{"@context":{"@vocab":"https://cir.nii.ac.jp/schema/1.0/","rdfs":"http://www.w3.org/2000/01/rdf-schema#","dc":"http://purl.org/dc/elements/1.1/","dcterms":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","prism":"http://prismstandard.org/namespaces/basic/2.0/","cinii":"http://ci.nii.ac.jp/ns/1.0/","datacite":"https://schema.datacite.org/meta/kernel-4/","ndl":"http://ndl.go.jp/dcndl/terms/","jpcoar":"https://github.com/JPCOAR/schema/blob/master/2.0/"},"@id":"https://cir.nii.ac.jp/crid/1361412894567450752.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1093/petrology/egaa022"}},{"identifier":{"@type":"URI","@value":"http://academic.oup.com/petrology/advance-article-pdf/doi/10.1093/petrology/egaa022/33291240/egaa022.pdf"}},{"identifier":{"@type":"URI","@value":"http://academic.oup.com/petrology/article-pdf/61/1/egaa022/37191346/egaa022.pdf"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"Temporal Evolution of Proto-Izu–Bonin–Mariana Arc Volcanism over 10 Myr: Constraints from Statistical Analysis of Melt Inclusion Compositions"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:title>Abstract</jats:title><jats:p>International Ocean Discovery Program (IODP) Expedition 351 ‘Izu–Bonin–Mariana (IBM) Arc Origins’ drilled Site U1438, situated in the northwestern region of the Philippine Sea. Here volcaniclastic sediments and the igneous basement of the proto-IBM volcanic arc were recovered. To gain a better understanding of the magmatic processes and evolution of the proto-IBM arc, we studied melt inclusions hosted in fresh igneous minerals and sampled from 30–40 Myr old deposits, reflecting the maturation of arc volcanism following subduction initiation at 52 Ma. We performed a novel statistical analysis on the major element composition of 237 representative melt inclusions selected from a previously published dataset, covering the full age range between 30 and 40 Ma. In addition, we analysed volatiles (H2O, S, F and Cl) and P2O5 by secondary ion mass spectrometry for a subset of 47 melt inclusions selected from the dataset. Based on statistical analysis of the major element composition of melt inclusions and by considering their trace and volatile element compositions, we distinguished five main clusters of melt inclusions, which can be further separated into a total of eight subclusters. Among the eight subclusters, we identified three major magma types: (1) enriched medium-K magmas, which form a tholeiitic trend (30–38 Ma); (2) enriched medium-K magmas, which form a calc-alkaline trend (30–39 Ma); (3) depleted low-K magmas, which form a calc-alkaline trend (35–40 Ma). We demonstrate the following: (1) the eruption of depleted low-K calc-alkaline magmas occurred prior to 40 Ma and ceased sharply at 35 Ma; (2) the eruption of depleted low-K calc-alkaline magmas, enriched medium-K calc-alkaline magmas and enriched medium-K tholeiitic magmas overlapped between 35 and 38–39 Ma; (3) the eruption of enriched medium-K tholeiitic and enriched medium-K calc-alkaline magmas became predominant thereafter at the proto-IBM arc. Identification of three major magma types is distinct from the previous work, in which enriched medium-K calc-alkaline magmas and depleted low-K calc-alkaline magmas were not identified. This indicates the usefulness of our statistical analysis as a powerful tool to partition a mixture of multivariable geochemical datasets, such as the composition of melt inclusions in this case. Our data suggest that a depleted mantle source had been replaced by an enriched mantle source owing to convection beneath the proto-IBM arc from &gt;40 to 35 Ma. Finally, thermodynamic modelling indicates that the overall geochemical variation of melt inclusions assigned to each cluster can be broadly reproduced either by crystallization differentiation assuming P = 50 MPa (∼2 km deep) and ∼2 wt% H2O (almost saturated H2O content at 50 MPa) or P = 300 MPa (∼15 km deep) and ∼6 wt% H2O (almost saturated H2O content at 300 MPa). Assuming oxygen fugacity (fO2) of log fO2 equal to +1 relative to the nickel–nickel oxide (NNO) buffer best reproduces the overall geochemical variation of melt inclusions, but assuming more oxidizing conditions (log fO2 = +1 to +2 NNO) probably reproduces the geochemical variation of enriched medium-K and calc-alkaline melt inclusions (30–39 Ma).</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1420564276165226240","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"60456853"},{"@type":"NRID","@value":"1000060456853"},{"@type":"NRID","@value":"9000004600478"},{"@type":"NRID","@value":"9000370281862"},{"@type":"NRID","@value":"9000257916754"},{"@type":"NRID","@value":"9000361699632"},{"@type":"NRID","@value":"9000002048187"},{"@type":"NRID","@value":"9000380982977"},{"@type":"RESEARCHMAP","@value":"https://researchmap.jp/morihisa-hamada"}],"foaf:name":[{"@value":"Morihisa Hamada"}],"jpcoar:affiliationName":[{"@value":"Solid Earth Geochemistry 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Ito"}],"jpcoar:affiliationName":[{"@value":"Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology, 200 Monobe-otsu, Nankoku, Kochi 783-8502, Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1381412894567450633","@type":"Researcher","foaf:name":[{"@value":"He Li"}],"jpcoar:affiliationName":[{"@value":"Center of Deep Sea Research, Institute of Oceanology, Chinese Academy of Sciences, 7 Nanhai Road, Qingdao 266071, China"},{"@value":"Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China"}]},{"@id":"https://cir.nii.ac.jp/crid/1381412894567450896","@type":"Researcher","foaf:name":[{"@value":"Ivan P Savov"}],"jpcoar:affiliationName":[{"@value":"Institute of Geophysics and Tectonics, School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK"}]}],"publication":{"publicationIdentifier":[{"@type":"EISSN","@value":"14602415"}],"prism:publicationName":[{"@value":"Journal of Petrology"}],"dc:publisher":[{"@value":"Oxford University Press (OUP)"}],"prism:publicationDate":"2020-01-01","prism:volume":"61","prism:number":"1","prism:startingPage":"egaa022"},"reviewed":"false","dc:rights":["http://creativecommons.org/licenses/by/4.0/"],"url":[{"@id":"http://academic.oup.com/petrology/advance-article-pdf/doi/10.1093/petrology/egaa022/33291240/egaa022.pdf"},{"@id":"http://academic.oup.com/petrology/article-pdf/61/1/egaa022/37191346/egaa022.pdf"}],"createdAt":"2020-02-10","modifiedAt":"2024-07-31","project":[{"@id":"https://cir.nii.ac.jp/crid/1040000781956275712","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"17H02994"},{"@type":"JGN","@value":"JP17H02994"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17H02994/"}],"notation":[{"@language":"ja","@value":"揮発性元素のマントル大循環"},{"@language":"en","@value":"Volatile Cycle in the 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