IGGCAS OpenIR  > 岩石圈演化国家重点实验室
The Influence of Ridge Subduction on the Geochemistry of Vanuatu Arc Magmas
Deng, Chen1,2; Jenner, Frances E.2; Wan, Bo1; Li, Ji-Lei3
2022
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
ISSN2169-9313
Volume127Issue:1Pages:23
AbstractThe effects of buoyant ridge subduction have been researched for decades. However, it remains unclear how this process influences magma chemistry. Here we use a compilation of geochemical data, well-established geochemical proxies (i.e., Ba/Nb, Th/Nb) and mantle redox modeling (i.e., V/Sc, Cu) to propose that the subduction of a ridge underneath the central portion of the Vanuatu arc causes shallow-angle subduction and the development of a slab tear. We suggest that the shallow slab pinches out the asthenospheric mantle and bulldozes ancient metasomatized lithospheric mantle from the forearc toward the main-arc. Slab-fluxed melting of this bulldozed material could account for the along-arc Sr-87/Sr-86-Nd-143/Nd-144 variations of the Vanuatu magmas. The influx of hot sub-slab material into the Vanuatu arc mantle wedge through a slab tear produces magmatism within the forearc. Modeling of V/Sc and Cu systematics suggest that the mantle source of the forearc magmas has a higher fO(2) and Cu content than the source of the main-arc and rear-arc samples. The main-arc and rear-arc mantles were metasomatized by both slab-derived fluids and melts. Whereas release of high Cu-SO2 slab-derived fluids caused oxidation and Cu enrichment of the forearc mantle. These systematics indicate a decrease in the fO(2) of slab fluxes with increasing depth-to-slab and distance-from-trench. Our findings highlight the role of ridge subduction in controlling the along-arc and across-arc variations in the chemistry of Vanuatu arc magmas. This updated geodynamic model, based on geochemistry, is consistent with recent geophysical constraints and 3D numerical modeling.
KeywordVanuatu arc shallow subduction slab tear asthenosphere upwelling forearc magmatism
DOI10.1029/2021JB022833
Funding OrganizationNSFC ; NSFC ; NSFC ; NSFC ; NERC ; NERC ; NERC ; NERC ; University of CAS ; University of CAS ; University of CAS ; University of CAS ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; NSFC ; NSFC ; NSFC ; NSFC ; NERC ; NERC ; NERC ; NERC ; University of CAS ; University of CAS ; University of CAS ; University of CAS ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; NSFC ; NSFC ; NSFC ; NSFC ; NERC ; NERC ; NERC ; NERC ; University of CAS ; University of CAS ; University of CAS ; University of CAS ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; NSFC ; NSFC ; NSFC ; NSFC ; NERC ; NERC ; NERC ; NERC ; University of CAS ; University of CAS ; University of CAS ; University of CAS ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council
WOS KeywordPAPUA-NEW-GUINEA ; PORPHYRY CU ; ISLAND-ARC ; SULFIDE SATURATION ; COPPER SYSTEMATICS ; OXIDATION-STATE ; HEBRIDES ARC ; AU DEPOSITS ; MANTLE ; VOLCANO
Language英语
Funding ProjectNSFC[41888101] ; NSFC[91855207] ; NSFC[41772056] ; NSFC[42122011] ; NERC[NE/P017045/1] ; University of CAS ; China Scholarship Council
Funding OrganizationNSFC ; NSFC ; NSFC ; NSFC ; NERC ; NERC ; NERC ; NERC ; University of CAS ; University of CAS ; University of CAS ; University of CAS ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; NSFC ; NSFC ; NSFC ; NSFC ; NERC ; NERC ; NERC ; NERC ; University of CAS ; University of CAS ; University of CAS ; University of CAS ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; NSFC ; NSFC ; NSFC ; NSFC ; NERC ; NERC ; NERC ; NERC ; University of CAS ; University of CAS ; University of CAS ; University of CAS ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; NSFC ; NSFC ; NSFC ; NSFC ; NERC ; NERC ; NERC ; NERC ; University of CAS ; University of CAS ; University of CAS ; University of CAS ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000751217400017
PublisherAMER GEOPHYSICAL UNION
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/104892
Collection岩石圈演化国家重点实验室
矿产资源研究院重点实验室
Corresponding AuthorDeng, Chen
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
2.Open Univ, Sch Environm Earth & Ecosyst Sci, Milton Keynes, Bucks, England
3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing, Peoples R China
First Author AffilicationInstitute of Geology and Geophysics, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Geology and Geophysics, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Deng, Chen,Jenner, Frances E.,Wan, Bo,et al. The Influence of Ridge Subduction on the Geochemistry of Vanuatu Arc Magmas[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2022,127(1):23.
APA Deng, Chen,Jenner, Frances E.,Wan, Bo,&Li, Ji-Lei.(2022).The Influence of Ridge Subduction on the Geochemistry of Vanuatu Arc Magmas.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,127(1),23.
MLA Deng, Chen,et al."The Influence of Ridge Subduction on the Geochemistry of Vanuatu Arc Magmas".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 127.1(2022):23.
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