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  1. 学術雑誌論文
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  1. 部局別インデックス
  2. 理学部

Geological background of the Kairei and Edmond hydrothermal fields along the Central Indian Ridge : Implications for the distinct chemistry between their vent fluids

http://hdl.handle.net/20.500.12000/37645
http://hdl.handle.net/20.500.12000/37645
fb1b31e6-ae20-4d90-a907-9c4c398d13f3
名前 / ファイル ライセンス アクション
Vol8no4p239no.pdf Vol8no4p239no.pdf
Item type デフォルトアイテムタイプ(フル)(1)
公開日 2018-02-05
タイトル
タイトル Geological background of the Kairei and Edmond hydrothermal fields along the Central Indian Ridge : Implications for the distinct chemistry between their vent fluids
言語 en
作成者 Kumagai, Hidenori

× Kumagai, Hidenori

en Kumagai, Hidenori

Nakamura, Kentaro

× Nakamura, Kentaro

en Nakamura, Kentaro

Toki, Tomohiro

× Toki, Tomohiro

en Toki, Tomohiro

Morishita, Tomoaki

× Morishita, Tomoaki

en Morishita, Tomoaki

Okino, Kyoko

× Okino, Kyoko

en Okino, Kyoko

Ishibashi, Jun-ichiro

× Ishibashi, Jun-ichiro

en Ishibashi, Jun-ichiro

Tsunogai, Urumu

× Tsunogai, Urumu

en Tsunogai, Urumu

Kawaguchi, Shinsuke

× Kawaguchi, Shinsuke

en Kawaguchi, Shinsuke

Gano, Toshitaka

× Gano, Toshitaka

en Gano, Toshitaka

Shibuya, Takazo

× Shibuya, Takazo

en Shibuya, Takazo

Sawaguchi, Takashi

× Sawaguchi, Takashi

en Sawaguchi, Takashi

Neo, Natsuki

× Neo, Natsuki

en Neo, Natsuki

Joshima, Masato

× Joshima, Masato

en Joshima, Masato

Sato, Taichi

× Sato, Taichi

en Sato, Taichi

Takai, Ken

× Takai, Ken

en Takai, Ken

アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
権利情報
言語 ja
権利情報 ©2008 The Authors Journal compilation©2008 Blackwell Publishing Ltd
主題
言語 en
主題Scheme Other
主題 hydrogen production
言語 en
主題Scheme Other
主題 Kairei hydrothermal field
言語 en
主題Scheme Other
主題 oceanic core complex
言語 en
主題Scheme Other
主題 serpentinization
言語 en
主題Scheme Other
主題 troctolite
言語 en
主題Scheme Other
主題 Uraniwa Hills
内容記述
内容記述タイプ Other
内容記述 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.
内容記述タイプ Other
内容記述 論文
出版者
言語 en
出版者 Blackwell Publishing Ltd
言語
言語 eng
資源タイプ
資源タイプ journal article
資源タイプ識別子 http://purl.org/coar/resource_type/c_6501
出版タイプ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
識別子
識別子 http://hdl.handle.net/20.500.12000/37645
識別子タイプ HDL
関連情報
関連識別子
識別子タイプ DOI
関連識別子 https://doi.org/10.1111/j.1468-8123.2008.00223.x
関連識別子
識別子タイプ DOI
関連識別子 info:doi/10.1111/j.1468-8123.2008.00223.x
収録物識別子
収録物識別子タイプ ISSN
収録物識別子 1468-8115
収録物識別子タイプ ISSN
収録物識別子 1468-8123
収録物名
言語 en
収録物名 Geofluids
書誌情報
巻 8, 号 4, p. 239-251, 発行日 2008-11-25
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