Palaeo-ice streams in the north-eastern Laurentide Ice Sheet
This thesis presents a palaeoglaciological study aimed to determine the location, geometry and temporal evolution of palaeo-ice streams of the north-easternmost Laurentide Ice Sheet. The work was accomplished through the geomorphological interpretation of satellite imagery over 3.19 x 106 km2 of the...
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ftdatacite:10.6084/m9.figshare.825392.v2 2023-05-15T15:17:34+02:00 Palaeo-ice streams in the north-eastern Laurentide Ice Sheet Angelis, Hernán De 2015 https://dx.doi.org/10.6084/m9.figshare.825392.v2 https://figshare.com/articles/journal_contribution/PALAEO_ICE_STREAMS_IN_THE_NORTH_EASTERN_LAURENTIDE_ICE_SHEET/825392/2 unknown figshare https://dx.doi.org/10.6084/m9.figshare.825392 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY Geology FOS Earth and related environmental sciences Physical Geography 40602 Glaciology Text article-journal Journal contribution ScholarlyArticle 2015 ftdatacite https://doi.org/10.6084/m9.figshare.825392.v2 https://doi.org/10.6084/m9.figshare.825392 2021-11-05T12:55:41Z This thesis presents a palaeoglaciological study aimed to determine the location, geometry and temporal evolution of palaeo-ice streams of the north-easternmost Laurentide Ice Sheet. The work was accomplished through the geomorphological interpretation of satellite imagery over 3.19 x 106 km2 of the Canadian Arctic, using a glaciological inversion scheme. Ice streams were active in this region during most of the time between the Last Glacial Maximum and the last deglaciation. A web of ice streams and inter-ice stream areas existed. Three major ice stream networks are identified: the M'Clintock Channel, Gulf of Boothia – Lancaster Sound and Hudson Strait. The M'Clintock Channel bears the most complex landform record, comprising three generations of palaeo-ice streams. Their location was weakly controlled by the subglacial topography and their geometry was determined by frozen-bed portions of the ice sheet, thus providing evidence for pure ice streams in the Laurentide Ice Sheet. In contrast, the more pronounced relief of the Gulf of Boothia – Lancaster Sound corridor supported topographically controlled ice streams. The landform record on emerged land along Hudson Strait is insufficient to support the existence of ice streams. It is therefore proposed that ice streams were constrained within the deep parts of the strait while flanked by cold-based zones on the margins. Small transient ice streams on Baffin and Prince of Wales islands drained local remnant ice caps during the collapse of the ice sheet. Analysis of the controls on the location and flow of palaeo-ice streams suggests that the interaction between the subglacial topography and thermal state of the substrate plays a more fundamental role than the geology. It is concluded that the behaviour of ice streams cannot be explained in terms of environmental controls alone, but the complex dynamics of ice stream shear margins and onset zones must be considered. Citation:De Angelis, Hernán. 2007. "Palaeo-ice streams in the north-eastern Laurentide Ice Sheet." Doctoral dissertation, Stockholms University. doi: 10.6084/m9.figshare.825392 Text Arctic Baffin Hudson Strait Ice Sheet Lancaster Sound DataCite Metadata Store (German National Library of Science and Technology) Arctic Hudson Hudson Strait ENVELOPE(-70.000,-70.000,62.000,62.000) Lancaster Sound ENVELOPE(-83.999,-83.999,74.218,74.218) Hernán ENVELOPE(-62.867,-62.867,-64.900,-64.900) M'Clintock ENVELOPE(-94.214,-94.214,57.802,57.802) Gulf of Boothia ENVELOPE(-90.657,-90.657,70.719,70.719) M'Clintock Channel ENVELOPE(-102.002,-102.002,72.001,72.001) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Geology FOS Earth and related environmental sciences Physical Geography 40602 Glaciology |
spellingShingle |
Geology FOS Earth and related environmental sciences Physical Geography 40602 Glaciology Angelis, Hernán De Palaeo-ice streams in the north-eastern Laurentide Ice Sheet |
topic_facet |
Geology FOS Earth and related environmental sciences Physical Geography 40602 Glaciology |
description |
This thesis presents a palaeoglaciological study aimed to determine the location, geometry and temporal evolution of palaeo-ice streams of the north-easternmost Laurentide Ice Sheet. The work was accomplished through the geomorphological interpretation of satellite imagery over 3.19 x 106 km2 of the Canadian Arctic, using a glaciological inversion scheme. Ice streams were active in this region during most of the time between the Last Glacial Maximum and the last deglaciation. A web of ice streams and inter-ice stream areas existed. Three major ice stream networks are identified: the M'Clintock Channel, Gulf of Boothia – Lancaster Sound and Hudson Strait. The M'Clintock Channel bears the most complex landform record, comprising three generations of palaeo-ice streams. Their location was weakly controlled by the subglacial topography and their geometry was determined by frozen-bed portions of the ice sheet, thus providing evidence for pure ice streams in the Laurentide Ice Sheet. In contrast, the more pronounced relief of the Gulf of Boothia – Lancaster Sound corridor supported topographically controlled ice streams. The landform record on emerged land along Hudson Strait is insufficient to support the existence of ice streams. It is therefore proposed that ice streams were constrained within the deep parts of the strait while flanked by cold-based zones on the margins. Small transient ice streams on Baffin and Prince of Wales islands drained local remnant ice caps during the collapse of the ice sheet. Analysis of the controls on the location and flow of palaeo-ice streams suggests that the interaction between the subglacial topography and thermal state of the substrate plays a more fundamental role than the geology. It is concluded that the behaviour of ice streams cannot be explained in terms of environmental controls alone, but the complex dynamics of ice stream shear margins and onset zones must be considered. Citation:De Angelis, Hernán. 2007. "Palaeo-ice streams in the north-eastern Laurentide Ice Sheet." Doctoral dissertation, Stockholms University. doi: 10.6084/m9.figshare.825392 |
format |
Text |
author |
Angelis, Hernán De |
author_facet |
Angelis, Hernán De |
author_sort |
Angelis, Hernán De |
title |
Palaeo-ice streams in the north-eastern Laurentide Ice Sheet |
title_short |
Palaeo-ice streams in the north-eastern Laurentide Ice Sheet |
title_full |
Palaeo-ice streams in the north-eastern Laurentide Ice Sheet |
title_fullStr |
Palaeo-ice streams in the north-eastern Laurentide Ice Sheet |
title_full_unstemmed |
Palaeo-ice streams in the north-eastern Laurentide Ice Sheet |
title_sort |
palaeo-ice streams in the north-eastern laurentide ice sheet |
publisher |
figshare |
publishDate |
2015 |
url |
https://dx.doi.org/10.6084/m9.figshare.825392.v2 https://figshare.com/articles/journal_contribution/PALAEO_ICE_STREAMS_IN_THE_NORTH_EASTERN_LAURENTIDE_ICE_SHEET/825392/2 |
long_lat |
ENVELOPE(-70.000,-70.000,62.000,62.000) ENVELOPE(-83.999,-83.999,74.218,74.218) ENVELOPE(-62.867,-62.867,-64.900,-64.900) ENVELOPE(-94.214,-94.214,57.802,57.802) ENVELOPE(-90.657,-90.657,70.719,70.719) ENVELOPE(-102.002,-102.002,72.001,72.001) |
geographic |
Arctic Hudson Hudson Strait Lancaster Sound Hernán M'Clintock Gulf of Boothia M'Clintock Channel |
geographic_facet |
Arctic Hudson Hudson Strait Lancaster Sound Hernán M'Clintock Gulf of Boothia M'Clintock Channel |
genre |
Arctic Baffin Hudson Strait Ice Sheet Lancaster Sound |
genre_facet |
Arctic Baffin Hudson Strait Ice Sheet Lancaster Sound |
op_relation |
https://dx.doi.org/10.6084/m9.figshare.825392 |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.825392.v2 https://doi.org/10.6084/m9.figshare.825392 |
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1766347814697172992 |