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  1. 学術雑誌論文
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Methane production and accumulation in the Nankai accretionary prism: Results from IODP Expeditions 315 and 316

http://hdl.handle.net/20.500.12000/37847
http://hdl.handle.net/20.500.12000/37847
43eff5a5-a963-4ca7-92bb-19b091272f15
名前 / ファイル ライセンス アクション
Vol46no2p89.pdf Vol46no2p89.pdf
Item type デフォルトアイテムタイプ(フル)(1)
公開日 2018-02-14
タイトル
タイトル Methane production and accumulation in the Nankai accretionary prism: Results from IODP Expeditions 315 and 316
言語 en
作成者 Toki, Tomohiro

× Toki, Tomohiro

en Toki, Tomohiro

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Uehara, Yuto

× Uehara, Yuto

en Uehara, Yuto

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Kinjo, Kazunari

× Kinjo, Kazunari

en Kinjo, Kazunari

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Ijiri, Akira

× Ijiri, Akira

en Ijiri, Akira

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Tsunogai, Urumu

× Tsunogai, Urumu

en Tsunogai, Urumu

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Tomaru, Hitoshi

× Tomaru, Hitoshi

en Tomaru, Hitoshi

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Asahi, Juichiro

× Asahi, Juichiro

en Asahi, Juichiro

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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
主題
言語 en
主題Scheme Other
主題 Nankai accretionary prism
主題
言語 en
主題Scheme Other
主題 IODP
主題
言語 en
主題Scheme Other
主題 origin of methane
主題
言語 en
主題Scheme Other
主題 carbon isotope
主題
言語 en
主題Scheme Other
主題 methanogenesis
内容記述
内容記述タイプ Other
内容記述 Pore waters were taken from core sediments of Sites C0001, C0004, and C0008 on the landward slope of the Nankai Trough and Site C0002 in the forearc basin of the Nankai accretionary prism off Kumano during Integrated Ocean Drilling Program Expeditions 315 and 316. The carbon isotopic ratios of CH4 and total carbon dioxide (∑CO2) in dissolved gases were measured. The contribution of thermogenic CH4 was negligible at all sites, while carbon isotopic separation between CH4 and ∑CO2 indicated that CH4 formation was mainly by microbial hydrogenotrophic methanogenesis. Evaluation of the isotopic fraction of the initial substrate ∑CO2 pool showed larger fractionation at Site C0002 than at the other sites in the transect. In addition, the NH4+ concentration was higher at Site C0002 than at the other sites, indicating that organic matter degradation occurred more actively at Site C0002 than at the other sites. Therefore, CO2 and H2 as well as NH4+ were actively generated by the organic matter degradation at Site C0002, which could stimulate methanogenesis utilizing CO2 and H2 as substrates at Site C0002. The high sedimentation rate at Site C0002 in the forearc basin was due to the geomorphological setting of the site, within the outer ridge rimming the sediment-filled Kumano Basin, leading to organic matter burial without aerobic degradation on the surface of the seafloor, which preserve labile organic matter for utilization by methanogenesis. On the other hand, slope sediments were already exposed by organic matter degradation, which leaves scarce labile organic matter for supporting CH4 generation. Geomorphology was possibly an important factor controlling CH4 formation and accumulation, and the Kumano Basin sediments have greater potential as a CH4 hydrate reservoir than the landward slope sediments in the Nankai accretionary prism off Kumano.
内容記述
内容記述タイプ Other
内容記述 論文
出版者
言語 en
出版者 The Geochemical Society of Japan
出版者
言語 ja
出版者 日本地球化学会
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/20.500.12000/37847
識別子タイプ HDL
関連情報
識別子タイプ DOI
関連識別子 https://doi.org/10.2343/geochemj.1.0155
関連情報
識別子タイプ DOI
関連識別子 info:doi/10.2343/geochemj.1.0155
収録物識別子
収録物識別子タイプ ISSN
収録物識別子 1880-5973
収録物名
言語 en
収録物名 GEOCHEMICAL JOURNAL
書誌情報
巻 46, 号 2, p. 89-106, 発行日 2012-06
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