{"@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/1361699993973519104.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1016/j.chemgeo.2006.10.008"}},{"identifier":{"@type":"URI","@value":"https://api.elsevier.com/content/article/PII:S0009254106004724?httpAccept=text/xml"}},{"identifier":{"@type":"URI","@value":"https://api.elsevier.com/content/article/PII:S0009254106004724?httpAccept=text/plain"}}],"dc:title":[{"@value":"Origin and age of pore waters in an actively venting gas hydrate field near Sado Island, Japan Sea: Interpretation of halogen and 129I distributions"}],"description":[{"notation":[{"@value":"Abstract   A gas hydrate field with highly active venting of methane was recently found near Sado Island in the eastern Japan Sea. Piston cores were collected from active venting sites and nearby locations in the Umitaka Spur–Joetsu Knoll area during two cruises in 2004 (UT04) and 2005 (KY05-08). We report here halogen concentrations and  129 I/I ratios in pore waters associated with gas hydrates from these expeditions. The strongly biophilic behavior of I and, to a lesser degree, of Br together with the presence of the long-lived iodine radioisotope ( 129 I) allow evaluation of potential source materials for methane in gas hydrate systems. Depth profiles of all three halogens, particularly the very rapid downward increases of Br and I concentrations, strongly suggest input of deep fluids enriched in Br and I, but the profiles also display the effects of gas hydrate formation and dissociation. Although the  129 I/I ratios are modified by  129 I from seawater and sediments at shallow depth, likely ratios of the deep fluids are estimated to be between 400 × 10 − 15  and 600 × 10 − 15 , equivalent to a Late Oligocene to Early Miocene age. Ages in the active methane venting sites typically are closer to the old end of this range than those in the reference sites. This age range suggests that the methane associated with venting and gas hydrate formation in this area is derived from organic materials accumulated during the initial opening of the Japan Sea. The Umitaka Spur–Joetsu Knoll gas hydrate field demonstrates the movement of deep fluids associated with the release of significant amounts of methane from the seafloor, processes which might be important components of mass transfer and carbon cycle in the shallow geosphere."}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1381699993973519106","@type":"Researcher","foaf:name":[{"@value":"Hitoshi Tomaru"}]},{"@id":"https://cir.nii.ac.jp/crid/1381699993973519109","@type":"Researcher","foaf:name":[{"@value":"Zunli Lu"}]},{"@id":"https://cir.nii.ac.jp/crid/1381699993973519107","@type":"Researcher","foaf:name":[{"@value":"Glen T. Snyder"}]},{"@id":"https://cir.nii.ac.jp/crid/1381699993973519108","@type":"Researcher","foaf:name":[{"@value":"Udo Fehn"}]},{"@id":"https://cir.nii.ac.jp/crid/1381699993973519104","@type":"Researcher","foaf:name":[{"@value":"Akihiro Hiruta"}]},{"@id":"https://cir.nii.ac.jp/crid/1381699993973519105","@type":"Researcher","foaf:name":[{"@value":"Ryo Matsumoto"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"00092541"}],"prism:publicationName":[{"@value":"Chemical Geology"}],"dc:publisher":[{"@value":"Elsevier BV"}],"prism:publicationDate":"2007-01","prism:volume":"236","prism:number":"3-4","prism:startingPage":"350","prism:endingPage":"366"},"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:S0009254106004724?httpAccept=text/xml"},{"@id":"https://api.elsevier.com/content/article/PII:S0009254106004724?httpAccept=text/plain"}],"createdAt":"2006-12-13","modifiedAt":"2025-09-14","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1050282814043530112","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Endolithic Microbial Habitats Hosted in Carbonate Nodules Currently Forming within Sediment at a High Methane Flux Site in the Sea of Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1360004232352395776","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"First measurements of methane and its carbon isotope ratio in the Japan Sea (East Sea)"}]},{"@id":"https://cir.nii.ac.jp/crid/1360846640867381376","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Age and speciation of iodine in groundwater and mudstones of the Horonobe area, Hokkaido, Japan: Implications for the origin and migration of iodine during basin evolution"}]},{"@id":"https://cir.nii.ac.jp/crid/1361975841571704320","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Magmatic fluids play a role in the development of active gas chimneys and massive gas hydrates in the Japan Sea"}]},{"@id":"https://cir.nii.ac.jp/crid/1361975843215282304","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Evidence in the Japan Sea of microdolomite mineralization within gas hydrate microbiomes"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282679205363328","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"ja","@value":"オホーツク海および日本海に胚胎する表層型ガスハイドレート鉱床における間隙水のハロゲンと放射性ヨウ素同位体（<sup>129</sup>I）の地球化学"},{"@language":"en","@value":"Geochemistry of Halogen and Iodine Radioisotope (<sup>129</sup>I) in Pore Waters from Shallow Gas Hydrate Systems in the Okhotsk Sea and Japan Sea"},{"@value":"オホーツク海および日本海に胚胎する表層型ガスハイドレート鉱床における間隙水のハロゲンと放射性ヨウ素同位体(129I)の地球化学"},{"@language":"ja-Kana","@value":"オホーツクカイ オヨビ ニホンカイ ニ ハイタイスル ヒョウソウガタ ガスハイドレート コウショウ ニ オケル カンゲキスイ ノ ハロゲン ト ホウシャセイ ヨウソ ドウイタイ 129I ノ チキュウ カガク"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282679206710400","@type":"Article","resourceType":"学術雑誌論文(journal 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study of foraminifera"}]},{"@id":"https://cir.nii.ac.jp/crid/2050025942186679296","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Groundwater, possibly originated from subducted sediments, in Joban and Hamadori areas, southern Tohoku, 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