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Testing oceanic crust-mantle decoupling by Sr-Nd-Hf-Os isotopes of Neo-Tethyan ophiolites

文献类型：期刊论文

作者Liu, Tong6; Wu, Fu-Yuan5,6; Liu, Chuan-Zhou1,5,6; Eyuboglu, Yener4; Zhu, Di-Cheng1,2,3; Zhang, Chang6; Ji, Wen-Bin6; Xu, Yang6; Zhang, Zhen-Yu5,6
刊名LITHOS
出版日期2020-12-01
卷号376页码:12
关键词Oceanic crust-mantle decoupling Mantle heterogeneity Ultra-depleted mantle Kizildag ophiolite Xigaze ophiolite Sr-Nd-Hf-Os isotopes
ISSN号0024-4937
DOI10.1016/j.lithos.2020.105757
英文摘要Oceanic crust and the mantle are thought to have identical Sr-Nd-Hf-Os isotopic compositions. However, there is increasing evidence of isotopic differences between the two units, suggesting the existence of oceanic crust-mantle decoupling. Here we present updated whole-rock and mineral Sr-Nd-Hf-Os isotope data for the Kizildag (southeast Turkey) and Xigaze (south Tibet, China) Neo-Tethyan ophiolites to test if oceanic crust-mantle decoupling characterizes these ophiolites. Mantle peridotites from the Kizildag ophiolite have large variations in clinopyroxene and orthopyroxene Hf isotopic compositions (epsilon(Hf)(t) = -27.7 to +20.6) and unradiogenic Os isotope ratios (Os-187/Os-188 = 0.11853-0.12720). These mantle peridotites have experienced ancient (up to similar to 1.6 Ga) melt depletion events, as evidenced by their old Re depletion ages (TRD = 1632-357 Ma), although Hf isotopes have been locally reset by recent melt re-fertilization, which likely occurred in a forearc basin setting. Mantle peridotites fromthe Xigaze ophiolitemainly have DMM (depleted mid-ocean ridge basaltmantle)-like to ultra-depleted clinopyroxene Hf isotopic compositions (epsilon(Hf(t))=+9.1 to+29.8 for 17 out of 19 analyses), which were extensively overprinted by silicate melt percolation. However, the Os isotopic compositions of the Xigaze mantle peridotites are similar to those of the Kizildag ophiolite, again suggestive of ancient melt extraction long before the Early Cretaceous formation of this oceanic crust. These ancient and ultra-depleted mantle domains are not uncommon in modern oceanic lithosphere, forearc basins and ophiolites, and are less dense than the fertile mantle, and also are too refractory to contribute to the recent generation of oceanic crust. Sampling bias is unavoidable when comparing the oceanic crust and its underlying lithospheric mantle. As such, the oceanic crust alone cannot be used to estimate the isotopic composition of its entire mantle source. (C) 2020 Elsevier B.V. All rights reserved.
WOS关键词XIGAZE OPHIOLITE ; SUBDUCTION INITIATION ; MELT EXTRACTION ; ABYSSAL PERIDOTITES ; TETHYAN OPHIOLITES ; KIZILDAG OPHIOLITE ; DEPLETED MANTLE ; U-PB ; RIDGE ; ANCIENT
资助项目Open Fund Project of the State Key Laboratory of Lithospheric Evolution[201707] ; Key Research Program of Frontier Sciences from CAS[QYZDB-SSW-DQC032] ; Major Research Project on Tethys Geodynamic System from NSFC[91755000] ; National Natural Science Foundation of China[41673038] ; National Natural Science Foundation of China[41802062]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000580897000022
出版者ELSEVIER
资助机构Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; Major Research Project on Tethys Geodynamic System from NSFC ; Major Research Project on Tethys Geodynamic System from NSFC ; Major Research Project on Tethys Geodynamic System from NSFC ; Major Research Project on Tethys Geodynamic System from NSFC ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; Major Research Project on Tethys Geodynamic System from NSFC ; Major Research Project on Tethys Geodynamic System from NSFC ; Major Research Project on Tethys Geodynamic System from NSFC ; Major Research Project on Tethys Geodynamic System from NSFC ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; Major Research Project on Tethys Geodynamic System from NSFC ; Major Research Project on Tethys Geodynamic System from NSFC ; Major Research Project on Tethys Geodynamic System from NSFC ; Major Research Project on Tethys Geodynamic System from NSFC ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; Key Research Program of Frontier Sciences from CAS ; Major Research Project on Tethys Geodynamic System from NSFC ; Major Research Project on Tethys Geodynamic System from NSFC ; Major Research Project on Tethys Geodynamic System from NSFC ; Major Research Project on Tethys Geodynamic System from NSFC ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/98719]  
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Liu, Tong
作者单位1.Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
2.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China
3.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Beijing 100083, Peoples R China
4.Karadeniz Tech Univ, Dept Geol Engn, TR-61080 Trabzon, Turkey
5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
6.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Liu, Tong,Wu, Fu-Yuan,Liu, Chuan-Zhou,et al. Testing oceanic crust-mantle decoupling by Sr-Nd-Hf-Os isotopes of Neo-Tethyan ophiolites[J]. LITHOS,2020,376:12.
APA Liu, Tong.,Wu, Fu-Yuan.,Liu, Chuan-Zhou.,Eyuboglu, Yener.,Zhu, Di-Cheng.,...&Zhang, Zhen-Yu.(2020).Testing oceanic crust-mantle decoupling by Sr-Nd-Hf-Os isotopes of Neo-Tethyan ophiolites.LITHOS,376,12.
MLA Liu, Tong,et al."Testing oceanic crust-mantle decoupling by Sr-Nd-Hf-Os isotopes of Neo-Tethyan ophiolites".LITHOS 376(2020):12.

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来源：地质与地球物理研究所

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