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 |
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タイトル |
Isotopic variation of molecular hydrogen in 20°–375°C hydrothermal fluids as detected by a new analytical method |
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言語 |
ja |
作成者 |
Kawagucci, Shinsuke
Toki, Tomohiro
Ishibashi, Junichiro
Takai, Ken
Ito, Michihiro
Oomori, Tamotsu
Gamo, Toshitaka
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アクセス権 |
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アクセス権 |
open access |
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アクセス権URI |
http://purl.org/coar/access_right/c_abf2 |
権利情報 |
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言語 |
ja |
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権利情報 |
©2010. American Geophysical Union. |
内容記述 |
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内容記述タイプ |
Other |
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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 |
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内容記述タイプ |
Other |
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内容記述 |
論文 |
出版者 |
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言語 |
en |
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出版者 |
American Geophysical Union |
言語 |
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言語 |
eng |
資源タイプ |
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資源タイプ |
journal article |
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資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
出版タイプ |
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出版タイプ |
VoR |
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出版タイプResource |
http://purl.org/coar/version/c_970fb48d4fbd8a85 |
識別子 |
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識別子 |
http://hdl.handle.net/20.500.12000/37628 |
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識別子タイプ |
HDL |
関連情報 |
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識別子タイプ |
DOI |
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関連識別子 |
https://doi.org/10.1029/2009JG001203 |
関連情報 |
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識別子タイプ |
DOI |
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関連識別子 |
info:doi/10.1029/2009JG001203 |
収録物識別子 |
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収録物識別子タイプ |
ISSN |
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収録物識別子 |
2156-2202 |
収録物名 |
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言語 |
en |
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収録物名 |
Journal of Geophysical Research: Biogeosciences |
書誌情報 |
巻 115,
号 G3,
p. none,
発行日 2010-08-28
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学位授与年月日 |
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学位授与年月日 |
2010-08-28 |