading and initial opening of the Neo-Tethyan Ocean in the northern margin of Gondwana: Evidences from Late Triassic BABB-type basalts in the Tethyan Himalaya, Southern Tibet.LITHOS,358,16.
MLA Lin, Chao,et al."Late Triassic back-arc spreading and initial opening of the Neo-Tethyan Ocean in the northern margin of Gondwana: Evidences from Late Triassic BABB-type basalts in the Tethyan Himalaya, Southern Tibet".LITHOS 358(2020):16.

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来源：地质与地球物理研究所

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