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Glacial History and Landform Genesis in the Lac de Gras Area, Northwest Territories
| Description: | The Quaternary geology of the Lac de Gras area was studied by 1:20 000 surficial geology mapping of 770 km2 and investigating the genesis of enigmatic landforms. Three distinct flow directions of the Laurentide Ice Sheet are recorded: flow to the southwest, then west, and finally to the west northwest. Digital mapping with high-resolution orthoimagery and a 30 cm lidar DEM provides insight into the deglacial history. ‘Subglacial meltwater corridors’ are prominent in the area. These are tracts that roughly parallel the final ice-flow direction, where basal till has been eroded, bedrock is exposed, and glaciofluvial sediments have been deposited; enigmatic, glaciofluvial mounds composed of sandy diamicton are common. These mounds have highly variable morphologies and occur in groups. They are typically 50 m wide and rise up to 15 m above the surrounding topography. Subglacial meltwater corridors and enigmatic mounds likely formed when supraglacial lakes drained catastrophically during deglaciation. This dataset was originally deposited in the Simon Fraser University institutional repository. |
| Notes: | Rights remain with the creator; contact for details. |
| Authors: | Haiblen, Anna Macdonald; Simon Fraser University;  0000-0002-9773-8030 |
| Keywords: | Quaternary Geology Laurentide Ice Sheet Surficial mapping Glacial landform genesis Subglacial meltwater flow Lac de Gras |
| Field of Research: | Earth and related environmental sciences > Cryosphere processes > Glaciology
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| Publication Date: | 2023-03-13 |
| Publisher: | Federated Research Data Repository / dépôt fédéré de données de recherche |
| URI: | https://doi.org/10.25314/bd59a8ee-6c74-4dc9-b541-3b9e08dc4490 |
| Related Identifiers: |
This dataset is cited by
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| Geographic Coverage: | Place Name Lac de Gras Province / Province / Territory Northwest Territories Territory Country Canada |
| Appears in Collections: | SFU Research Data |
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Access to this dataset is subject to the following terms:
Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/
Citation
Haiblen, A. (2023). Glacial History and Landform Genesis in the Lac de Gras Area, Northwest Territories. Federated Research Data Repository. https://doi.org/10.25314/bd59a8ee-6c74-4dc9-b541-3b9e08dc4490
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