An investigation of the debris-rich basal ice from Worthington Glacier, Alaska, U.S.A.
Abstract This paper examines the debris-rich basal ice layer from Worthington Glacier, Alaska, U.S.A., a small valley glacier overlying rigid bedrock. The debris-rich basal ice layer studied shows evidence for large-scale longitudinal compressive deformation (isoclinal folds and nappes), similar in...
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Language: | English |
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Cambridge University Press (CUP)
1999
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Online Access: | http://dx.doi.org/10.1017/s0022143000003038 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000003038 |
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crcambridgeupr:10.1017/s0022143000003038 2024-04-07T07:52:35+00:00 An investigation of the debris-rich basal ice from Worthington Glacier, Alaska, U.S.A. Hart, Jane K. Waller, Richard I. 1999 http://dx.doi.org/10.1017/s0022143000003038 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000003038 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Journal of Glaciology volume 45, issue 149, page 54-62 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1999 crcambridgeupr https://doi.org/10.1017/s0022143000003038 2024-03-08T00:35:31Z Abstract This paper examines the debris-rich basal ice layer from Worthington Glacier, Alaska, U.S.A., a small valley glacier overlying rigid bedrock. The debris-rich basal ice layer studied shows evidence for large-scale longitudinal compressive deformation (isoclinal folds and nappes), similar in style and magnitude features to that reported from push moraines formed in glacial sediments. The debris-rich ice largely comprised stratified solid ice (layers of alternating debris-rich and debris-poor ice) which we suggest results from the tectonic attenuation of folds produced from the deformation of the frozen debris, glacier ice and bubble-rich ice that comprise the initial basal layer of Worthington Glacier. Beneath the glacier lies a thin bed of saturated diamicton which contains evidence of limited movement. It is suggested that this is the result of the partial melt-out of the debris-rich basal ice layer which then behaved as a local (and seasonal) thin deforming layer. It is suggested that this example, from a valley glacier flowing over rigid bedrock, provides further evidence that the processes of sediment transport, incorporation and deposition in the debris-rich basal ice are similar to and linked with those in the deforming layer. Article in Journal/Newspaper glacier Journal of Glaciology Alaska Cambridge University Press Journal of Glaciology 45 149 54 62 |
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Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Hart, Jane K. Waller, Richard I. An investigation of the debris-rich basal ice from Worthington Glacier, Alaska, U.S.A. |
topic_facet |
Earth-Surface Processes |
description |
Abstract This paper examines the debris-rich basal ice layer from Worthington Glacier, Alaska, U.S.A., a small valley glacier overlying rigid bedrock. The debris-rich basal ice layer studied shows evidence for large-scale longitudinal compressive deformation (isoclinal folds and nappes), similar in style and magnitude features to that reported from push moraines formed in glacial sediments. The debris-rich ice largely comprised stratified solid ice (layers of alternating debris-rich and debris-poor ice) which we suggest results from the tectonic attenuation of folds produced from the deformation of the frozen debris, glacier ice and bubble-rich ice that comprise the initial basal layer of Worthington Glacier. Beneath the glacier lies a thin bed of saturated diamicton which contains evidence of limited movement. It is suggested that this is the result of the partial melt-out of the debris-rich basal ice layer which then behaved as a local (and seasonal) thin deforming layer. It is suggested that this example, from a valley glacier flowing over rigid bedrock, provides further evidence that the processes of sediment transport, incorporation and deposition in the debris-rich basal ice are similar to and linked with those in the deforming layer. |
format |
Article in Journal/Newspaper |
author |
Hart, Jane K. Waller, Richard I. |
author_facet |
Hart, Jane K. Waller, Richard I. |
author_sort |
Hart, Jane K. |
title |
An investigation of the debris-rich basal ice from Worthington Glacier, Alaska, U.S.A. |
title_short |
An investigation of the debris-rich basal ice from Worthington Glacier, Alaska, U.S.A. |
title_full |
An investigation of the debris-rich basal ice from Worthington Glacier, Alaska, U.S.A. |
title_fullStr |
An investigation of the debris-rich basal ice from Worthington Glacier, Alaska, U.S.A. |
title_full_unstemmed |
An investigation of the debris-rich basal ice from Worthington Glacier, Alaska, U.S.A. |
title_sort |
investigation of the debris-rich basal ice from worthington glacier, alaska, u.s.a. |
publisher |
Cambridge University Press (CUP) |
publishDate |
1999 |
url |
http://dx.doi.org/10.1017/s0022143000003038 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000003038 |
genre |
glacier Journal of Glaciology Alaska |
genre_facet |
glacier Journal of Glaciology Alaska |
op_source |
Journal of Glaciology volume 45, issue 149, page 54-62 ISSN 0022-1430 1727-5652 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0022143000003038 |
container_title |
Journal of Glaciology |
container_volume |
45 |
container_issue |
149 |
container_start_page |
54 |
op_container_end_page |
62 |
_version_ |
1795667992619515904 |