A Framework for the Investigation of Medial Moraine Formation: Austerdalsbreen, Norway, and Berendon Glacier, British Columbia, Canada
Abstract Morphology of medial moraines on Austerdalsbreen, Norway, and Berendon Glacier, British Columbia, depends upon englacial debris supply. Major sub-types of this "ablation-dominant" model are related to the zone of debris entrainment relative to the firn line, and the manner of entr...
Published in: | Journal of Glaciology |
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Language: | English |
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Cambridge University Press (CUP)
1978
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Online Access: | http://dx.doi.org/10.1017/s0022143000021249 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000021249 |
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crcambridgeupr:10.1017/s0022143000021249 2024-09-15T18:07:51+00:00 A Framework for the Investigation of Medial Moraine Formation: Austerdalsbreen, Norway, and Berendon Glacier, British Columbia, Canada Eyles, N. Rogerson, R. J. 1978 http://dx.doi.org/10.1017/s0022143000021249 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000021249 en eng Cambridge University Press (CUP) Journal of Glaciology volume 20, issue 82, page 99-113 ISSN 0022-1430 1727-5652 journal-article 1978 crcambridgeupr https://doi.org/10.1017/s0022143000021249 2024-07-31T04:04:38Z Abstract Morphology of medial moraines on Austerdalsbreen, Norway, and Berendon Glacier, British Columbia, depends upon englacial debris supply. Major sub-types of this "ablation-dominant" model are related to the zone of debris entrainment relative to the firn line, and the manner of entrainment. On Austerdalsbreen, debris derived from extraglacial bedrock slopes is entrained via crevasses at the confluence of two ice-cap outlet glaciers below the firn line. Revelation of crevasse-bound debris generates a distinct ice-cored morphology which is destroyed as crevasse bottoms are revealed down-glacier. On Berendon Glacier ice streams coalesce above and below the firn line. Above the firn line, debris from extraglacial rock outcrops, subnival and subglacial zones, undergoes seasonal sedimentation with snowfall, and extends throughout the ice depth. Distinct moraine morphology in the terminal zone is related to continuing debris supply. Most debris is transported at depth near the glacier base. An "ice-stream interaction" model where medial moraines formed below the firn line from the confluence of ice streams with large lateral moraine load are morphologically controlled by flow, explains morphology on the Berendon Glacier in the main confluence zone only. Down-glacier, this moraine becomes "ablation dominant". A minor "avalanche-type" model is also recognized. Article in Journal/Newspaper glacier Ice cap Journal of Glaciology Cambridge University Press Journal of Glaciology 20 82 99 113 |
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Open Polar |
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Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
Abstract Morphology of medial moraines on Austerdalsbreen, Norway, and Berendon Glacier, British Columbia, depends upon englacial debris supply. Major sub-types of this "ablation-dominant" model are related to the zone of debris entrainment relative to the firn line, and the manner of entrainment. On Austerdalsbreen, debris derived from extraglacial bedrock slopes is entrained via crevasses at the confluence of two ice-cap outlet glaciers below the firn line. Revelation of crevasse-bound debris generates a distinct ice-cored morphology which is destroyed as crevasse bottoms are revealed down-glacier. On Berendon Glacier ice streams coalesce above and below the firn line. Above the firn line, debris from extraglacial rock outcrops, subnival and subglacial zones, undergoes seasonal sedimentation with snowfall, and extends throughout the ice depth. Distinct moraine morphology in the terminal zone is related to continuing debris supply. Most debris is transported at depth near the glacier base. An "ice-stream interaction" model where medial moraines formed below the firn line from the confluence of ice streams with large lateral moraine load are morphologically controlled by flow, explains morphology on the Berendon Glacier in the main confluence zone only. Down-glacier, this moraine becomes "ablation dominant". A minor "avalanche-type" model is also recognized. |
format |
Article in Journal/Newspaper |
author |
Eyles, N. Rogerson, R. J. |
spellingShingle |
Eyles, N. Rogerson, R. J. A Framework for the Investigation of Medial Moraine Formation: Austerdalsbreen, Norway, and Berendon Glacier, British Columbia, Canada |
author_facet |
Eyles, N. Rogerson, R. J. |
author_sort |
Eyles, N. |
title |
A Framework for the Investigation of Medial Moraine Formation: Austerdalsbreen, Norway, and Berendon Glacier, British Columbia, Canada |
title_short |
A Framework for the Investigation of Medial Moraine Formation: Austerdalsbreen, Norway, and Berendon Glacier, British Columbia, Canada |
title_full |
A Framework for the Investigation of Medial Moraine Formation: Austerdalsbreen, Norway, and Berendon Glacier, British Columbia, Canada |
title_fullStr |
A Framework for the Investigation of Medial Moraine Formation: Austerdalsbreen, Norway, and Berendon Glacier, British Columbia, Canada |
title_full_unstemmed |
A Framework for the Investigation of Medial Moraine Formation: Austerdalsbreen, Norway, and Berendon Glacier, British Columbia, Canada |
title_sort |
framework for the investigation of medial moraine formation: austerdalsbreen, norway, and berendon glacier, british columbia, canada |
publisher |
Cambridge University Press (CUP) |
publishDate |
1978 |
url |
http://dx.doi.org/10.1017/s0022143000021249 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000021249 |
genre |
glacier Ice cap Journal of Glaciology |
genre_facet |
glacier Ice cap Journal of Glaciology |
op_source |
Journal of Glaciology volume 20, issue 82, page 99-113 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000021249 |
container_title |
Journal of Glaciology |
container_volume |
20 |
container_issue |
82 |
container_start_page |
99 |
op_container_end_page |
113 |
_version_ |
1810445215335448576 |