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TitlePreliminary ice-flow reconstruction and deglacial patterns in the west-central Keewatin Sector of the Laurentide Ice Sheet (Northwest Territories and Nunavut, Canada)
AuthorBrouard, EORCID logo; Campbell, J E; McMartin, IORCID logo; Godbout, P M
SourceXXI INQUA Congress - Program with Abstracts; 2023 p. 1
Alt SeriesNatural Resources Canada, Contribution Series 20220384
MeetingINQUA 2023; Rome; IT; July 14-20, 2023
Mediapaper; digital; on-line
File formatpdf
ProvinceNorthwest Territories; Nunavut
NTS65; 75; 66; 76
Lat/Long WENS-112.0000 -96.0000 68.0000 60.0000
Subjectsgeochronology; ice; ice conditions; ice flow; deglaciation; Laurentide Ice Sheet
Illustrationslocation maps
ProgramGEM-GeoNorth: Geo-mapping for Energy and Minerals GEM Program Coordination
Released2023 07 19
AbstractReconstructions of the evolution of the Laurentide Ice Sheet (LIS) since the last glacial maximum (MIS2; <29 ka) provides a framework for understanding changes in ice extent and dynamics that are essential to a wide range of studies such as paleogeographic reconstructions, glaciological and glacial isostatic adjustment modeling, sea-level changes, ice-dammed lakes reconstructions and mineral exploration. The LIS was comprised of three major domes located in northern remote regions of Canada that until recently, have not been the focus of extensive field studies on glacial history and therefore, knowledge gaps remain. The Keewatin Dome formed one of the major domes of the LIS and was located in Northwest Territories and mainland Nunavut (Canada) where recent work suggests complex glacial history resulting from ice devide migration, ice streaming, and old landscape preservation over multiple glacial events. Yet, these landsystems remain mostly unmapped and undated, and therefore uncorrelated at the regional scale. To address this lack of regional knowledge on glacial history and building on the new compilation of glacigenic features and landsystems in eastern Keewatin (McMartin et al., 2021), an activity has been initiated as part of Canada's Geo-Mapping for Energy and Minerals (GEM) GeoNorth program (2021-2026) to provide a glacial geology framework for the west-central Keewatin region supported by targeted field investigations and high-resolution digital mapping (ArcticDEM).
Summary(Plain Language Summary, not published)
The northern center of Canada (eastern Northwest Territories and central mainland Nunavut) was, during the last glaciation, covered by a huge ice sheet called the Keewatin Dome. However, this region remains today one of the least known region in terms of glacial history and dynamics. The limited work carried out in the region seem to point to a complex glacial system comprising several events associated with strongly diverging flow directions. Unfortunately, these events remain poorly understood, in part due to an undeveloped geological framework, which therefore hampers our understanding of the physical environment of the region, which is vital for land-based ventures and decision-making (for example, infrastructure, mineral exploration, permafrost, ice sheet modeling, past changes in sea level and climate). We therefore set out to build a geological framework, based on existing field data collected on surficial geology for the region and high-resolution digital mapping. The compilation and mapping of data allowed us to collect information on 2,475 sites and over 100,000 features which allow us to obtain a first vision of the glacial history of the region. This work will be accompanied by targeted fieldwork and analysis and interpretation of Quaternary history in the west-central Keewatin region as part of the GEM GeoNorth program.

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