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TitleSurficial geology, Curtis Lake south, Nunavut, NTS 56-I south
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AuthorMcMartin, I; Campbell, J E; Dredge, L A
SourceGeological Survey of Canada, Canadian Geoscience Map 294, 2017, 1 sheet, https://doi.org/10.4095/299346
Year2017
PublisherNatural Resources Canada
Editionprelim.
Documentserial
Lang.English
Maps1 map
Map Info.surficial geology, glacial deposits and landforms, 1:100,000
ProjectionUniversal Transverse Mercator Projection, zone 16 (NAD83)
Mediaon-line; digital
File formatreadme
File formatpdf; rtf; shp; xml; tif; gdb; mxd
ProvinceNunavut
NTS56I/01; 56I/02; 56I/03; 56I/04; 56I/05; 56I/06; 56I/07; 56I/08
AreaCurtis Lake
Lat/Long WENS -90.0000 -88.0000 66.5000 66.0000
Subjectssurficial geology/geomorphology; glacial features; glacial deposits; glacial landforms; tills; sands; gravels; moraines; glaciofluvial deposits; glaciolacustrine deposits; alluvial deposits; organic deposits; eolian deposits; lacustrine deposits; marine deposits; ice flow; flow trajectories; thermokarst; ice-wedge polygons; kettles; paleogeography; shoreline changes; submergence; meltwater channels; eskers; scarps; drumlinoids; drumlins; crag and tail; flutings; hummocks; fans; deltas; ice contact deposits; glacial striations; Phanerozoic; Cenozoic; Quaternary
Illustrationslocation maps; index maps; sketch maps
ProgramRae Province, Tehery-Wager Bay, GEM2: Geo-mapping for Energy and Minerals
ProgramPolar Continental Shelf Program
ProgramMultiple Metals - Melville Peninsula (Nunavut), GEM: Geo-mapping for Energy and Minerals
Image
Released2017 01 25
AbstractThe Curtis Lake south map area is extensively covered by streamlined till, interspersed by bedrock uplands, and by linear glacial troughs in the southwest. Large crag-and-tail landforms apparent on the DEM converge north-northeastward, associated with a major ice stream during the last glaciation (Fig. 1). Major changes in ice-flow directions (Fig. 1) and complex retreat patterns characterized deglaciation. Retreat of ice margins associated with cold-based ice started southward and cold-based, as recorded by abundant lateral ice-marginal meltwater channels found mainly in the north part of the map area. Late during deglaciation, two major ice-flow shifts occurred as a result of drawdown into marine embayments: an eastward flow towards Repulse Bay in the east, and a flow reversal towards Wager Bay in the southwest. Late striations, superimposed streamlined landforms, eskers, subglacial meltwater corridors and channels attest to a warm-based deglaciation in these areas. In the central uplands, retreat to remnant ice masses centred over many of the large lake basins continued largely cold-based, preserving the northward streamlined glacial landscape. The postglacial sea inundated the lowest valleys in the southwest up to 120 m a.s.l.
Summary(Plain Language Summary, not published)
The Curtis Lake South map area (NTS 56I-S) identifies surficial materials and associated landforms left by the retreat of the last glaciers which covered the area until about 6000 years ago. The surficial geology is based on aerial photography interpretation, satellite imageries and field work. This work was undertaken to provide new geological knowledge and improve our understanding of the distribution, nature and glacial history of surficial materials. This work will support informed decision making for resource development and land use.
GEOSCAN ID299346