Ribbed moraines and subglacial geomorphological signatures of interior-sector palaeo-ice sheet dynamics
Transverse, subglacial bedforms (ribbed moraines) occur frequently in southern Keewatin, Nunavut, Canada, where they record a complex glacial history, including shifting centers of ice dispersal and fluctuating basal thermal regimes. Comprehensive mapping and quantitative morphometric analysis of th...
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ftbrockuniv:oai:dr.library.brocku.ca:10464/6096 2023-07-16T03:59:02+02:00 Ribbed moraines and subglacial geomorphological signatures of interior-sector palaeo-ice sheet dynamics Wagner, Kaleb Department of Earth Sciences 2015-02-24T14:38:56Z http://hdl.handle.net/10464/6096 eng eng Brock University http://hdl.handle.net/10464/6096 ribbed moraines subglacial bedforms spatial analysis Keewatin deforming bed mosaic Electronic Thesis or Dissertation 2015 ftbrockuniv 2023-06-27T22:08:36Z Transverse, subglacial bedforms (ribbed moraines) occur frequently in southern Keewatin, Nunavut, Canada, where they record a complex glacial history, including shifting centers of ice dispersal and fluctuating basal thermal regimes. Comprehensive mapping and quantitative morphometric analysis of the subglacial bedform archive in this sector reveals that ribbed moraines are spatially clustered by size and assume a broad range of visually distinct forms. Results suggest that end-member morphologies are consistent with a dichotomous polygenetic origin, and that a continuum of forms emerged through subsequent reshaping processes of variable intensity and duration. Translocation of mobile, immobile and quasi-mobile beds throughout the last glacial cycle conditioned the development of a subglacial deforming bed mosaic, and is likely responsible for the patchy zonation of palimpsest and inherited landscape signatures within this former core region of the Laurentide Ice Sheet. Comparison against field evidence collected from central Norway suggests that bedforming processes can be locally mediated by pre-existing topography. Thesis Ice Sheet Keewatin Nunavut Brock University Digital Repository Canada Norway Nunavut |
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Open Polar |
collection |
Brock University Digital Repository |
op_collection_id |
ftbrockuniv |
language |
English |
topic |
ribbed moraines subglacial bedforms spatial analysis Keewatin deforming bed mosaic |
spellingShingle |
ribbed moraines subglacial bedforms spatial analysis Keewatin deforming bed mosaic Wagner, Kaleb Ribbed moraines and subglacial geomorphological signatures of interior-sector palaeo-ice sheet dynamics |
topic_facet |
ribbed moraines subglacial bedforms spatial analysis Keewatin deforming bed mosaic |
description |
Transverse, subglacial bedforms (ribbed moraines) occur frequently in southern Keewatin, Nunavut, Canada, where they record a complex glacial history, including shifting centers of ice dispersal and fluctuating basal thermal regimes. Comprehensive mapping and quantitative morphometric analysis of the subglacial bedform archive in this sector reveals that ribbed moraines are spatially clustered by size and assume a broad range of visually distinct forms. Results suggest that end-member morphologies are consistent with a dichotomous polygenetic origin, and that a continuum of forms emerged through subsequent reshaping processes of variable intensity and duration. Translocation of mobile, immobile and quasi-mobile beds throughout the last glacial cycle conditioned the development of a subglacial deforming bed mosaic, and is likely responsible for the patchy zonation of palimpsest and inherited landscape signatures within this former core region of the Laurentide Ice Sheet. Comparison against field evidence collected from central Norway suggests that bedforming processes can be locally mediated by pre-existing topography. |
author2 |
Department of Earth Sciences |
format |
Thesis |
author |
Wagner, Kaleb |
author_facet |
Wagner, Kaleb |
author_sort |
Wagner, Kaleb |
title |
Ribbed moraines and subglacial geomorphological signatures of interior-sector palaeo-ice sheet dynamics |
title_short |
Ribbed moraines and subglacial geomorphological signatures of interior-sector palaeo-ice sheet dynamics |
title_full |
Ribbed moraines and subglacial geomorphological signatures of interior-sector palaeo-ice sheet dynamics |
title_fullStr |
Ribbed moraines and subglacial geomorphological signatures of interior-sector palaeo-ice sheet dynamics |
title_full_unstemmed |
Ribbed moraines and subglacial geomorphological signatures of interior-sector palaeo-ice sheet dynamics |
title_sort |
ribbed moraines and subglacial geomorphological signatures of interior-sector palaeo-ice sheet dynamics |
publisher |
Brock University |
publishDate |
2015 |
url |
http://hdl.handle.net/10464/6096 |
geographic |
Canada Norway Nunavut |
geographic_facet |
Canada Norway Nunavut |
genre |
Ice Sheet Keewatin Nunavut |
genre_facet |
Ice Sheet Keewatin Nunavut |
op_relation |
http://hdl.handle.net/10464/6096 |
_version_ |
1771546473479012352 |