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TitleSurficial geology, Lefroy Bay (southwest), Nunavut
AuthorCampbell, J E; McMartin, I
SourceGeological Survey of Canada, Canadian Geoscience Map 152, 2014, 1 sheet,
PublisherNatural Resources Canada
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; jpg; JPEG2000; xls
NTS46M/03; 46M/04; 46M/05; 46M/06; 46M/12
AreaMiles Lake; Lefroy Bay; Salt Lake; Saputit Lake; Committee Bay
Lat/Long WENS-88.0000 -87.3167 67.6333 67.0000
Subjectssurficial geology/geomorphology; glacial features; glacial deposits; glacial landforms; tills; sands; gravels; glaciofluvial deposits; glaciomarine deposits; organic deposits; alluvial deposits; eolian deposits; colluvial deposits; marine deposits; ice flow; flow trajectories; moraines; Cenozoic; Quaternary
Illustrationslocation maps
ProgramMultiple Metals - Melville Peninsula (Nunavut), GEM: Geo-mapping for Energy and Minerals
Released2014 06 19
AbstractDiverse Quaternary sediments and depositional environments with notable landforms characterise the map area. Till blankets and till veneers are scattered through the area but are dominant above the marine limit. Sand and gravel deposits above the marine limit mainly occur in pro-glacial outwash trains, glaciofluvial aprons/deltas and icecontact landforms (eskers, kames) concentrated in valleys. The marine sequence includes, from the limit of marine incursion to the present-day coastline, thick deposits of deltaic sands and gravels, extensive areas of exposed and gullied clayey silts, marine offlap sands and silts, and sand and gravel littoral sediments. Sand veneers and patches of wave-washed tills are present below the marine limit. Extensive areas of exposed bedrock occur south of Committee Bay. Multiple ice-flow directions indicate a north to northwest flow that predates the dominant northeast then northward flows. Major end moraines (part of the Chantrey Moraine System) are present in the map area with divergent ice-flow directions on either side (northeast versus north). Marine limit elevation drops significantly from ~ 240 m a.s.l. north of the moraine (Giangioppi, M. et al. 2003) to ~170 m a.s.l. in the south map area suggesting a major stillstand at the Chantrey Moraines during deglaciation.
Summary(Plain Language Summary, not published)
The Lefroy Bay (southwest) map (NTS 46-M SW) identifies surficial materials and associated landforms formed by the last glacier ice that covered the area until about 6000 years ago. The surficial geology is based on aerial photograph interpretation and fieldwork. This work was undertaken to provide new geological knowledge and improve our understanding of the distribution, nature and glacial history of surficial materials. This contributes to effective mineral exploration and supports informed decision making for resource development and land use.