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  1. D300 大学院環境学研究科
  2. D300a 雑誌掲載論文
  3. 学術雑誌

High-precision Δ^′17O measurements of geothermal H2O and MORB on the VSMOW-SLAP scale: evidence for active oxygen exchange between the lithosphere and hydrosphere

http://hdl.handle.net/2237/0002001821
http://hdl.handle.net/2237/0002001821
c26b69e6-ab02-44dc-84e0-21d22ba9c2de
名前 / ファイル ライセンス アクション
55_2_0644.pdf 55_2_0644.pdf (187 KB)
Item type itemtype_ver1(1)
公開日 2022-01-05
タイトル
タイトル High-precision Δ^′17O measurements of geothermal H2O and MORB on the VSMOW-SLAP scale: evidence for active oxygen exchange between the lithosphere and hydrosphere
言語 en
著者 Sambuichi, Takashi

× Sambuichi, Takashi

en Sambuichi, Takashi

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Tsunogai, Urumu

× Tsunogai, Urumu

en Tsunogai, Urumu

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Kura, Kazushige

× Kura, Kazushige

en Kura, Kazushige

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Nakagawa, Fumiko

× Nakagawa, Fumiko

en Nakagawa, Fumiko

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Ohba, Takeshi

× Ohba, Takeshi

en Ohba, Takeshi

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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
キーワード
主題Scheme Other
主題 triple oxygen isotopes
キーワード
主題Scheme Other
主題 geothermal H2O
キーワード
主題Scheme Other
主題 MORB
キーワード
主題Scheme Other
主題 VSMOW-SLAP scale
キーワード
主題Scheme Other
主題 rock-water interaction
内容記述
内容記述 Recent studies have reported slight but definite differences in Δ^′17O between the lithosphere and hydrosphere. In the present study, we precisely and accurately quantify the Δ^′17O values of geothermal H2O and mid-ocean ridge basalt (MORB) with normalization on the VSMOW-SLAP scale to further substantiate these differences and to discuss the isotopic evolution of the hydrosphere throughout the geologic time scale. With a Δ^′17O value of -60 ± 13 × 10^-6, the Δ^′17O value of MORB is comparable with that in other silicates reported in previous studies. However, the Δ^′17O value of geothermal H2O tended to decrease from +31 × 10^-6 to -51 × 10^-6, which are the usual Δ^′17O values in meteoric water and silicates, respectively, in accordance with the 18O-enrichment. These results imply an active oxygen isotope exchange between silicates and geothermal H2O under high-temperature conditions at depth. This is supported by previous studies which report the 17O-enrichment of silicate altered by hydrothermal H2O. Considering this direct evidence for depletion of 17O, we conclude that the 17O-depleted H2O has been supplied continuously to the hydrosphere. Additionally, low-temperature interaction between the silicates and H2O besides high-temperature hydrothermal interaction must be assumed to explain the observed Δ^′17O of the terrestrial hydrosphere. We conclude that the Δ^′17O of the terrestrial hydrosphere should have been variable throughout the geologic time scale owing to the various oxygen exchange interaction between the lithosphere and hydrosphere.
言語 en
内容記述タイプ Abstract
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resource http://purl.org/coar/resource_type/c_6501
タイプ journal article
出版タイプ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
関連情報
関連タイプ isVersionOf
識別子タイプ DOI
関連識別子 https://doi.org/10.2343/geochemj.2.0644
収録物識別子
収録物識別子タイプ PISSN
収録物識別子 0016-7002
書誌情報 en : GEOCHEMICAL JOURNAL

巻 55, 号 6, p. e25-e33, 発行日 2021
ファイル公開日
日付 2022-01-05
日付タイプ Available
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