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Formation processes of basal ice at Hamna Glacier, Sôya Coast, East Antarctica, inferred by detailed co-isotopic analyses

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タイトル: Formation processes of basal ice at Hamna Glacier, Sôya Coast, East Antarctica, inferred by detailed co-isotopic analyses
著者: Iizuka, Yoshinori 著作を一覧する
Satake, Hiroshi 著作を一覧する
Shiraiwa, Takayuki 著作を一覧する
Naruse, Renji 著作を一覧する
発行日: 2001年 3月
出版者: International Glaciological Society
誌名: Journal of Glaciology
巻: 47
号: 157
開始ページ: 223
終了ページ: 231
出版社 DOI: 10.3189/172756501781832359
抄録: Debris-laden basal ice is exposed along an ice cliff near Hamna Glacier, Sôya Coast, East Antarctica. The basal ice is about 6.8m thick and shows conspicuous stratigraphic features. The upper 5.5m consists of alternating layers of bubble-free and bubbly ice. δ values of the bubble-free ice layers are enriched by 2.4 ± 1.0‰ (standard deviation) for δ18O compared to values of neighboring bubbly ice layers above, and slopes of δ18O vs δD are close to 8. Such layers are suggested to have been formed by refreezing of meltwater in an open system. In contrast, part of the bubbly ice layers shows neutral profiles for stable isotopes, suggesting that these ice masses are undisturbed ice-sheet ice which was not affected by melting and freezing. The massive alternating layers are thus considered to have been formed by folding of refrozen and non-melted layers. The lower 1.3m consists predominantly of bubble-free massive ice. The profile of co-isotopic values shows a change of about 3.0‰ for δ18O at the interface between bubble-free and bubbly ice. Since the isotopic change occurred over a wider thickness than the upper 5.5m, the basal ice is suggested to have been formed by refreezing of meltwater on a larger scale than the upper 5.5m.
Rights: © 2001 International Glaciological Society
Relation (URI): http://www.igsoc.org/
資料タイプ: article
URI: http://hdl.handle.net/2115/39471
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 飯塚 芳徳

 

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