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TitleA new glacial landscape map of the LIS in central Nunavut, Canada: an integrated approach to understand paleo-ice sheet dynamics
AuthorMcMartin, IORCID logo; Campbell, J; Tremblay, T; Godbout, P -M
Source20th Congress of the International Union for Quaternary Research (INQUA), online programme; 2019 p. 1 Open Access logo Open Access
LinksOnline - En ligne
Alt SeriesNatural Resources Canada, Contribution Series 20180330
PublisherInternational Union for Quaternary Research
MeetingINQUA 2019: 20th Congress of the International Union for Quaternary Research; Dublin; IE; July 25-31, 2019
DocumentWeb site
Mediaon-line; digital
File formathtml; pdf (Adobe® Reader®)
NTS45; 46; 55; 56; 57; 65; 66; 67; 75; 76; 77
Lat/Long WENS-110.0000 -86.0000 70.0000 60.0000
Subjectssurficial geology/geomorphology; geophysics; Nature and Environment; Science and Technology; glacial history; glaciation; deglaciation; glacial deposits; glacial landforms; glacial features; ice sheets; ice flow; ice retreat; ice margins; sediment transport; sediment dispersal; dispersal patterns; modelling; remote sensing; satellite imagery; models; palimpsest sediments; nomenclature; Laurentide Ice Sheet; ArcticDEM; Integration; Databases; ice divides; ice streams; ice-flow directions; subglacial meltwater corridors; Phanerozoic; Cenozoic; Quaternary
ProgramGEM2: Geo-mapping for Energy and Minerals Rae Province, Synthesis of glacial history
Released2019 07 01
AbstractIn the former glaciated areas of central Nunavut in northern Canada, large volumes of ground-based and remote surface geology datasets were acquired by government surveys in key regions that are actively being explored for mineral deposits or assessed for infrastructure expansion under changing climates. These comprehensive georeferenced surface earth materials and geomorphological datasets need to be integrated over broad regions to allow interpretation of glacial landscapes and modelling of past glacial histories and transport patterns. A new digital compilation of glacial features and interpreted glacial landsystems was produced for an area covering ~400,000 km2 in the Keewatin Sector of the Laurentide Ice Sheet (LIS). The new compilation integrates digitally converted published surficial geology maps, recent framework mapping supported by relative and absolute chronologies, and new mapping interpretations using ArcticDEM (5 m resolution) and LANDSAT8 imagery. It permits the identification and grouping of various glacial features into coherent patterns, including ice streams, ice divides, ice retreat positions, flow sets, palimpsest flows, relict and deglacial cold- and warm-based landscapes, and subglacial meltwater corridors. In addition, the compilation reconciles a number of archived field observations and surface sample compositional databases from years of government mapping. Additional field-based observations as well as samples for age dating and composition were collected in targeted areas in 2017 and 2018 to provide constraints on the glacial history, and help evaluate glacial transport in areas of complex ice-flow dynamics and changing basal ice thermal regimes. The final product will consist of a scalable map with accompanying database of glacial features and landforms (individually identified); a field database including ground and remote stations with field observations, ice-flow measurements and/or glacial sediment samples; an interpretation of glacial landscapes (georeferenced overlays); a bibliography of all published sources; and a nomenclature of the map features.
Summary(Plain Language Summary, not published)
This poster 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 poster highlights the nomenclature developed to build the map compilation, the various data sources and interpretations regarding the relative ice-flow chronology and the nature and composition of the glacial sediments. 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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