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TitleReconnaissance surficial geology, MacAlpine Lake, south half, Nunavut, NTS 66-L
DownloadDownloads
AuthorSt-Onge, D A; Kerr, D E
SourceGeological Survey of Canada, Canadian Geoscience Map 142, 2014, 1 sheet, https://doi.org/10.4095/293616
Year2014
PublisherNatural Resources Canada
Editionprelim.
Documentserial
Lang.English
Maps1 map
Map Info.surficial geology, glacial deposits and landforms, 1:125,000
ProjectionUniversal Transverse Mercator Projection, zone 13 (NAD83)
Mediaon-line; digital
File formatreadme
File formatpdf; rtf; shp; xml; xls; jpg; JPEG2000
ProvinceNunavut
NTS66L/01; 66L/02; 66L/03; 66L/04; 66L/05; 66L/06; 66L/07; 66L/08
AreaMacAlpine Lake
Lat/Long WENS-104.0000 -102.0000 66.5000 66.0000
Subjectssurficial geology/geomorphology; glacial features; glacial deposits; glacial landforms; tills; sands; gravels; glaciolacustrine deposits; glaciofluvial deposits; organic deposits; alluvial deposits; colluvial deposits; eolian deposits; lacustrine deposits; moraines; Cenozoic; Quaternary
ProgramGeomapping for Energy & Minerals (GEM) - Geo-mapping Frontiers, GEM: Geo-mapping for Energy and Minerals
Image
Released2014 05 12 (13:00)
AbstractPreliminary surficial geology studies, through aerial photograph interpretation and limited legacy data, were undertaken in the south half of the MacAlpine Lake map area to provide an improved understanding of distribution and nature of surficial sediments, and regional glacial history. Widespread streamlined till, hummocky till with kettle lakes and till veneer which may exhibit small transverse ridges locally, are common across the map area. Some tills are dissected by north-northwestward trending glaciofluvial corridors consisting of eskers, ice-contact sediments, and locally zones of scoured bedrock and lags of till veneer. Isolated glacial lakes of variable extent were formed by ponding of meltwater, and their sediments are now characterized by shallow thermokarst lakes. In the northwest map area, a large moraine complex formed perpendicular to ice flow. It consists of till, major moraine ridges, and glaciofluvial outwash sediments forming part of the western segment of a significant end moraine system referred to as the MacAlpine Moraine. Drumlins and crag-and-tails record a regional north-northwestward ice flow during the last glaciation. Active eolian activity can occur adjacent to rivers which have reworked and deposited alluvial sediments.
Summary(Plain Language Summary, not published)
The MacAlpine Lake map (NTS 66-L) identifies surficial materials and associated landforms left by the retreat of the last glaciers to have covered the area about 9000 years ago. The surficial geology is based on aerial photograph interpretation and limited previous 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.
GEOSCAN ID293616