Large-scale reorganization and sedimentation of terrestrial ice streams during late Wisconsinan Laurentide Ice Sheet deglaciation.
Glacial geomorphological mapping of Shuttle Radar Topography Mission (SRTM) data from the western Canadian Prairies demonstrates that during the last (late Wisconsinan)deglaciation of the Laurentide Ice Sheet terrestrial ice streams underwent a major reorganization of their flow configuration. This...
Published in: | Geological Society of America Bulletin |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
Geological Society of America
2010
|
Subjects: | |
Online Access: | http://dro.dur.ac.uk/6779/ https://doi.org/10.1130/B26476.1 |
id |
ftunivdurham:oai:dro.dur.ac.uk.OAI2:6779 |
---|---|
record_format |
openpolar |
spelling |
ftunivdurham:oai:dro.dur.ac.uk.OAI2:6779 2023-05-15T16:40:31+02:00 Large-scale reorganization and sedimentation of terrestrial ice streams during late Wisconsinan Laurentide Ice Sheet deglaciation. Ó Cofaigh, C. Evans, D. J. A. Smith, I. R. 2010-05-01 http://dro.dur.ac.uk/6779/ https://doi.org/10.1130/B26476.1 unknown Geological Society of America dro:6779 issn:0016-7606 issn: 1943-2674 doi:10.1130/B26476.1 http://dro.dur.ac.uk/6779/ http://dx.doi.org/10.1130/B26476.1 Geological Society of America bulletin, 2010, Vol.122(5-6), pp.743-756 [Peer Reviewed Journal] Article PeerReviewed 2010 ftunivdurham https://doi.org/10.1130/B26476.1 2020-05-28T22:27:47Z Glacial geomorphological mapping of Shuttle Radar Topography Mission (SRTM) data from the western Canadian Prairies demonstrates that during the last (late Wisconsinan)deglaciation of the Laurentide Ice Sheet terrestrial ice streams underwent a major reorganization of their flow configuration. This reorganization involved a 90° shift in flow direction and was accompanied by a corresponding increase in the influence of topography on streaming flow. Ice streams included both topographically confined and “pure” ice streams that flowed independent of topography. Streaming flow is recorded by suites of highly elongate (>60 km long) subglacial bedforms, bounded sharply at their lateral margins by prominent moraines. Initial streaming flow was unconfined by topography but was replaced progressively, and crosscut, by younger topographically confined flows. Flow reorganization is inferred to have been caused by temporal and spatial variations in the interaction between frozen and thawed bed conditions, with thinning and shutdown of one ice stream ultimately triggering initiation of others. This highlights the role of internal glaciodynamically driven reorganization in triggering streaming fl ow within large ice sheets and shows that large-scale fl ow reorganization can occur over the time scale of a single deglaciation in terrestrial ice streams. Article in Journal/Newspaper Ice Sheet Durham University: Durham Research Online Geological Society of America Bulletin 122 5-6 743 756 |
institution |
Open Polar |
collection |
Durham University: Durham Research Online |
op_collection_id |
ftunivdurham |
language |
unknown |
description |
Glacial geomorphological mapping of Shuttle Radar Topography Mission (SRTM) data from the western Canadian Prairies demonstrates that during the last (late Wisconsinan)deglaciation of the Laurentide Ice Sheet terrestrial ice streams underwent a major reorganization of their flow configuration. This reorganization involved a 90° shift in flow direction and was accompanied by a corresponding increase in the influence of topography on streaming flow. Ice streams included both topographically confined and “pure” ice streams that flowed independent of topography. Streaming flow is recorded by suites of highly elongate (>60 km long) subglacial bedforms, bounded sharply at their lateral margins by prominent moraines. Initial streaming flow was unconfined by topography but was replaced progressively, and crosscut, by younger topographically confined flows. Flow reorganization is inferred to have been caused by temporal and spatial variations in the interaction between frozen and thawed bed conditions, with thinning and shutdown of one ice stream ultimately triggering initiation of others. This highlights the role of internal glaciodynamically driven reorganization in triggering streaming fl ow within large ice sheets and shows that large-scale fl ow reorganization can occur over the time scale of a single deglaciation in terrestrial ice streams. |
format |
Article in Journal/Newspaper |
author |
Ó Cofaigh, C. Evans, D. J. A. Smith, I. R. |
spellingShingle |
Ó Cofaigh, C. Evans, D. J. A. Smith, I. R. Large-scale reorganization and sedimentation of terrestrial ice streams during late Wisconsinan Laurentide Ice Sheet deglaciation. |
author_facet |
Ó Cofaigh, C. Evans, D. J. A. Smith, I. R. |
author_sort |
Ó Cofaigh, C. |
title |
Large-scale reorganization and sedimentation of terrestrial ice streams during late Wisconsinan Laurentide Ice Sheet deglaciation. |
title_short |
Large-scale reorganization and sedimentation of terrestrial ice streams during late Wisconsinan Laurentide Ice Sheet deglaciation. |
title_full |
Large-scale reorganization and sedimentation of terrestrial ice streams during late Wisconsinan Laurentide Ice Sheet deglaciation. |
title_fullStr |
Large-scale reorganization and sedimentation of terrestrial ice streams during late Wisconsinan Laurentide Ice Sheet deglaciation. |
title_full_unstemmed |
Large-scale reorganization and sedimentation of terrestrial ice streams during late Wisconsinan Laurentide Ice Sheet deglaciation. |
title_sort |
large-scale reorganization and sedimentation of terrestrial ice streams during late wisconsinan laurentide ice sheet deglaciation. |
publisher |
Geological Society of America |
publishDate |
2010 |
url |
http://dro.dur.ac.uk/6779/ https://doi.org/10.1130/B26476.1 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Geological Society of America bulletin, 2010, Vol.122(5-6), pp.743-756 [Peer Reviewed Journal] |
op_relation |
dro:6779 issn:0016-7606 issn: 1943-2674 doi:10.1130/B26476.1 http://dro.dur.ac.uk/6779/ http://dx.doi.org/10.1130/B26476.1 |
op_doi |
https://doi.org/10.1130/B26476.1 |
container_title |
Geological Society of America Bulletin |
container_volume |
122 |
container_issue |
5-6 |
container_start_page |
743 |
op_container_end_page |
756 |
_version_ |
1766030922055942144 |