{"@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/1050574201775550720.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"HDL","@value":"http://hdl.handle.net/20.500.12000/37645"}},{"identifier":{"@type":"URI","@value":"https://u-ryukyu.repo.nii.ac.jp/records/2008846"}},{"identifier":{"@type":"DOI","@value":"10.1111/j.1468-8123.2008.00223.x"}},{"identifier":{"@type":"URI","@value":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1468-8123.2008.00223.x"}},{"identifier":{"@type":"URI","@value":"https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1468-8123.2008.00223.x"}},{"identifier":{"@type":"NAID","@value":"120006389526"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@language":"en","@value":"Geological background of the Kairei and Edmond hydrothermal fields along the Central Indian Ridge : Implications for the distinct chemistry between their vent fluids"},{"@value":"Geological background of the Kairei and Edmond hydrothermal fields along the Central Indian Ridge: Implications of their vent fluids’ distinct chemistry"},{"@value":"Geological background of the Kairei and Edmond hydrothermal vent fields along the Central Indian Ridge: Insights into the distinct chemistry between their vent fluids"}],"dc:language":"en","description":[{"type":"Other","notation":[{"@value":"Hydrogen-rich hydrothermal areas, such as those in the Indian Ocean, may have had an influence on early evolution of life on Earth and thus have attracted interest because they may be a proxy for ancient ecosystems. The Kairei and Edmond hydrothermal fields in the Indian Ocean are separated by 160 km, but exhibit distinct fluid chemistry: Kairei fluids are hydrogen-rich; Edmond fluids are hydrogen-poor. At this region, the Central Indian Ridge shows an intermediate spreading rate, 48 mm year−1 as full rate, where the hydrothemal fields occur. Kairei field vent fluids show persistently high concentrations of H2. The Kairei field seems to be unique among hydrogen-enriched hydrothermal regions: most similar hydrogen-rich hydrothermal activity occurs along slowly spreading ridge, <40 mm year−1. The geological and tectonic aspects of the Kairei and Edmond hydrothermal fields were studied to try to elucidate geological constraints on hydrogen production. Visual observations of the seafloor near Kairei from a submersible revealed olivine-rich plutonic rocks with olivine gabbro-troctolite-dunite assemblages exposed within 15 km of the vent field, with serpentinized ultramafic mantle rocks on the Oceanic Core Complex (OCC). The OCC area might be a recharge zone of Kairei hydrothermal activity producing H2-rich vent fluids. The chaotic seafloor within 30 km of the Kairei field reflects a magma-starved condition persisting there for 1 Myr. Asymmetric geomagnetic and gravity anomalies near the Kairei field can be used to infer that patchy olivine-rich intrusions are scattered within mantle ultramafics, where infiltrated seawater reacts with magma and ultramafic rocks or olivine-rich rocks. The heterogeneous uppermost lithosphere containing shallow olivine-rich rock facies surrounding the Kairei field provides abundant H2 into the vent fluid through serpentinization. The hydrogen-rich Kairei field is hosted by basalt, with mafic-ultramafic olivine-rich lithology; the ordinary, hydrogen-poor Edmond field is hosted by a normal basaltic lithology. The contrasting geochemical signatures of the two fields reported here can also be found in ancient rocks from a juvenile Earth. This suggests that lithology-controlled generation of hydrogen may have operated for a long time and be relevant to the origin of life on Earth."}]},{"type":"Other","notation":[{"@value":"論文"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1070574201775550725","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000381474602"}],"foaf:name":[{"@language":"en","@value":"Kumagai, Hidenori"}]},{"@id":"https://cir.nii.ac.jp/crid/1070574201775550724","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000381474603"}],"foaf:name":[{"@language":"en","@value":"Nakamura, 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Tomohiro"}]},{"@id":"https://cir.nii.ac.jp/crid/1070574201775550726","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000381474605"}],"foaf:name":[{"@language":"en","@value":"Morishita, Tomoaki"}]},{"@id":"https://cir.nii.ac.jp/crid/1070574201775550720","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000381474606"}],"foaf:name":[{"@language":"en","@value":"Okino, Kyoko"}]},{"@id":"https://cir.nii.ac.jp/crid/1070574201775550732","@type":"Researcher","foaf:name":[{"@language":"en","@value":"Ishibashi, Jun-ichiro"}]},{"@id":"https://cir.nii.ac.jp/crid/1420282801209275648","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"50313367"},{"@type":"NRID","@value":"1000050313367"},{"@type":"NRID","@value":"9000340465286"},{"@type":"NRID","@value":"9000367422853"},{"@type":"NRID","@value":"9000381474608"},{"@type":"NRID","@value":"9000403579503"},{"@type":"NRID","@value":"9000392826641"},{"@type":"NRID","@value":"9000414331779"},{"@type":"NRID","@value":"9000250752448"},{"@type":"NRID","@value":"9000254146664"},{"@type":"NRID","@value":"9000398991200"},{"@type":"NRID","@value":"9000392826265"},{"@type":"NRID","@value":"9000254147017"},{"@type":"NRID","@value":"9000403100057"},{"@type":"NRID","@value":"9000257788172"},{"@type":"NRID","@value":"9000405857916"},{"@type":"NRID","@value":"9000392826096"},{"@type":"NRID","@value":"9000414390070"},{"@type":"NRID","@value":"9000414923066"},{"@type":"NRID","@value":"9000325832047"},{"@type":"NRID","@value":"9000254754344"},{"@type":"NRID","@value":"9000414094193"},{"@type":"NRID","@value":"9000018461428"},{"@type":"NRID","@value":"9000381474640"},{"@type":"NRID","@value":"9000381474622"},{"@type":"NRID","@value":"9000403579387"},{"@type":"NRID","@value":"9000414939760"},{"@type":"NRID","@value":"9000411077115"},{"@type":"NRID","@value":"9000347188860"},{"@type":"NRID","@value":"9000262362887"},{"@type":"NRID","@value":"9000414840572"},{"@type":"NRID","@value":"9000340465030"},{"@type":"RESEARCHMAP","@value":"https://researchmap.jp/read0059502"}],"foaf:name":[{"@language":"en","@value":"Tsunogai, Urumu"}]},{"@id":"https://cir.nii.ac.jp/crid/1070574201775550730","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000381474609"}],"foaf:name":[{"@language":"en","@value":"Kawaguchi, Shinsuke"}]},{"@id":"https://cir.nii.ac.jp/crid/1070574201775550734","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000381474610"}],"foaf:name":[{"@language":"en","@value":"Gano, Toshitaka"}]},{"@id":"https://cir.nii.ac.jp/crid/1070574201775550728","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000381474611"}],"foaf:name":[{"@language":"en","@value":"Shibuya, Takazo"}]},{"@id":"https://cir.nii.ac.jp/crid/1070574201775550733","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000381474612"}],"foaf:name":[{"@language":"en","@value":"Sawaguchi, Takashi"}]},{"@id":"https://cir.nii.ac.jp/crid/1070574201775550721","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000381474613"}],"foaf:name":[{"@language":"en","@value":"Neo, Natsuki"}]},{"@id":"https://cir.nii.ac.jp/crid/1070574201775550731","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000381474614"}],"foaf:name":[{"@language":"en","@value":"Joshima, Masato"}]},{"@id":"https://cir.nii.ac.jp/crid/1070574201775550727","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000381474615"}],"foaf:name":[{"@language":"en","@value":"Sato, Taichi"}]},{"@id":"https://cir.nii.ac.jp/crid/1070574201775550729","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000381474616"}],"foaf:name":[{"@language":"en","@value":"Takai, Ken"}]}],"publication":{"publicationIdentifier":[{"@type":"ISSN","@value":"14688115"},{"@type":"ISSN","@value":"14688123"},{"@type":"PISSN","@value":"14688115"},{"@type":"EISSN","@value":"14688123"}],"prism:publicationName":[{"@language":"en","@value":"Geofluids"}],"dc:publisher":[{"@value":"Blackwell Publishing Ltd"}],"prism:publicationDate":"2008-11-25","prism:volume":"8","prism:number":"4","prism:startingPage":"239","prism:endingPage":"251"},"reviewed":"false","dcterms:accessRights":"http://purl.org/coar/access_right/c_abf2","dc:rights":["©2008 The Authors Journal compilation©2008 Blackwell Publishing Ltd"],"url":[{"@id":"https://u-ryukyu.repo.nii.ac.jp/records/2008846"},{"@id":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1468-8123.2008.00223.x"},{"@id":"https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1468-8123.2008.00223.x"},{"@id":"http://hdl.handle.net/20.500.12000/37645"}],"foaf:topic":[{"@id":"https://cir.nii.ac.jp/all?q=hydrogen%20production","dc:title":"hydrogen production"},{"@id":"https://cir.nii.ac.jp/all?q=Kairei%20hydrothermal%20field","dc:title":"Kairei hydrothermal field"},{"@id":"https://cir.nii.ac.jp/all?q=oceanic%20core%20complex","dc:title":"oceanic core complex"},{"@id":"https://cir.nii.ac.jp/all?q=serpentinization","dc:title":"serpentinization"},{"@id":"https://cir.nii.ac.jp/all?q=troctolite","dc:title":"troctolite"},{"@id":"https://cir.nii.ac.jp/all?q=Uraniwa%20Hills","dc:title":"Uraniwa Hills"}],"dcterms:subject":[{"subjectScheme":"Other","notation":[{"@language":"en","@value":"hydrogen production"}]},{"subjectScheme":"Other","notation":[{"@language":"en","@value":"Kairei hydrothermal field"}]},{"subjectScheme":"Other","notation":[{"@language":"en","@value":"oceanic core complex"}]},{"subjectScheme":"Other","notation":[{"@language":"en","@value":"serpentinization"}]},{"subjectScheme":"Other","notation":[{"@language":"en","@value":"troctolite"}]},{"subjectScheme":"Other","notation":[{"@language":"en","@value":"Uraniwa Hills"}]}],"relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1050283688373022720","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Near-seafloor magnetic mapping of off-axis lava flows near the Kairei and Yokoniwa hydrothermal vent fields in the Central Indian Ridge"}]},{"@id":"https://cir.nii.ac.jp/crid/1050292726798936192","@type":"Article","resourceType":"学術雑誌論文(journal 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Chemolithoautotrophic Ecosystem"},{"@language":"ja","@value":"海底熱水系の物理・化学的多様性と化学合成微生物生態系の存在様式"},{"@language":"ja-Kana","@value":"カイテイ ネッスイケイ ノ ブツリ カガクテキ タヨウセイ ト カガク ゴウセイ ビセイブツ セイタイケイ ノ ソンザイ ヨウシキ"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001204553111296","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Geochemical characteristics of hydrothermal fluids at Hatoma Knoll in the southern Okinawa Trough"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001206240889984","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Drilling into deep-seated hard rocks of the oceanic plate formed at the Mid-Ocean Ridge: results and future perspectives: Deep-seated Hard Rock Drilling"},{"@language":"ja","@value":"中央海嶺産海洋プレート深部起源岩石掘削の成果と展望"},{"@language":"ja-Kana","@value":"チュウオウカイレイサン カイヨウ プレート シンブ キゲン ガンセキ クッサク ノ セイカ ト テンボウ"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282679529549696","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"H2 generation by experimental hydrothermal alteration of komatiitic glass at 300°C and 500 bars: A preliminary result from on-going experiment"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282679529703296","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Gas geochemical characteristics of hydrothermal plumes at the HAKUREI and JADE vent sites, the Izena Cauldron, Okinawa Trough"},{"@value":"Gas geochemical characteristics of hydrothermal plumes at the HAKUREI and JADE vent sides, the Izena Cauldron, Okinawa Trough"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282681503323008","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"A recent trend in sciences on mantle-derived materials, with special emphases on refertilization, rheology, and ophiolite problems: a report of the Fifth International Conference on Orogenic Lherzolite"},{"@language":"ja","@value":"マントル科学研究の最近の動向‐特に再肥沃化，レオロジー，オフィオライト問題：第５回国際レルゾライト会議報告"},{"@value":"マントル科学研究の最近の動向--特に再肥沃化,レオロジー,オフィオライト問題--第5回国際レルゾライト会議報告"},{"@language":"ja-Kana","@value":"マントル カガク ケンキュウ ノ サイキン ノ ドウコウ トクニ サイヒヨクカ レオロジー オフィオライト モンダイ ダイ5カイ コクサイ レルゾライト カイギ ホウコク"}]},{"@id":"https://cir.nii.ac.jp/crid/1390859868585088384","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Formation and evolution of the uppermost mantle of oceanic plate and island arc based on natural samples of ultramafic-mafic rocks"},{"@language":"ja","@value":"超苦鉄質―苦鉄質岩に着目した物質科学的アプローチによる海洋プレート及び島弧下マントルの形成・進化プロセスの研究"}]},{"@id":"https://cir.nii.ac.jp/crid/2050025942005882880","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Reactions 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