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  1. 学術雑誌論文
  2. その他
  1. 部局別インデックス
  2. 理学部

Isotopic variation of molecular hydrogen in 20°–375°C hydrothermal fluids as detected by a new analytical method

http://hdl.handle.net/20.500.12000/37628
http://hdl.handle.net/20.500.12000/37628
884b27eb-a46d-423c-b77e-79d01661d52b
名前 / ファイル ライセンス アクション
vol115g3.pdf vol115g3.pdf
Item type デフォルトアイテムタイプ(フル)(1)
公開日 2018-01-30
タイトル
タイトル Isotopic variation of molecular hydrogen in 20°–375°C hydrothermal fluids as detected by a new analytical method
言語 ja
作成者 Kawagucci, Shinsuke

× Kawagucci, Shinsuke

en Kawagucci, Shinsuke

Toki, Tomohiro

× Toki, Tomohiro

en Toki, Tomohiro

Ishibashi, Junichiro

× Ishibashi, Junichiro

en Ishibashi, Junichiro

Takai, Ken

× Takai, Ken

en Takai, Ken

Ito, Michihiro

× Ito, Michihiro

en Ito, Michihiro

Oomori, Tamotsu

× Oomori, Tamotsu

en Oomori, Tamotsu

Gamo, Toshitaka

× Gamo, Toshitaka

en Gamo, Toshitaka

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 ©2010. American Geophysical Union.
内容記述
内容記述タイプ Other
内容記述 [1] Molecular hydrogen (H2) is one of the most important energy sources for subseafloor chemolithoautotrophic microbial ecosystems in the deep-sea hydrothermal environments. This study investigated stable isotope ratios of H2 in 20°–375°C hydrothermal fluids to evaluate usefulness of the isotope ratio as a tracer to explore the H2-metabolisms. Prior to the observation, we developed an improved analytical method for the determination of concentration and stable isotope ratio of H2. This method achieved a relatively high sensitivity with a detection limit of 1 nmol H2 within an analytical error of 10‰ in the δDH2 value. The δDH2 values in the high-temperature fluids were between −405‰ and −330‰, indicating the achievement of the hydrogen isotopic equilibrium between H2 and H2O at around the hydrothermal end-member temperature. In contrast, several low-temperature fluids showed apparently smaller δDH2 values than those in the high-temperature fluids in spite of a negligible δDH2 change due to fluid-seawater mixing, suggesting the possibility of δDH2 change in the low-temperature fluids and the surrounding environments. Since the δDH2 change in low-temperature environments is not well explained by the very sluggish abiotic thermal isotopic equilibrium between H2 and H2O, it could be associated with (micro)biological H2-consuming and/or H2-generating metabolisms that would strongly promote the isotopic equilibrium at low temperatures. Our first detection of the δDH2 variation in deep-sea hydrothermal systems presents the availability of the δDH2 value as a new tracer for microbes whose enzymes catalyze D/H exchange in H2.
内容記述タイプ Other
内容記述 論文
出版者
言語 en
出版者 American Geophysical Union
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/20.500.12000/37628
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/10.1029/2009JG001203
関連識別子
識別子タイプ DOI
関連識別子 info:doi/10.1029/2009JG001203
収録物識別子
収録物識別子タイプ ISSN
収録物識別子 2156-2202
収録物名
言語 en
収録物名 Journal of Geophysical Research: Biogeosciences
書誌情報
巻 115, 号 G3
学位授与年月日
学位授与年月日 2010-08-28
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