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Reconsideration of Neo-Tethys evolution constrained from the nature of the Dazhuqu ophiolitic mantle, southern Tibet
Liu, Tong1,2; Wu, Fu-Yuan1,2,3; Liu, Chuan-Zhou1,3,4; Zhang, Chang1; Ji, Wen-Bin1; Xu, Yang1
2019-03-01
Source PublicationCONTRIBUTIONS TO MINERALOGY AND PETROLOGY
ISSN0010-7999
Volume174Issue:3Pages:23
AbstractThe nature (i.e., sub-oceanic, sub-arc or sub-continental) of ophiolitic mantle peridotites from the eastern Neo-Tethyan domain in southern Tibet has been hotly debated. This uncertainty limits our understanding of the history and evolution of the eastern Neo-Tethys Ocean. Here we present petrological, geochemical and Re-Os isotopic data for the mantle peridotites from the Dazhuqu ophiolite in the central segment of the Yarlung Zangbo suture zone, southern Tibet. Samples collected include both spinel lherzolites and spinel harzburgites. The lherzolites have spinel Cr# [Cr/(Cr+Al), similar to 0.3-0.4] comparable to those of typical abyssal peridotites. In contrast, the harzburgites have spinel Cr# (similar to 0.3-0.7) overlapping with the ranges of both abyssal and fore-arc peridotites; two samples have spinel Cr# higher than 0.6, which is probably ascribed to intense melt-rock interactions. Clinopyroxene trace element modeling indicates that the Dazhuqu mantle peridotites have experienced 0-6% garnet-facies melting followed by 10-18% melting in the spinel stability field. This is similar to the degree of garnet-facies melting inferred for many abyssal peridotites and implies deep initial melting (>85km), which distinguishes the Dazhuqu mantle peridotites from fore-arc peridotites (commonly<80km in origin). The Dazhuqu peridotites have unradiogenic Os-187/Os-188 of 0.11836-0.12922, which are commonly lower than the recommended value of primitive upper mantle (PUM). All but one samples yield relatively younger Re depletion ages (T-RD = 0.06-0.81Ga) with respect to the only one sample having an older T-RD age of 1.66Ga. Re-Os isotopes and highly siderophile element (HSE) compositions of the Dazhuqu peridotites are similar to those of abyssal peridotites and the Oman southern massifs but are distinct from non-cratonic sub-continental lithospheric mantle (SCLM) xenoliths and sub-arc mantle. We emphasize the similarity between the Dazhuqu and Oman ophiolites, both representing Neo-Tethyan oceanic lithosphere and implying ridge-trench collision.
KeywordNeo-Tethys Ocean Sub-oceanic mantle Re-Os isotope Mantle peridotite Dazhuqu ophiolite Yarlung Zangbo suture zone
DOI10.1007/s00410-019-1557-7
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; Open Fund Project of State Key Laboratory of Lithospheric Evolution
WOS KeywordYARLUNG-ZANGBO SUTURE ; HIGHLY SIDEROPHILE ELEMENT ; SUBDUCTION-ACCRETION PROCESSES ; OCEANIC UPPER-MANTLE ; MELT-ROCK REACTION ; MARIANA FORE-ARC ; ABYSSAL PERIDOTITES ; XIGAZE OPHIOLITE ; OS-ISOTOPE ; TECTONIC EVOLUTION
Language英语
Funding ProjectNational Natural Science Foundation of China[41673038] ; National Natural Science Foundation of China[41521062] ; Key Research Program of Frontier Sciences from CAS[QYZDB-SSW-DQC032] ; Open Fund Project of State Key Laboratory of Lithospheric Evolution[201707]
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; Open Fund Project of State Key Laboratory of Lithospheric Evolution ; Open Fund Project of State Key Laboratory of Lithospheric Evolution
WOS Research AreaGeochemistry & Geophysics ; Mineralogy
WOS SubjectGeochemistry & Geophysics ; Mineralogy
WOS IDWOS:000460545900001
PublisherSPRINGER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/90878
Collection岩石圈演化国家重点实验室
Corresponding AuthorLiu, Tong
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
Recommended Citation
GB/T 7714
Liu, Tong,Wu, Fu-Yuan,Liu, Chuan-Zhou,et al. Reconsideration of Neo-Tethys evolution constrained from the nature of the Dazhuqu ophiolitic mantle, southern Tibet[J]. CONTRIBUTIONS TO MINERALOGY AND PETROLOGY,2019,174(3):23.
APA Liu, Tong,Wu, Fu-Yuan,Liu, Chuan-Zhou,Zhang, Chang,Ji, Wen-Bin,&Xu, Yang.(2019).Reconsideration of Neo-Tethys evolution constrained from the nature of the Dazhuqu ophiolitic mantle, southern Tibet.CONTRIBUTIONS TO MINERALOGY AND PETROLOGY,174(3),23.
MLA Liu, Tong,et al."Reconsideration of Neo-Tethys evolution constrained from the nature of the Dazhuqu ophiolitic mantle, southern Tibet".CONTRIBUTIONS TO MINERALOGY AND PETROLOGY 174.3(2019):23.
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