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 |
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タイトル |
Hydrothermal fluid geochemistry at the Iheya North field in the mid-Okinawa Trough: Implication for origin of methane in subseafloor fluid circulation systems |
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言語 |
en |
作成者 |
Kawaguchi, Shinsuke
Chiba, Hitoshi
Ishibashi, Jun-ichiro
Yamanaka, Toshihiro
Toki, Tomohiro
Muramatsu, Yasuyuki
Ueno, Yuichiro
Makabe, Akiko
Inoue, Kazuhiro
Yoshida, Naohiro
Nakagawa, Satoshi
Nonoura, Takuro
Takai, Ken
Takahata, Naoto
Sano, Yuji
Narita, Taku
Teranishi, Genta
Obata, Hajime
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 |
主題 |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
origin of methane |
主題 |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
sediment-associated hydrothermal field |
主題 |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
Iheya North hydrothermal field |
主題 |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
Okinawa Trough |
主題 |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
hydrothermal fluid geochemistry |
内容記述 |
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内容記述タイプ |
Other |
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内容記述 |
Geochemical characteristics of hydrothermal fluids in the Iheya North hydrothermal field, mid-Okinawa Trough, was investigated. Twelve-years observation reveals temporal variation of vent fluid chemistry potentially controlled by temporally varying pattern of the phase-separation and -segregation, while the constant Element/Cl ratios among the periods and chimneys indicate the stable chemical composition of the source hydrothermal fluid prior to undergoing phase-separation. The high K contents in the estimated source fluid are typical in the arc-backarc hydrothermal systems due to the hydrothermal reaction with the K-enriched felsic rocks. The high I, B and NH4 contents and alkalinity are derived from decomposition of the sedimentary organic matters. Compositional and isotopic properties of gas species, CH4, H2, CO2, and C2H6, strongly suggest a dominance of biogenic CH4 associated with the sedimentary organic matter. Based on the carbon mass balance calculation and the multidisciplinary investigations of the Iheya North hydrothermal system since the discovery, we hypothesized that the microbial methanogenesis occurs not only within the Central Valley where hydrothermal vents exist, but also in the spatially abundant and widespread basin-filling sediments surrounding the Iheya North Knoll, and that the microbially produced CH4 is recharged together with the source fluid into the deep hydrothermal reaction zone. This “Microbial Methanogenesis at Recharge area in hydrothermal circulation” (MMR) model would be an implication for the generation and incorporation of hydrothermal fluid CH4 in the deep-sea hydrothermal systems but also for those of cold seep CH4 and for the presently uncertain hydrothermal fluid paths in the subseafloor environments. In the near future, the IODP drilling will be conducted in the Iheya North hydrothermal system, and give an excellent opportunity to testify our MMR model. |
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 |
The Geochemical Society of Japan |
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/20.500.12000/37848 |
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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/10.2343/geochemj.1.0105 |
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/10.2343/geochemj.1.0105 |
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 |
1880-5973 |
収録物名 |
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言語 |
en |
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収録物名 |
Geochemical Journal |
書誌情報 |
巻 45,
号 2,
p. 109-124,
発行日 2011-06
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