Morphological signatures of deglaciation and postglacial sedimentary processes in a deep fjord‐lake (Grand Lake, south‐EASTERN labrador).
High‐resolution multibeam bathymetric data and acoustic sub‐bottom profiles were recently collected in Grand Lake (Labrador), one of the deepest lake basins in eastern North America, to reconstruct: (1) the retreat of the Laurentide Ice Sheet (LIS) west of Lake Melville, and (2) the history of sedim...
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Language: | English |
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2020
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Online Access: | https://espace.inrs.ca/id/eprint/9706/ https://espace.inrs.ca/id/eprint/9706/1/P3631.pdf https://doi.org/10.1002/esp.4786 |
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ftinrsquebec:oai:espace.inrs.ca:9706 2023-05-15T15:35:28+02:00 Morphological signatures of deglaciation and postglacial sedimentary processes in a deep fjord‐lake (Grand Lake, south‐EASTERN labrador). Trottier, Annie-Pier Lajeunesse, Patrick Gagnon-Poiré, Antoine Francus, Pierre 2020 application/pdf https://espace.inrs.ca/id/eprint/9706/ https://espace.inrs.ca/id/eprint/9706/1/P3631.pdf https://doi.org/10.1002/esp.4786 en eng https://espace.inrs.ca/id/eprint/9706/1/P3631.pdf Trottier, Annie-Pier, Lajeunesse, Patrick, Gagnon-Poiré, Antoine et Francus, Pierre orcid:0000-0001-5465-1966 (2020). Morphological signatures of deglaciation and postglacial sedimentary processes in a deep fjord‐lake (Grand Lake, south‐EASTERN labrador). Earth Surface Processes and Landforms , vol. 45 , nº 4. p. 928-947. DOI:10.1002/esp.4786 <https://doi.org/10.1002/esp.4786>. doi:10.1002/esp.4786 geomorphology deglacial landforms fjord‐lake ice‐stream bathymetry Article Évalué par les pairs 2020 ftinrsquebec https://doi.org/10.1002/esp.4786 2023-02-10T11:45:47Z High‐resolution multibeam bathymetric data and acoustic sub‐bottom profiles were recently collected in Grand Lake (Labrador), one of the deepest lake basins in eastern North America, to reconstruct: (1) the retreat of the Laurentide Ice Sheet (LIS) west of Lake Melville, and (2) the history of sedimentation since deglaciation in this 54‐km long, 3‐km wide fjord‐lake. Our results provide a morphostratigraphical framework that brings new insights to the style and pattern of retreat of the LIS in the region as well as deglacial and postglacial sedimentary dynamics. Terrestrial glacial lineations observed on a digital elevation model (DEM) provide evidence of a previously undocumented ice stream in the Grand Lake area. This newly mapped ice stream suggests that the calving bay formed in Lake Melville triggered a reorganisation of the regional drainage pattern of the LIS. The sedimentary infill of Grand Lake consists of a sequence of deglacial to postglacial sediments that contain deposits related to a series of mass movements. The 8.2 cal ka BP cold event is recorded in Grand Lake by a series of closely spaced moraines deposited at the outlet of the fjord‐lake to form a morainic complex similar to the Cockburn morainic complex on Baffin Island. During deglaciation, a dense dendritic network of proglacial gullies incised into the steep sidewalls of the lake. Since deglaciation, paraglacial and postglacial sedimentation has led to the deposition of large prograding deltas at the fjord head, where density currents remain active today and have formed a series of sediment waves on the frontal slopes and a prodeltaic environment. Article in Journal/Newspaper Baffin Island Baffin Ice Sheet Institut national de la recherche scientifique, Québec: Espace INRS Baffin Island Cockburn ENVELOPE(-62.295,-62.295,-64.018,-64.018) Lake Melville ENVELOPE(-59.557,-59.557,53.728,53.728) Earth Surface Processes and Landforms 45 4 928 947 |
institution |
Open Polar |
collection |
Institut national de la recherche scientifique, Québec: Espace INRS |
op_collection_id |
ftinrsquebec |
language |
English |
topic |
geomorphology deglacial landforms fjord‐lake ice‐stream bathymetry |
spellingShingle |
geomorphology deglacial landforms fjord‐lake ice‐stream bathymetry Trottier, Annie-Pier Lajeunesse, Patrick Gagnon-Poiré, Antoine Francus, Pierre Morphological signatures of deglaciation and postglacial sedimentary processes in a deep fjord‐lake (Grand Lake, south‐EASTERN labrador). |
topic_facet |
geomorphology deglacial landforms fjord‐lake ice‐stream bathymetry |
description |
High‐resolution multibeam bathymetric data and acoustic sub‐bottom profiles were recently collected in Grand Lake (Labrador), one of the deepest lake basins in eastern North America, to reconstruct: (1) the retreat of the Laurentide Ice Sheet (LIS) west of Lake Melville, and (2) the history of sedimentation since deglaciation in this 54‐km long, 3‐km wide fjord‐lake. Our results provide a morphostratigraphical framework that brings new insights to the style and pattern of retreat of the LIS in the region as well as deglacial and postglacial sedimentary dynamics. Terrestrial glacial lineations observed on a digital elevation model (DEM) provide evidence of a previously undocumented ice stream in the Grand Lake area. This newly mapped ice stream suggests that the calving bay formed in Lake Melville triggered a reorganisation of the regional drainage pattern of the LIS. The sedimentary infill of Grand Lake consists of a sequence of deglacial to postglacial sediments that contain deposits related to a series of mass movements. The 8.2 cal ka BP cold event is recorded in Grand Lake by a series of closely spaced moraines deposited at the outlet of the fjord‐lake to form a morainic complex similar to the Cockburn morainic complex on Baffin Island. During deglaciation, a dense dendritic network of proglacial gullies incised into the steep sidewalls of the lake. Since deglaciation, paraglacial and postglacial sedimentation has led to the deposition of large prograding deltas at the fjord head, where density currents remain active today and have formed a series of sediment waves on the frontal slopes and a prodeltaic environment. |
format |
Article in Journal/Newspaper |
author |
Trottier, Annie-Pier Lajeunesse, Patrick Gagnon-Poiré, Antoine Francus, Pierre |
author_facet |
Trottier, Annie-Pier Lajeunesse, Patrick Gagnon-Poiré, Antoine Francus, Pierre |
author_sort |
Trottier, Annie-Pier |
title |
Morphological signatures of deglaciation and postglacial sedimentary processes in a deep fjord‐lake (Grand Lake, south‐EASTERN labrador). |
title_short |
Morphological signatures of deglaciation and postglacial sedimentary processes in a deep fjord‐lake (Grand Lake, south‐EASTERN labrador). |
title_full |
Morphological signatures of deglaciation and postglacial sedimentary processes in a deep fjord‐lake (Grand Lake, south‐EASTERN labrador). |
title_fullStr |
Morphological signatures of deglaciation and postglacial sedimentary processes in a deep fjord‐lake (Grand Lake, south‐EASTERN labrador). |
title_full_unstemmed |
Morphological signatures of deglaciation and postglacial sedimentary processes in a deep fjord‐lake (Grand Lake, south‐EASTERN labrador). |
title_sort |
morphological signatures of deglaciation and postglacial sedimentary processes in a deep fjord‐lake (grand lake, south‐eastern labrador). |
publishDate |
2020 |
url |
https://espace.inrs.ca/id/eprint/9706/ https://espace.inrs.ca/id/eprint/9706/1/P3631.pdf https://doi.org/10.1002/esp.4786 |
long_lat |
ENVELOPE(-62.295,-62.295,-64.018,-64.018) ENVELOPE(-59.557,-59.557,53.728,53.728) |
geographic |
Baffin Island Cockburn Lake Melville |
geographic_facet |
Baffin Island Cockburn Lake Melville |
genre |
Baffin Island Baffin Ice Sheet |
genre_facet |
Baffin Island Baffin Ice Sheet |
op_relation |
https://espace.inrs.ca/id/eprint/9706/1/P3631.pdf Trottier, Annie-Pier, Lajeunesse, Patrick, Gagnon-Poiré, Antoine et Francus, Pierre orcid:0000-0001-5465-1966 (2020). Morphological signatures of deglaciation and postglacial sedimentary processes in a deep fjord‐lake (Grand Lake, south‐EASTERN labrador). Earth Surface Processes and Landforms , vol. 45 , nº 4. p. 928-947. DOI:10.1002/esp.4786 <https://doi.org/10.1002/esp.4786>. doi:10.1002/esp.4786 |
op_doi |
https://doi.org/10.1002/esp.4786 |
container_title |
Earth Surface Processes and Landforms |
container_volume |
45 |
container_issue |
4 |
container_start_page |
928 |
op_container_end_page |
947 |
_version_ |
1766365800016379904 |