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Ancient depletion signals in lherzolites from forearc region: Constraints from Lu-Hf isotope compositions
Xu, Yang1,2; Liu, Chuan-Zhou1,3,4; Lin, Wei3,4; Shi, Xue-Fa1,2
2022
Source PublicationGEOSCIENCE FRONTIERS
ISSN1674-9871
Volume13Issue:1Pages:14
AbstractThe sub-arc mantle that experienced hydrous melting is commonly characterized by refractory geochemical compositions. Nevertheless, minor lherzolites with fertile compositions have also been reported for mantle peridotites from subduction zone. The petrogenesis and mantle source of the lherzolites are still controversial. The New Caledonia ophiolite (Peridotite Nappe) has been regarded as an allochthonous body of forearc lithosphere. This is supported by refractory compositions of its dominant mantle rocks. A few isolated lherzolitic massifs have also been observed in the northern part of New Caledonia. Those lherzolites are compositionally similar to abyssal peridotites, with negligible subduction-related modification. Here, we present new comprehensive geochemical compositions, in particular highprecision Sr-Nd-Hf isotope data, for the lherzolites. The initial 176Hf/177Hf ratios display moderate correlations with sensitive indicators for the extent of melting (i.e., olivine Fo, whole-rock Mg# and Yb contents in clinopyroxene) and whole-rock initial 187Os/188Os ratios. Some samples have ancient radiogenic Hf isotopes and unradiogenic Os isotope compositions, implying the preservation of ancient depletion signals in the lherzolites. The Nd isotope compositions, together with trace elements and mineral micro-textures, suggest that the lherzolites have been overprinted by a recent melt-rock interaction event. The high equilibrium temperatures of the studied samples have been estimated by the twopyroxene REE thermometer, yielding temperatures of 1066-1315 degrees C. The lherzolites have more depleted Nd-Hf isotope compositions and higher equilibrium temperatures than the New Caledonia harzburgites. This indicates that the lherzolites may represent the residues of asthenosphere mantle trapped within the forearc region. Our studies on the New Caledonia lherzolites with ancient depletion signals suggest that ancient mantle domains in the convective mantle can be emplaced in forearc region by the upwelling of asthenosphere during the early stage of subduction initiation. (c) 2021 China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/ licenses/by-nc-nd/4.0/).
KeywordNew Caledonia ophiolite Forearc Lherzolites Sr-Nd-Hf isotopes Ancient melt depletion
DOI10.1016/j.gsf.2021.101259
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; Opening Foun-dation of the Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology ; Opening Foun-dation of the Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Opening Foun-dation of the Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology ; Opening Foun-dation of the Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Opening Foun-dation of the Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology ; Opening Foun-dation of the Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Opening Foun-dation of the Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology ; Opening Foun-dation of the Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation
WOS KeywordNEW-CALEDONIA ; TRACE-ELEMENT ; ABYSSAL PERIDOTITES ; MANTLE PERIDOTITES ; SOUTHWEST PACIFIC ; SUPRA-SUBDUCTION ; MELT EXTRACTION ; ENRICHMENT PROCESSES ; LITHOSPHERIC MANTLE ; SPINEL PERIDOTITES
Language英语
Funding ProjectNational Natural Science Foundation of China[41902061] ; Opening Foun-dation of the Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology[MGQNLM-KF201813] ; China Postdoctoral Science Foundation[2019M652292]
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; Opening Foun-dation of the Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology ; Opening Foun-dation of the Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Opening Foun-dation of the Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology ; Opening Foun-dation of the Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Opening Foun-dation of the Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology ; Opening Foun-dation of the Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Opening Foun-dation of the Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology ; Opening Foun-dation of the Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000731455900003
PublisherCHINA UNIV GEOSCIENCES, BEIJING
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/103929
Collection岩石圈演化国家重点实验室
Corresponding AuthorXu, Yang
Affiliation1.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China
2.Minist Nat Resources, Key Lab Marine Geol & Metallogeny, Inst Oceanog 1, Qingdao 266061, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Xu, Yang,Liu, Chuan-Zhou,Lin, Wei,et al. Ancient depletion signals in lherzolites from forearc region: Constraints from Lu-Hf isotope compositions[J]. GEOSCIENCE FRONTIERS,2022,13(1):14.
APA Xu, Yang,Liu, Chuan-Zhou,Lin, Wei,&Shi, Xue-Fa.(2022).Ancient depletion signals in lherzolites from forearc region: Constraints from Lu-Hf isotope compositions.GEOSCIENCE FRONTIERS,13(1),14.
MLA Xu, Yang,et al."Ancient depletion signals in lherzolites from forearc region: Constraints from Lu-Hf isotope compositions".GEOSCIENCE FRONTIERS 13.1(2022):14.
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