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Mantle peridotites of ophiolites rarely preserve reliable records of paleo-oceanic lithospheric mantle

文献类型：期刊论文

作者Su, Ben-Xun5,6; Pan, Qi-Qi1,5; Xiao, Yan1; Jing, Jie-Jun2; Robinson, Paul T.6; Uysal, Ibrahim3; Liu, Xia5,6; Liu, Jian-Guo4,6
刊名EARTH-SCIENCE REVIEWS
出版日期2023-09-01
卷号244页码:22
ISSN号0012-8252
关键词Ophiolite Peridotite Partial melting Metasomatism Oceanic lithospheric mantle
DOI10.1016/j.earscirev.2023.104544
英文摘要Mantle peridotites of ophiolites have traditionally been interpreted as fragments of residual oceanic lithospheric mantle depleted by partial melting. However, recent petrological, geochemical and isotopic data suggest that this hypothesis needs to be reconsidered. Spinel grains in ophiolitic mantle peridotites, previously believed to record melt extraction, exhibit significant compositional variations that are incompatible with partial melting. These grains occur mostly as interstitial, anhedral crystals associated with clinopyroxene or as inclusions in silicates; they commonly also contain a variety of inclusions. Their elemental compositions are highly variable at both intra- and inter-grain, as well as intra- and inter-sample scales. In addition to association with spinel, interstitial clinopyroxene is also widespread in ophiolitic mantle peridotites. Individual clinopyroxene grains show positive correlations between Al2O3 and Cr2O3 contents, akin to those observed in orthopyroxene, which deviate from partial melting trends. Reactive and replacive features are well-developed in orthopyroxene grains. Olivine has anomalously variable Li isotope compositions and generally heavier Fe and Cr isotope compositions than coexisting spinel, contrary to theoretical predictions and results from mantle peridotite xenoliths. Additionally, aggregates of olivine, orthopyroxene, clinopyroxene, spinel and amphibole are also commonly observed in many samples. All of these characteristics suggest significant post-crystallization modifications of the constituent minerals in the mantle peridotites of ophiolites. Amphibole, a widespread hydrous mineral in mantle peridotites of ophiolites, serves as robust evidence of the past presence of hydrous melts/fluids. It typically exhibits variable compositions that can be distinguished from grains in other lithologies or different tectonic settings. These melts/ fluids are most likely related to the intrusion of dunite, chromitite, clinopyroxenite, and wehrlite bodies, which may form layered or podiform occurrences in mantle lherzolites and harzburgites. The mantle peridotites can be interlayered with dunites at scales ranging from several centimeters to hundreds of meters in length and several centimeters to several meters in thickness. Drill cores of ophiolitic peridotites reveal a wide range of lithologies and extensive geochemical heterogeneity in the mantle sequences of investigated ophiolites. The modified geochemical signatures found in minerals and bulk-rock samples go far beyond what could be produced by partial melting alone; some peridotites may have even formed through the direct accumulation of crystals from melts. These active melts/fluids are inferred to be hydrous and enriched in Mg and Ca. They not only introduced exotic components to metasomatize the mantle peridotites but also facilitated compositional exchange between various lithologies and both chromite and silicates. The possible origins for the melts/fluids are proposed: dehydration and melting of subducting slabs involving melting of the mantle wedge, and the release of hydrous melts/fluids either from chromitite bodies or metamorphic sole rocks. As a result, the mantle peridotites of ophiolites can no longer be considered as paleo-oceanic lithospheric mantle and should not be used to identify paleo-oceans' reconstructions and to constrain global tectonic processes.
WOS关键词SW TURKEY IMPLICATIONS ; MELT-ROCK INTERACTION ; IRON ISOTOPIC FRACTIONATION ; POZANTI-KARSANTI OPHIOLITE ; TRACE-ELEMENT GEOCHEMISTRY ; THETFORD MINES OPHIOLITE ; CR PODIFORM CHROMITITES ; ZANGBO SUTURE ZONE ; SUB-ARC MANTLE ; OMAN OPHIOLITE
资助项目Second Tibetan Plateau Scientific Expedition and Research Program (STEP)[2019QZKK0801] ; National Natural Science Foundation of China[91755205] ; Open Fund Project, State Key Laboratory of Lithospheric Evolution[SKL-K202202] ; Youth Innovation Promotion Association, Chinese Academy of Sciences
WOS研究方向Geology
语种英语
出版者ELSEVIER
WOS记录号WOS:001106730900001
资助机构Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; 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, State Key Laboratory of Lithospheric Evolution ; Open Fund Project, State Key Laboratory of Lithospheric Evolution ; Open Fund Project, State Key Laboratory of Lithospheric Evolution ; Open Fund Project, State Key Laboratory of Lithospheric Evolution ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; 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, State Key Laboratory of Lithospheric Evolution ; Open Fund Project, State Key Laboratory of Lithospheric Evolution ; Open Fund Project, State Key Laboratory of Lithospheric Evolution ; Open Fund Project, State Key Laboratory of Lithospheric Evolution ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; 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, State Key Laboratory of Lithospheric Evolution ; Open Fund Project, State Key Laboratory of Lithospheric Evolution ; Open Fund Project, State Key Laboratory of Lithospheric Evolution ; Open Fund Project, State Key Laboratory of Lithospheric Evolution ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; 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, State Key Laboratory of Lithospheric Evolution ; Open Fund Project, State Key Laboratory of Lithospheric Evolution ; Open Fund Project, State Key Laboratory of Lithospheric Evolution ; Open Fund Project, State Key Laboratory of Lithospheric Evolution ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences
源URL[http://ir.iggcas.ac.cn/handle/132A11/110639]  
专题地质与地球物理研究所_中国科学院矿产资源研究重点实验室
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Su, Ben-Xun
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Vrije Univ Amsterdam, Fac Sci, Dept Earth Sci, De Boelelaan 1085, NL-1081 HV Amsterdam, Netherlands
3.Karadeniz Tech Univ, Dept Geol Engn, TR-61080 Trabzon, Turkiye
4.Shandong Univ Technol, Sch Resources & Environm Engn, Zibo 255000, Peoples R China
5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
6.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Su, Ben-Xun,Pan, Qi-Qi,Xiao, Yan,et al. Mantle peridotites of ophiolites rarely preserve reliable records of paleo-oceanic lithospheric mantle[J]. EARTH-SCIENCE REVIEWS,2023,244:22.
APA Su, Ben-Xun.,Pan, Qi-Qi.,Xiao, Yan.,Jing, Jie-Jun.,Robinson, Paul T..,...&Liu, Jian-Guo.(2023).Mantle peridotites of ophiolites rarely preserve reliable records of paleo-oceanic lithospheric mantle.EARTH-SCIENCE REVIEWS,244,22.
MLA Su, Ben-Xun,et al."Mantle peridotites of ophiolites rarely preserve reliable records of paleo-oceanic lithospheric mantle".EARTH-SCIENCE REVIEWS 244(2023):22.

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来源：地质与地球物理研究所

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