Basal ice accretion and debris entrainment within the coastal ice margin, Law Dome, Antarctica
Abstract Basal ice stratigraphy in coastal ice cliffs at the Law Dome margin has revealed the basal accretion of clean and debris-bearing ice, marine congelation ice and granular marine ice inland of the margin. Co-isotopic analysis of δ 18 O and δD isotopes together with solute chemistry were appli...
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Cambridge University Press (CUP)
1993
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Online Access: | http://dx.doi.org/10.1017/s002214300001580x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002214300001580X |
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crcambridgeupr:10.1017/s002214300001580x 2024-09-15T17:48:40+00:00 Basal ice accretion and debris entrainment within the coastal ice margin, Law Dome, Antarctica Goodwin, Ian D. 1993 http://dx.doi.org/10.1017/s002214300001580x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002214300001580X en eng Cambridge University Press (CUP) Journal of Glaciology volume 39, issue 131, page 157-166 ISSN 0022-1430 1727-5652 journal-article 1993 crcambridgeupr https://doi.org/10.1017/s002214300001580x 2024-07-31T04:04:10Z Abstract Basal ice stratigraphy in coastal ice cliffs at the Law Dome margin has revealed the basal accretion of clean and debris-bearing ice, marine congelation ice and granular marine ice inland of the margin. Co-isotopic analysis of δ 18 O and δD isotopes together with solute chemistry were applied to determine the modes of accretion and debris entrainment. The marine congelation ice and the granular marine ice were formed from the basal freezing of desalinated sea water and the episodic mixture of basal meltwater and sea water, respectively. Two different debris-entrainment mechanisms were identified. Debris-band ice with debris concentrations of 6.3–33% (by volume) was formed from proglacial raised beach and shallow marine sediment incorporated by an over-riding advance of the margin. Two other debris-bearing ice types, dispersed debris-poor ice with debris concentrations <0.3% (by volume) and laminated debris ice with debris concentrations 0.9–1.9% (by volume) were accreted further inland from the margin by basal regelation processes associated with the Robin (1976) heat-pump effect. Article in Journal/Newspaper Antarc* Antarctica Journal of Glaciology Cambridge University Press Journal of Glaciology 39 131 157 166 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract Basal ice stratigraphy in coastal ice cliffs at the Law Dome margin has revealed the basal accretion of clean and debris-bearing ice, marine congelation ice and granular marine ice inland of the margin. Co-isotopic analysis of δ 18 O and δD isotopes together with solute chemistry were applied to determine the modes of accretion and debris entrainment. The marine congelation ice and the granular marine ice were formed from the basal freezing of desalinated sea water and the episodic mixture of basal meltwater and sea water, respectively. Two different debris-entrainment mechanisms were identified. Debris-band ice with debris concentrations of 6.3–33% (by volume) was formed from proglacial raised beach and shallow marine sediment incorporated by an over-riding advance of the margin. Two other debris-bearing ice types, dispersed debris-poor ice with debris concentrations <0.3% (by volume) and laminated debris ice with debris concentrations 0.9–1.9% (by volume) were accreted further inland from the margin by basal regelation processes associated with the Robin (1976) heat-pump effect. |
format |
Article in Journal/Newspaper |
author |
Goodwin, Ian D. |
spellingShingle |
Goodwin, Ian D. Basal ice accretion and debris entrainment within the coastal ice margin, Law Dome, Antarctica |
author_facet |
Goodwin, Ian D. |
author_sort |
Goodwin, Ian D. |
title |
Basal ice accretion and debris entrainment within the coastal ice margin, Law Dome, Antarctica |
title_short |
Basal ice accretion and debris entrainment within the coastal ice margin, Law Dome, Antarctica |
title_full |
Basal ice accretion and debris entrainment within the coastal ice margin, Law Dome, Antarctica |
title_fullStr |
Basal ice accretion and debris entrainment within the coastal ice margin, Law Dome, Antarctica |
title_full_unstemmed |
Basal ice accretion and debris entrainment within the coastal ice margin, Law Dome, Antarctica |
title_sort |
basal ice accretion and debris entrainment within the coastal ice margin, law dome, antarctica |
publisher |
Cambridge University Press (CUP) |
publishDate |
1993 |
url |
http://dx.doi.org/10.1017/s002214300001580x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002214300001580X |
genre |
Antarc* Antarctica Journal of Glaciology |
genre_facet |
Antarc* Antarctica Journal of Glaciology |
op_source |
Journal of Glaciology volume 39, issue 131, page 157-166 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s002214300001580x |
container_title |
Journal of Glaciology |
container_volume |
39 |
container_issue |
131 |
container_start_page |
157 |
op_container_end_page |
166 |
_version_ |
1810290147887939584 |