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TitleA new map of glacigenic features and glacial landsystems in central mainland Nunavut, Canada
AuthorMcMartin, I; Godbout, P -M; Campbell, J E; Tremblay, T; Behnia, P
SourceBoreas 2020 p. 1-25, (Open Access)
Alt SeriesNatural Resources Canada, Contribution Series 20200289
PublisherTaylor and Francis Online
Mediapaper; on-line; digital
RelatedThis publication is related to the following publications
File formatpdf; html
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; geophysics; economic geology; environmental geology; Nature and Environment; Science and Technology; glacial history; glaciation; ice sheets; ice flow; deglaciation; ice retreat; glacial landforms; glacial features; eskers; moraines; crag and tail; lineations; troughs; meltwater channels; deltas; tills; remote sensing; satellite imagery; relative ages; paleoenvironment; sediment transport; sediment dispersal; mineral exploration; drift prospecting; modelling; climate; glaciers; Laurentide Ice Sheet; Keewatin Sector; ArcticDEM; Landsat 8; Keewatin Ice Divide; Dubawnt Supergroup; glacial land systems; geological mapping; digital elevation models; ice streams; ice-flow directions; ice divides; geographic data; ice domes; climate change; archival data; databases; datasets; subglacial meltwater corridors; limit of submergence, marine; ice-contact deltas; geological maps; Phanerozoic; Cenozoic; Quaternary
Illustrationslocation maps; digital elevation models; geoscientific sketch maps; photographs; satellite images
ProgramGEM2: Geo-mapping for Energy and Minerals, Rae Province, Synthesis of glacial history
Released2020 11 06
AbstractA new digital map of glacial geomorphic features and interpreted glacial landsystems was produced for an area covering ~415 000 km2 in the Keewatin Sector of the Laurentide Ice Sheet (LIS) in Nunavut. The map integrates information from previous surficial geology maps and >14 000 field stations, and is significantly improved by the detailed inventory of ~152 000 glacigenic features using high-resolution ArcticDEM data and Landsat 8 imagery. From this, 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, including one probable remnant ice stream, and we 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. These new georeferenced, multi-scale data sets and interpreted glacial landsystems provide a comprehensive framework to strengthen reconstructions of the glacial history and dynamics of one of the largest ice domes of the LIS, 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 paper presents a glacial geomorphology map compilation 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 paper highlights the nomenclature and methods developed to build the map compilation, the various data sources and interpretations regarding the glacial landsystems identified. 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.