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TitleThe GEM-2 Glacial Synthesis Project: Overview and report of field activities in the Kivalliq region, Nunavut
AuthorMcMartin, I; Tremblay, T; Godbout, P M; Campbell, J E; Kerr, D E
SourceNorthwest Territories Geological Survey, Yellowknife Geoscience Forum Abstract and Summary Volume (2017), 2017 p. 50-51 (Open Access)
LinksOnline - En ligne
Alt SeriesNatural Resources Canada, Contribution Series 20170268
PublisherNorthwest Territories Geological Survey
MeetingYellowknife Geoscience Forum; Yellowknife; CA; November 14-16, 2017
Mediapaper; on-line; digital
File formatpdf
ProvinceNunavut; Northwest Territories
AreaKeewatin Sector; Baker Lake; Arviat
Subjectssurficial geology/geomorphology; economic geology; glacial history; glacial features; glacial landforms; dispersal patterns; glacial erosion; tills; lithogeochemistry; mineral exploration; ice sheets; ice movement directions; ice transport directions; Laurentian Ice-sheet
ProgramRae Province, Synthesis of glacial history, GEM2: Geo-mapping for Energy and Minerals
AbstractA new project was initiated as part of the GEM-2 Program in mainland Nunavut and Northwest Territories to compile and document the characteristics and history of glacial landscapes in a poorly mapped core region of the Keewatin Sector of the Laurentide Ice Sheet (LIS). The updated regional compilation of glacial features and reconstruction of the glacial history will provide a much needed framework for an improved understanding of glacial dispersal patterns at all scales. Targeted fieldwork was completed in 2017 in the Baker Lake and Arviat areas to answer questions related to the nature of the landscape and materials under the Keewatin Ice Divide (KID), chronology of glacial and deglacial events, and glacial dispersal characteristics along ice stream flows. The post-glacial marine limit of submergence was examined, measured and sampled for terrestrial cosmogenic nuclide (TCN) exposure dating and infrared stimulated luminescence (IRSL) dating. Significant variations in the elevation of the marine limit across the area are associated with late ice front positions in contact with the Tyrrell Sea close to the last remnants of the KID. The divide area itself varies in nature, degree of weathering and surface materials composition. The terrain west of Arviat and near Baker Lake is indicative of a warm-based, erosive regime, and grades into an intermediate cold-based, protective (non-erosive) terrain NE of Baker Lake towards the uplands south of Wager Bay. The determination of relative erosion rates in till and bedrock under the KID with TCN will help to evaluate how glacial sediments can be used for mineral exploration in areas potentially complicated by inherited compositional signatures. Surface till composition examined in three ice stream terrains suggests long-distance transport of distinctive lithologies. Geochemical and lithological analyses of the surface till samples, coupled with lithogeochemical analysis of distinct Dubawnt SuperGroup lithologies, will be integrated with previous regional sampling results and the glacial history to permit a better evaluation of glacial transport characteristics in areas of shifting ice flows, ice streams and across relict landscapes preserved under non-erosive regimes.
Summary(Plain Language Summary, not published)
This talk presents an overview of the 2017 fieldwork completed in the Baker Lake and Arviat areas, mainland Nunavut, as part of the GEM-2 Rae Synthesis of Glacial History and Dynamics Activity. The talk highlights preliminary results regarding the relative ice-flow chronology and the nature and composition of the glacial sediments under a major paleo-ice divide and in ice stream terrains. 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 the Kivalliq Region. The findings will support informed decision making for resource exploration and land use management.