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Subduction re-initiation at dying ridge of Neo-Tethys: Insights from mafic and metamafic rocks in Lhaze ophiolitic melange, Yarlung-Tsangbo Suture Zone

文献类型：期刊论文

作者Zhang, Chang1; Liu, Chuan-Zhou1,2; Xu, Yang3; Ji, Wen-Bin1; Wang, Jia-Min1; Wu, Fu-Yuan1,2; Liu, Tong1; Zhang, Zhen-Yu1,4; Zhang, Wei-Qi1,4
刊名EARTH AND PLANETARY SCIENCE LETTERS
出版日期2019-10-01
卷号523页码:14
关键词Yarlung-Tsangbo ophiolites Neo-Tethys metamorphic sole subduction re-initiation
ISSN号0012-821X
DOI10.1016/j.epsl.2019.07.009
英文摘要Ophiolitic melanges provide critical information on the history of subduction and metamorphism and, thus, on the evolution of ancient oceans. Blocks of mafic rocks, garnet-clinopyroxenites and amphibolites have recently been discovered in the Lhaze ophiolitic melange of the Yarlung-Tsangbo Suture Zone, Southern Tibet. These blocks represent different origins from the Neo-Tethys. The unmetamorphosed MORB-type mafic rocks are considered as the oceanic crusts formed during the spreading of the dying mid-ocean-ridges. The garnet-clinopyroxenites and amphibolites are interpreted to be parts of dismembered metamorphic soles beneath the lowest part of the ophiolites. In spite of different mineral assemblages and metamorphic facies, both clinopyroxenites and amphibolites show strong affinities to the oceanic crust rocks, as evidenced by their geochemical and isotopic data. In addition, the inherited igneous zircon U-Pb results indicate that the protolith ages of these metamorphic rocks are 124-125 Ma, which are coeval with the formation ages of oceanic crusts and the metamorphic ages of amphibolites within the YTSZ. Geothermobarometry calculations indicate that these rocks went through metamorphism to peak conditions of granulite-facies in excess of 900 degrees C at minimum pressure of 9 kbar for garnet-clinopyroxenites and of high-amphibolite facies of 650 degrees C at 7.5 kbar for amphibolites, corresponding to a quite high geothermal gradient (25-30 degrees C/km). Such a high geotherm implies that the lithospheric mantle and the subducted oceanic crusts were nascent and still hot when the mantle obducted onto the ocean crust of the Neo-Tethys. A scenario of subduction re-initiation at the dying mid-ocean-ridge close to the Eurasian continental margin is proposed to reveal the evolution of the Neo-Tethys and to provide new insights into the mechanism of formation of ophiolites and metamorphic soles worldwide. (C) 2019 Elsevier B.V. All rights reserved.
WOS关键词XIGAZE FORE-ARC ; METAMORPHIC SOLE ; GARNET AMPHIBOLITES ; SEMAIL OPHIOLITE ; TIBET PROVENANCE ; TRACE-ELEMENT ; LAZI REGION ; SW TIBET ; MANTLE ; CONSTRAINTS
资助项目National Natural Science Foundation of China[41802065] ; National Natural Science Foundation of China[41673038] ; China Postdoctoral Science Foundation[2018M631569] ; China Scholarship Council[201804910292]
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000482521000010
出版者ELSEVIER
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council
源URL[http://ir.iggcas.ac.cn/handle/132A11/93564]  
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, Chang; Liu, Chuan-Zhou
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
3.Minist Nat Resources, Key Lab Marine Sedimentol & Environm Geol, Inst Oceanog 1, Qingdao 266061, Shandong, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Zhang, Chang,Liu, Chuan-Zhou,Xu, Yang,et al. Subduction re-initiation at dying ridge of Neo-Tethys: Insights from mafic and metamafic rocks in Lhaze ophiolitic melange, Yarlung-Tsangbo Suture Zone[J]. EARTH AND PLANETARY SCIENCE LETTERS,2019,523:14.
APA Zhang, Chang.,Liu, Chuan-Zhou.,Xu, Yang.,Ji, Wen-Bin.,Wang, Jia-Min.,...&Zhang, Wei-Qi.(2019).Subduction re-initiation at dying ridge of Neo-Tethys: Insights from mafic and metamafic rocks in Lhaze ophiolitic melange, Yarlung-Tsangbo Suture Zone.EARTH AND PLANETARY SCIENCE LETTERS,523,14.
MLA Zhang, Chang,et al."Subduction re-initiation at dying ridge of Neo-Tethys: Insights from mafic and metamafic rocks in Lhaze ophiolitic melange, Yarlung-Tsangbo Suture Zone".EARTH AND PLANETARY SCIENCE LETTERS 523(2019):14.

入库方式： OAI收割

来源：地质与地球物理研究所

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