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TitleHigh-resolution mapping of glacial landscapes in the north-central portion of the Laurentide Ice Sheet in Nunavut and Northwest Territories
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorMcMartin, IORCID logo; Campbell, J E; Godbout, P-M; Behnia, P; Tremblay, TORCID logo; Normandeau, P XORCID logo
SourceGeological Survey of Canada, Preprint 4, 2022, 27 pages, Open Access logo Open Access
PublisherNatural Resources Canada
Mediadigital; on-line
RelatedNRCan photo(s) in this publication
File formatpdf
ProvinceNunavut; Northwest Territories
NTS55; 56; 65; 66
AreaWager Bay; Baker Lake; Arviat; Rankin Inlet
Lat/Long WENS-100.0000 -85.0000 68.0000 60.0000
Subjectssurficial geology/geomorphology; glacial deposits; glacial features; glacial landforms; lineations; eskers; moraines; ice movement directions; tills; channels; meltwater channels; Laurentide Ice Sheet; Northwest Keewatin; South Rae; Quaternary
Illustrationstables; location maps; photographs; images
ProgramGEM2: Geo-mapping for Energy and Minerals
Released2022 10 13; 2022 11 02
AbstractA new glacial geomorphology map covers approximately 415,000 km2 in a core region of the Laurentide Ice Sheet in Nunavut. The compilation builds on recent and legacy maps and is supplemented by visual digitization of glacigenic features using high-resolution digital elevation (ArcticDEM) and Landsat 8 images. From this unprecedented, detailed inventory of >156,000 features and >14,000 field observations, we identify various glacial landsystems, many of which are entirely new and others that are significantly modified or updated. These include ice streams, palimpsest ice flows, and areas where basal ice thermal regimes fluctuated between cold-based and warm-based. The GIS data comprise glacial features mapped at original and generalized scales, standardized field datasets and interpreted glacial landsystems. These comprehensive georeferenced datasets can be used to reconstruct the glacial history in the interior portion of the Laurentide Ice Sheet in Nunavut and Northwest Territories and to identify distinct glacial sediment transport paths for applications to mineral exploration.
Summary(Plain Language Summary, not published)
A new digital compilation of glacial features and interpreted glacial landsystems was produced for a large area covering ~425,000 km2 in the Keewatin Sector of the Laurentide Ice Sheet in central mainland Nunavut. The compilation builds on previous surficial geology maps but is significantly improved by the mapping of glacigenic features using recently available high-resolution digital elevation model (ArcticDEM) and Landsat 8 imagery. The chapter provides an historical review of previous glacial geomorphology mapping in the GEM2 Rae Glacial Synthesis project area, and summarizes the mapping methods and outputs for Sector 1 published in the Journal of Maps (JoM) open-access release. The work was undertaken to provide new geological knowledge on the history of ice flow events and help understand glacial transport characteristics across major glacial landscapes in northern regions. The findings will support informed decision making for resource exploration and land use management

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