{"@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/1361137045306925312.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1038/370205a0"}},{"identifier":{"@type":"URI","@value":"http://www.nature.com/articles/370205a0"}},{"identifier":{"@type":"URI","@value":"http://www.nature.com/articles/370205a0.pdf"}}],"dc:title":[{"@value":"Origin of the slab component in arc lavas from across-arc variation of B and Pb isotopes"}],"description":[{"notation":[{"@value":"AT convergent margins, the subducting oceanic slab is thought to dehydrate, producing fluids which metasomatize the overlying mantle wedge where island-arc magma forms. However, the nature and origin of the metasomatizing fluid, its source composition and its relation to the genesis of the chemical characteristics of arc magmas are largely controversial. Across-arc variation in the chemistry of arc lavas provides a useful key to this problem, because it may reflect the changes in the physical conditions of the subducting slab that control mass transfer from slab to mantle wedge as a function of depth. Here we report clear across-arc variations in the concentrations and isotopic compositions of boronand lead observed in lavas from the Izu arc (Japan). Our data suggest that a homogeneous slab fluid contributes to all Izu volcan-oes, but that the amount of this fluid decreases continuously with increasing depth of the subducting slab. Whereas the Izu slab fluid conies primarily from altered oceanic crust, our data for high-Mg andesites from the Setouchi volcanic belt (a nearby fore-arc) indicate a significant involvement of sediment in the fluid source."}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1381137045306925312","@type":"Researcher","foaf:name":[{"@value":"Tsuyoshi Ishikawa"}]},{"@id":"https://cir.nii.ac.jp/crid/1381137045306925313","@type":"Researcher","foaf:name":[{"@value":"Eizo Nakamura"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"00280836"},{"@type":"EISSN","@value":"14764687"}],"prism:publicationName":[{"@value":"Nature"}],"dc:publisher":[{"@value":"Springer Science and Business Media LLC"}],"prism:publicationDate":"1994-07","prism:volume":"370","prism:number":"6486","prism:startingPage":"205","prism:endingPage":"208"},"reviewed":"false","dc:rights":["http://www.springer.com/tdm"],"url":[{"@id":"http://www.nature.com/articles/370205a0"},{"@id":"http://www.nature.com/articles/370205a0.pdf"}],"createdAt":"2003-08-12","modifiedAt":"2023-05-17","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360004232051033600","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Boron isotope geochemistry of vent fluids from arc/back-arc seafloor hydrothermal systems in the western Pacific"}]},{"@id":"https://cir.nii.ac.jp/crid/1360004232051037312","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Boron isotope systematics of a fossil hydrothermal system from the Troodos ophiolite, Cyprus: Water–rock interactions in the oceanic 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Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1360283690913830016","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Boron and oxygen isotope systematics for a complete section of oceanic crustal rocks in the Oman ophiolite"}]},{"@id":"https://cir.nii.ac.jp/crid/1360283692107809536","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Slab melting versus slab dehydration in subduction-zone magmatism"}]},{"@id":"https://cir.nii.ac.jp/crid/1360285704782249856","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Origin of ultra rear‐arc magmatism at <scp>R</scp>ishiri <scp>V</scp>olcano, <scp>K</scp>uril <scp>A</scp>rc"}]},{"@id":"https://cir.nii.ac.jp/crid/1360285705096233984","@type":"Article","resourceType":"学術雑誌論文(journal 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