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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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Title: Formation processes of basal ice at Hamna Glacier, Sôya Coast, East Antarctica, inferred by detailed co-isotopic analyses
Authors: Iizuka, Yoshinori Browse this author →KAKEN DB
Satake, Hiroshi Browse this author
Shiraiwa, Takayuki Browse this author →KAKEN DB
Naruse, Renji Browse this author
Issue Date: Mar-2001
Publisher: International Glaciological Society
Journal Title: Journal of Glaciology
Volume: 47
Issue: 157
Start Page: 223
End Page: 231
Publisher DOI: 10.3189/172756501781832359
Abstract: 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: http://www.igsoc.org/
Type: article
URI: http://hdl.handle.net/2115/39471
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 飯塚 芳徳

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