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No seamount subduction,no magmatic arc?

Earth and Planetary Physics 2022年第4期6卷 424-429页

作者： XiaoBo He JunTao Tao Yi Cao FaBin Pan EnYuan He LingMin Cao YiXian Zheng Department of Ocean Exploration&Technology Zhejiang Ocean UniversityZhoushan Zhejiang 316022China School of Earth Sciences China University of GeosciencesWuhan 430074China Key Laboratory of Ocean and Marginal Sea Geology South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Department of Marine Sciences Zhejiang UniversityZhoushan Zhejiang 316021China

Water is essential for the formation of a magmatic arc by lowering the melting temperature of materials in the mantle *** such,it is logical to attribute the absence of a magmatic arc to insufficient water released from the subducting plate,although a number of other factors may cause volcanic arc quiescence as well,such as a slab window or flat slab *** this contribution,we present a possible but testable correlation between the occurrence of a magmatic arc and seamount subduction in light of bathymetric data obtained near *** correlation,if it holds true,in turn means that a magmatic arc is unlikely to occur when the subducting slabs have not been severely fractured and that one of the main reasons for excluding effects such as the slab window or flat slab subduction may be that the plate is not accompanied by ***,the role that seamount subduction plays in recycling water back into the mantle deserves more attention from the earth sciences community.

关键词： seamount subduction arc volcano slab dehydration slab faulting bathymetric anomaly

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Geochemistry of subducted metabasites exhumed from the Mariana forearc:Implications for Pacific seamount subduction

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Geoscience Frontiers 2021年第3期12卷 358-369页

作者： Jianghong Deng Lipeng Zhang He Liu Haiyang Liu Renqiang Liao Abdul Shakoor Mastoi Xiaoyong Yang Weidong Sun Center of Deep Sea Research Institute of OceanologyCenter for Ocean Mega-ScienceChinese Academy of SciencesQingdao 266071China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China CAS Key Laboratory of Crust-Mantle Materials and Environments University of Science and Technology of ChinaHefei 230026China University of Chinese Academy of Sciences Beijing 100049China Centre for Pure and Applied Geology University of SindhJamshoro 76080Pakistan

seamounts on the drifting oceanic crust are inevitably carried by plate motions and eventually accreted or ***,the geochemical signatures of the subducted seamounts and the significance of seamount subduction are not well *** of seamounts have subducted beneath the Philippine Sea Plate following the westward subduction of the Pacific Plate since the Eocene(~52 Ma).The subducted oceanic crust and seamount materials can be exhumed from the mantle depth to the seafloor in the Mariana forearc region by serpentinite mud volcanoes,providing exceptional opportunities to directly study the subducted oceanic crust and *** International Ocean Discovery Program(IODP)expedition 366 has recovered a few metamorphosed mafic clasts exhumed from the Mariana forearc serpentinite mud volcanoes,e.g.,the Fantangis?a and Asùt Tesoru *** mafic clasts have tholeiitic to alkaline affinities with distinct trace elements and Nd-Hf isotopes characteristics,suggesting different provenances and mantle *** tholeiites from the Fantangisna seamount have trace element characteristics typical of mid-ocean ridge *** Pacific-type Hf-Nd isotopic compositions,combined with the greenschist metamorphism of these tholeiites further suggest that they came from the subducted Pacific oceanic *** alkali basalts-dolerites from the Fantangisna and Asùt Tesoru seamounts show ocean island basalt(OIB)-like geochemical *** OIB-like geochemical signatures and the low-grade metamorphism of these alkali basalts-dolerites suggest they came from subducted seamounts that originally formed in an intraplate setting on the Pacific *** Pacific Plate origin of these metabasites suggests they were formed in the Early Cretaceous or *** types of OIBs have been recognized from alkali metabasites,one of which is geochemically similar to the HIMU-EMI-type OIBs from the West Pacific seamount Province,and another is similar to the EM

关键词： IODP 366 Mariana convergent margin Forearc seamount subduction OIB

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