{"@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/1361981471046244352.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1016/j.chemgeo.2008.10.020"}},{"identifier":{"@type":"URI","@value":"https://api.elsevier.com/content/article/PII:S0009254108004749?httpAccept=text/xml"}},{"identifier":{"@type":"URI","@value":"https://api.elsevier.com/content/article/PII:S0009254108004749?httpAccept=text/plain"}}],"dc:title":[{"@value":"Tracing extinct spreading center in SW Japan by helium-3 emanation"}],"description":[{"notation":[{"@value":"Abstract   In the Kinki district of southwestern Japan, anomalously high  3 He/ 4 He ratios (high  Ra ) are observed in the frontal arc region. This globally unique phenomenon is called the “Kinki Spot.” These high- Ra  values are not attributable to dehydration of the young, warm subducting Philippine Sea slab based on the magma aging effect. A recent study reported that the source melt generated below the plate may penetrate a large slab tear fissure and arrive at the shallow crust by upwelling flow. To verify this hypothesis, we collected 25 gas and water samples from hot springs in the northern district and measured the  3 He/ 4 He and  4 He/ 20 Ne ratios of these samples. The geographical distribution of high- Ra  values revealed not a spot but a region extending parallel to the extinct spreading center in the Shikoku Basin. More precisely, the distribution is shaped like a backwards letter “L,” suggesting that the subducted spreading center may have been a mid-ocean ridge with a transform fault. This hypothesis is supported by seismic tomography results and is consistent with the geometry of the subducting slab deduced from seismic isodepth contours as well as that of a young magnetic anomaly in the region. Thus, the high  3 He emanation may trace an extinct ridge–transform–ridge type spreading center in a subduction zone."}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1381981471046244353","@type":"Researcher","foaf:name":[{"@value":"Yuji Sano"}]},{"@id":"https://cir.nii.ac.jp/crid/1381981471046244480","@type":"Researcher","foaf:name":[{"@value":"Ayano Kameda"}]},{"@id":"https://cir.nii.ac.jp/crid/1381981471046244352","@type":"Researcher","foaf:name":[{"@value":"Naoto Takahata"}]},{"@id":"https://cir.nii.ac.jp/crid/1381981471046244354","@type":"Researcher","foaf:name":[{"@value":"Junji Yamamoto"}]},{"@id":"https://cir.nii.ac.jp/crid/1381981471046244481","@type":"Researcher","foaf:name":[{"@value":"Junichi Nakajima"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"00092541"}],"prism:publicationName":[{"@value":"Chemical Geology"}],"dc:publisher":[{"@value":"Elsevier BV"}],"prism:publicationDate":"2009-08","prism:volume":"266","prism:number":"1-2","prism:startingPage":"50","prism:endingPage":"56"},"reviewed":"false","dc:rights":["https://www.elsevier.com/tdm/userlicense/1.0/","https://www.elsevier.com/legal/tdmrep-license"],"url":[{"@id":"https://api.elsevier.com/content/article/PII:S0009254108004749?httpAccept=text/xml"},{"@id":"https://api.elsevier.com/content/article/PII:S0009254108004749?httpAccept=text/plain"}],"createdAt":"2008-10-29","modifiedAt":"2025-09-14","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360002215916398336","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Tottori earthquakes and Daisen volcano: Effects of fluids, slab melting and hot mantle upwelling"}]},{"@id":"https://cir.nii.ac.jp/crid/1360283689325121408","@type":"Article","resourceType":"学術雑誌論文(journal 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Philippine Sea plate beneath Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1360572092392748288","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Fluid Dynamics along the Nankai Trough: He Isotopes Reveal Direct Seafloor Mantle-Fluid Emission in the Kumano Basin (Southwest Japan)"}]},{"@id":"https://cir.nii.ac.jp/crid/1360580229797111040","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Revisiting Mt Fuji’s groundwater origins with helium, vanadium and environmental DNA tracers"}]},{"@id":"https://cir.nii.ac.jp/crid/1360584340703980800","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Deep subduction of the Philippine Sea slab and formation of slab window beneath central Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282679399386496","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Origin of saline waters distributed along the Median Tectonic Line in southwest Japan: Hydrogeochemical investigation on possibility of derivation of metamorphic dehydrated fluid from subducting oceanic plate"},{"@language":"ja","@value":"中央構造線沿いに湧出する高塩分泉の起源"},{"@value":"中央構造線沿いに湧出する高塩分泉の起源 : プレート脱水流体起源の可能性についての水文化学的検討"},{"@language":"ja-Kana","@value":"チュウオウ コウゾウセン ゾイ ニ ユウシュツ スル コウエンブンセン ノ キゲン : プレート ダッスイ リュウタイ キゲン ノ カノウセイ ニ ツイテ ノ スイモン カガクテキ ケントウ"}]},{"@id":"https://cir.nii.ac.jp/crid/2051433317070229760","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Arima hot spring waters as a deep-seated brine from subducting slab"}]},{"@id":"https://cir.nii.ac.jp/crid/2120026414553243392","@type":"OtherWorks","resourceType":"学術雑誌論文(journal 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