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TitleHigh-resolution mapping of glacial landscapes in central mainland Nunavut using ArcticDEM data and Landsat 8 imagery
 
AuthorMcMartin, IORCID logo; Godbout, P -M; Campbell, J E; Tremblay, T; Behnia, P
SourceGSA 2020 Connects Online - Geological Society of America Annual Meeting; Geological Society of America, Abstracts With Programs vol. 52, no. 6, 129-3, 2020 p. 1, https://doi.org/10.1130/abs/2020AM-354703 Open Access logo Open Access
Image
Year2020
Alt SeriesNatural Resources Canada, Contribution Series 20200344
PublisherGeological Society of America
MeetingGSA 2020: Geological Society of America Annual Meeting 2020; October 26-30, 2020
Documentserial
Lang.English
Mediapaper; on-line; digital
File formathtml; pdf
ProvinceNunavut
NTS46D; 46E; 46F; 46K; 46L; 46M; 46N; 55; 56; 65A; 65B; 65G; 65H; 65I; 65J; 65O; 65P; 66A; 66B; 66G; 66H; 66I; 66J; 66O; 66P
AreaHudson Bay; Wager Bay; Baker Lake; Rankin Inlet; Arviat; Naujaat
Lat/Long WENS-100.0000 -85.0000 68.0000 60.0000
Subjectssurficial geology/geomorphology; environmental geology; economic geology; Nature and Environment; Science and Technology; glacial history; glaciation; ice sheets; deglaciation; glacial features; glacial landforms; ice flow; paleoenvironment; sediment transport; sediment dispersal; mineral exploration; drift prospecting; climate; Laurentide Ice Sheet; ArcticDEM; Landsat 8; Geological maps; ice-flow directions; ice streams; ice divides; Geographic data; Geographic information systems; Climate change; Phanerozoic; Cenozoic; Quaternary
ProgramGEM2: Geo-mapping for Energy and Minerals Rae Province, Synthesis of glacial history
Released2020 10 01
AbstractA new glacial geomorphology map was produced for an area covering ~415,000 km2 in a core region of the Laurentide Ice Sheet (LIS) in Nunavut. The map builds on recent and legacy surficial geology maps and is significantly improved by digitization of glacigenic features using a combination of high-resolution ArcticDEM data (2-m resampled to 5-m resolution) and Landsat 8 images (30-m pansharpen to 15-m). Data comprised of glacial geomorphological features were individually identified (lines and points) or grouped in generalized areas (polygons). Information (metadata) was stored in attribute tables for each mapped feature, including feature type, subtype (if distinguished), and original map data source and/or nature of modification or addition.
From this unprecedented, detailed inventory of ~152,000 features and >14,000 field observations, we identify and map coherent patterns of landform development (landsystems) between the Manitoba border and the Arctic coast, many of which are entirely new and others that are significantly modified or updated. In particular, we recognize six separate ice streams and delineate numerous palimpsest streamlined landscapes with associated ice flow trends and relative ages. A continuum of relict terrains with varying basal ice thermal conditions is mapped for the first time in the ice divide migration zone between Baker Lake and Wager Bay. In addition, deglacial cold-based retreat terrains and preserved warm-based landscapes unaffected by younger glacial events have been identified.
The final products consist of: generalized glacial geomorphology maps at 1:5 million and 1:1 million scales; an interpretation of entirely new or updated glacial landsystems; and a bibliography of all published sources of information. The GIS data files comprise glacial features mapped at original scales, standardized field datasets and glacial landsystems overlays. These new georeferenced, multi-scale datasets provide a comprehensive framework to strengthen reconstructions of the glacial history and dynamics of one of the largest ice dome of the LIS, help identify distinct glacial sediment transport paths for applications to mineral exploration, and test numerical modelling of the LIS in support of climate change studies and long-term evolution of modern ice sheets.
Summary(Plain Language Summary, not published)
This poster presents a new glacial geomorphology map synthesizing a comprehensive database of former glacial landscapes in a large area of mainland Nunavut as part of the GEM-2 Rae Synthesis of Glacial History and Dynamics Activity. The poster highlights the various data sources, the mapping methods using high-resolution imageries and the interpretations of glacial landsystems. The work was undertaken to provide new geological knowledge on the glacial history of the Keewatin region and to help understand glacial transport across major glacial landscapes in northern regions. The findings will support informed decision making for resource exploration and land use management.
GEOSCAN ID327032

 
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