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TitleNew glacial landscape map database for the interior of the Laurentide Ice Sheet, central Nunavut and Northwest Territories
AuthorMcMartin, I; Campbell, J E; Kerr, D; Tremblay, T; Normandeau, P X
SourceCANQUA-AMQUA Ottawa 2018, joint meeting joint meeting of the Canadian and American Quaternary Associations, crossing borders in the Quaternary, program; 2018 p. 133
LinksOnline - En ligne (complete volume - volume complet, pdf, 11.5 MB)
Alt SeriesNatural Resources Canada, Contribution Series 20180088
MeetingCanadian Quaternary Association and American Quaternary Association CANQUA-AMQUA joint meeting; Ottawa; CA; August 7-11, 2018
Mediapaper; on-line; digital
File formatpdf
ProvinceNunavut; Northwest Territories
NTS45; 46; 47; 55; 56; 57; 65; 66; 67; 75; 76; 77; 85; 86; 87; 95; 96; 97; 106; 107
Lat/Long WENS-140.0000 -80.0000 70.0000 60.0000
Subjectssurficial geology/geomorphology; geophysics; geochemistry; mineralogy; glacial history; glaciation; ice sheets; deglaciation; models; remote sensing; satellite imagery; glacial deposits; glacial landforms; glacial features; sediment dispersal; dispersal patterns; pebble lithology; sediment geochemistry; Laurentide Ice Sheet; Keewatin Sector; ArcticDEM; databases; geological mapping; digital elevation models; Landsat8; geographic information systems; Phanerozoic; Cenozoic; Quaternary
ProgramGEM2: Geo-mapping for Energy and Minerals, Rae Province, Synthesis of glacial history
Released2018 08 01
AbstractA new digital map database of glacial landscapes is being compiled in the core region of the Keewatin Sector of the Laurentide Ice Sheet (LIS) to characterize and group glacial sediments and landforms into coherent patterns and provide an update of the glacial history of central Nunavut and eastern Northwest Territories. Surficial geological mapping in the region shows evidence for multiple glaciations and dynamic glacial systems. However, Keewatin is still considered one of the last frontiers of the LIS where insufficient synthesized glacial maps and chronological constraint restrict paleoglaciological reconstructions and models. Recent compilations of glacial features are largely based on remote sensing interpretations showing various levels of generalization with little integration of field-based information. Our new compilation is derived from digitally converted published surficial geology maps, recent field datasets and new mapping interpretations using ArcticDEM and Landsat8 imagery, supported by relative and absolute chronologies. This compilation consists of a GIS map (scalable) and database of glacial features (individually identified from source maps), and a descriptive legend including line and point features and various overlay features representing interpreted landscapes (e.g., ice stream, flowset, ice divide, palimpsest, relict, cold-based). The features are grouped into simplified shape files with information stored in attribute tables for each feature/field observation type regarding timing, mapper and nature of interpretation (e.g., error, duplication, shift, addition), and original data source. Additional field-based information on the nature of the landscape and surficial materials as well as samples for dating and composition were collected in key areas in 2017 and 2018 to fill knowledge gaps. Glacial dispersal and updated glacial histories will be tested using till clast lithology and matrix geochemistry along selected transects crossing the various glacial terrains identified. A preliminary map for the eastern sector of the project compilation covering ~400,000 km2 in Nunavut is presented.
Summary(Plain Language Summary, not published)
This poster presents a preliminary map database of newly interpreted glacial landscapes for the eastern sector of a project compilation covering ~400,000 km2 in mainland Nunavut, compiled as part of the GEM-2 Rae Synthesis of Glacial History and Dynamics Activity. The poster also summarizes methods, various source maps, and new interpretations supported by high-resolution digital elevation models, satellite imagery, new chronological constraints and field datasets. The work was undertaken to provide new geological knowledge on the glacial history of the north-central portion of the Laurentide Ice Sheet and to help understand glacial transport characteristics across major glacial landscapes in the Kivalliq Region. The findings will support informed decision making for resource exploration and land use management.