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Carbonates occur as both cement (Mg-calcite and aragonite) and vein filling (aragonite). Samples are generally depleted in ^\u003c18\u003eO to a level that is consistent with pore-water chemistry and downhole temperatures as high as 67℃. However, the samples from the upper part of the hole (\u003c300m sub-bottom depth) contain extremely ^\u003c18\u003eO-depleted aragonite, suggesting precipitation from glacier- or ice-sheet-source meteoric water. Carbon isotopic rations of aragonite are enriched in ^\u003c13\u003eC relative to the neighboring Mg-calcite. Low δ^\u003c13\u003eC values of Mg-calcite may be ascribed to precipitation under the sulfate reduction layer where ^\u003c13\u003eC-depleted carbon dioxide might be released. It is plausible, however, that the high δ^\u003c13\u003eC values of aragonite are due to precipitation under the methane fermentation layer or CO_2 reduction layer, which underlay the sulfate reduction layer and produced ^\u003c13\u003eC-enriched carbon dioxide. Semi-micro scale isotopic analyses along two transects of aragonite veins revealed that δ^\u003c13\u003eC values vary from 3 to 5‰ within a vien. Near the bottom of the drillhole, δ^\u003c18\u003eO values in pore water remained constant during the aragonite precipitation. 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ISOTOPIC STUDIES OF CARBONATES FROM CIROS-1 DRILLHOLE, WESTERN McMURDO SOUND, ANTARCTICA
https://doi.org/10.15094/00002629
https://doi.org/10.15094/00002629b95b7fb9-223e-4eae-aacb-9733bb193765
名前 / ファイル | ライセンス | アクション |
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KJ00002368241 (3.2 MB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1990-09-01 | |||||
タイトル | ||||||
タイトル | ISOTOPIC STUDIES OF CARBONATES FROM CIROS-1 DRILLHOLE, WESTERN McMURDO SOUND, ANTARCTICA | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | departmental bulletin paper | |||||
ID登録 | ||||||
ID登録 | 10.15094/00002629 | |||||
ID登録タイプ | JaLC | |||||
ページ属性 | ||||||
内容記述タイプ | Other | |||||
内容記述 | P(論文) | |||||
論文名よみ | ||||||
その他のタイトル | ISOTOPIC STUDIES OF CARBONATES FROM CIROS-1 DRILLHOLE, WESTERN McMURDO SOUND, ANTARCTICA | |||||
著者名よみ |
ワダ, ヒデキ
× ワダ, ヒデキ× オカダ, ハクユウ |
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著者名(英) |
WADA, Hideki
× WADA, Hideki× OKADA, Hakuyu |
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著者所属(英) | ||||||
en | ||||||
Institute of Geosciences, Faculty of Science, Shizuoka University | ||||||
著者所属(英) | ||||||
en | ||||||
Department of Earth and Planetary Sciences, Faculty of Science, Kyushu University | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Carbonates from core samples from the CIROS-1 drillhole, western McMurdo Sound, Antarctica, were analyzed for isotopic, chemical and mineralogical compositions. Carbonates occur as both cement (Mg-calcite and aragonite) and vein filling (aragonite). Samples are generally depleted in ^<18>O to a level that is consistent with pore-water chemistry and downhole temperatures as high as 67℃. However, the samples from the upper part of the hole (<300m sub-bottom depth) contain extremely ^<18>O-depleted aragonite, suggesting precipitation from glacier- or ice-sheet-source meteoric water. Carbon isotopic rations of aragonite are enriched in ^<13>C relative to the neighboring Mg-calcite. Low δ^<13>C values of Mg-calcite may be ascribed to precipitation under the sulfate reduction layer where ^<13>C-depleted carbon dioxide might be released. It is plausible, however, that the high δ^<13>C values of aragonite are due to precipitation under the methane fermentation layer or CO_2 reduction layer, which underlay the sulfate reduction layer and produced ^<13>C-enriched carbon dioxide. Semi-micro scale isotopic analyses along two transects of aragonite veins revealed that δ^<13>C values vary from 3 to 5‰ within a vien. Near the bottom of the drillhole, δ^<18>O values in pore water remained constant during the aragonite precipitation. At shallow depths about 260m below the sea floor, δ^<18>O values in pore water were variable, probably owing to the different contribution of glacier or ice-melt water during the precipitation. | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA1072335X | |||||
書誌情報 |
Proceedings of the NIPR Symposium on Antarctic Geosciences 巻 4, p. 149-164, 発行日 1990-09 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |