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The Influence of Ridge Subduction on the Geochemistry of Vanuatu Arc Magmas

文献类型：期刊论文

作者Deng, Chen1,3; Jenner, Frances E.3; Wan, Bo1; Li, Ji-Lei2
刊名JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
出版日期2022
卷号127期号:1页码:23
关键词Vanuatu arc shallow subduction slab tear asthenosphere upwelling forearc magmatism
ISSN号2169-9313
DOI10.1029/2021JB022833
英文摘要The 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.
WOS关键词PAPUA-NEW-GUINEA ; PORPHYRY CU ; ISLAND-ARC ; SULFIDE SATURATION ; COPPER SYSTEMATICS ; OXIDATION-STATE ; HEBRIDES ARC ; AU DEPOSITS ; MANTLE ; VOLCANO
资助项目NSFC[41888101] ; NSFC[91855207] ; NSFC[41772056] ; NSFC[42122011] ; NERC[NE/P017045/1] ; University of CAS ; China Scholarship Council
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000751217400017
出版者AMER GEOPHYSICAL UNION
资助机构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 ; 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
源URL[http://ir.iggcas.ac.cn/handle/132A11/104892]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
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
通讯作者Deng, Chen
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing, Peoples R China
3.Open Univ, Sch Environm Earth & Ecosyst Sci, Milton Keynes, Bucks, England
推荐引用方式
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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来源：地质与地球物理研究所

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