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Geochemical constraints on subduction-related mantle metasomatism of the Tiebaghi ophiolitic lherzolite in New Caledonia

文献类型：期刊论文

作者Cai, Pengjie6,7; Lian, Dongyang7; Aitchison, Jonathan C.5; Cluzel, Dominique4; Zhou, Renjie5; Rui, Huichao3; Bo, Rongzong7; Ma, Haitao7; Yang, Jingsui7; Masoud, Ahmed E.1,2
刊名LITHOS
出版日期2025-03-01
卷号496页码:15
关键词Subduction initiation Calcium isotopes Platinum-group elements Mantle metasomatism
ISSN号0024-4937
DOI10.1016/j.lithos.2025.107948
英文摘要The geochemical evolution of mantle peridotite during subduction initiation (SI) remains an issue in geosciences. This study presents geochemical and Ca isotopic data for Tiebaghi lherzolites from the New Caledonia ophiolite to constrain their petrogenesis and the nature of melt-rock interaction during the nascent stage of subduction. Petrographic and geochemical analyses reveal that the Tiebaghi lherzolites are characterized by olivine with Fo contents of 89.5-90.7, high-Al Spinel (Cr# = 45.1-50.9; Al2O3 = 24.99-29.29 wt%), orthopyroxene with high CaO (0.87-2.47 wt%) and Al2O3 (2.19-4.91 wt%) coupled with relatively low Mg# (89.4-91.3), and clinopyroxene with high Al2O3 (2.72-6.44 wt%) and relatively low Mg# (90.4-92.5). Lherzolites from northwestern New Caledonia are thought to have escaped the suprasubduction re-melting, resulting in the formation of the highly depleted harzburgites that form the bulk of the ophiolite. They display a restricted range of 5 44/40 Ca values (0.75-0.93 parts per thousand), which are lower than the proposed 5 44/40 Ca value of Earth's upper mantle. This isotopic signature is interpreted to reflect interaction with a low 5 44/40 Ca metasomatic agent, possibly a carbonate-rich melt derived from the subducting slab. These findings suggest that the Tiebaghi lherzolites preserve a geochemical record of the early stages of melt-rock interaction during subduction initiation, emphasizing the role of carbonate melt metasomatism in altering the composition of the nascent mantle wedge.
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:001409741600001
源URL[http://ir.gig.ac.cn/handle/344008/82621]  
专题中国科学院矿物学与成矿学重点实验室
通讯作者Lian, Dongyang
作者单位1.Nanjing Hongchuang Geol Explorat Technol Serv Co L, Nanjing 210033, Peoples R China
2.Tanta Univ, Fac Sci, Geol Dept, Tanta 31527, Egypt
3.Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Mineral & Metallogeny, Guangdong Prov Key Lab Mineral Phys & Mat, Guangzhou 510640, Peoples R China
4.Univ Nouvelle Caledonie, Inst Exact & Appl Sci, BP R4, Nouvelle 98851, New Caledonia
5.Univ Queensland, Sch Environm, St Lucia, Qld 4072, Australia
6.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China
7.Nanjing Univ, Sch Earth Sci & Engn, State Key Lab Mineral Deposits Res, IMM, Nanjing 210023, Peoples R China
推荐引用方式
GB/T 7714		 Cai, Pengjie,Lian, Dongyang,Aitchison, Jonathan C.,et al. Geochemical constraints on subduction-related mantle metasomatism of the Tiebaghi ophiolitic lherzolite in New Caledonia[J]. LITHOS,2025,496:15.
APA Cai, Pengjie.,Lian, Dongyang.,Aitchison, Jonathan C..,Cluzel, Dominique.,Zhou, Renjie.,...&Masoud, Ahmed E..(2025).Geochemical constraints on subduction-related mantle metasomatism of the Tiebaghi ophiolitic lherzolite in New Caledonia.LITHOS,496,15.
MLA Cai, Pengjie,et al."Geochemical constraints on subduction-related mantle metasomatism of the Tiebaghi ophiolitic lherzolite in New Caledonia".LITHOS 496(2025):15.

入库方式： OAI收割

来源：广州地球化学研究所

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