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TitleSurficial geology, Lac Laporte, Quebec, NTS 23-P southwest
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorPaulen, R CORCID logo; Rice, J MORCID logo; Ross, MORCID logo
SourceGeological Survey of Canada, Canadian Geoscience Map 410, 2020, 1 sheet, Open Access logo Open Access
LinksSurficial geology map collection
LinksCollection de données de géologie de surface
PublisherNatural Resources Canada
Maps1 map
Map Info.surficial geology, sediments, landforms, features, 1:100,000
ProjectionUniversal Transverse Mercator Projection, UTM zone 20 (NAD83)
Mediaon-line; digital
RelatedNRCan photo(s) in this publication
RelatedThis publication is related to the following publications
RelatedThis publication is superceded by Surficial geology, Lac Laporte, Quebec, NTS 23-P southwest
File formatreadme
File formatpdf (Adobe® Reader®); rtf; gdb (ESRI® ArcGIS(TM) v.10.x); shp (ESRI® ArcGIS(TM) v.10.x); xml (ESRI® ArcGIS(TM) v.10.x); mxd (ESRI® ArcGIS(TM) 10.x); xls (Microsoft® Excel® 2010)
NTS23P/03; 23P/04; 23P/05; 23P/06
AreaLac Laporte
Lat/Long WENS -66.0000 -65.0000 55.5000 55.0000
Subjectssurficial geology/geomorphology; economic geology; Science and Technology; Nature and Environment; postglacial deposits; organic deposits; peat; swamps; bogs; fens; colluvial deposits; landslide deposits; fans; alluvial fans; glacial deposits; glacial features; glacial landforms; glacial lakes; beach ridges; ice contact deposits; eskers; flow trajectories; kames; tills; moraines; till ridges; kettles; meltwater channels; paleocurrents; drumlinoids; glacial flutings; crag and tail; lag deposits; glacial striations; glacial erosion; silts; gravels; sands; clays; boulders; clasts; shoreline changes; landforms; scarps; glacial erosion; till samples; glacial history; glaciation; glacial stages; Wisconsinian glacial stage; ice flow; deglaciation; ablation; ice stagnation; ice margins; ice retreat; depositional environment; sedimentary structures; bedrock geology; lithology; mineral occurrences; mineral potential; gold; Laurentide Ice Sheet; Ancestral Labrador Ice Divide; Glacial Lake Low; Core Zone; Doublet Zone; De Pas Batholith; Labrador Trough; New Quebec Orogen; Rachel-Laporte Zone; colluvial and mass-wasting deposits; colluvial and mass-wasting veneer; alluvial sediments; alluvial floodplain sediments; alluvial terraced sediments; lacustrine sediments; lacustrine beach sediments; lacustrine littoral sediments; lacustrine nearshore sediments; glaciolacustrine sediments; glaciolacustrine beach sediments; glaciolacustrine littoral sediments; glaciolacustrine nearshore sediments; glaciofluvial sediments; glaciofluvial outwash plain sediments; glaciofluvial terraced sediments; glaciofluvial outwash fan sediments; glaciofluvial hummocky sediments; glaciofluvial veneer; streamlined tills; till veneer; till blanket; beach crests; moraine ridges; ice-flow directions; outcrops; station locations; sample locations; subglacial meltwater corridors; Phanerozoic; Cenozoic; Quaternary
Illustrationslocation maps; index maps; photographs; photomicrographs
ProgramGEM2: Geo-mapping for Energy and Minerals Hudson/Ungava, Northeastern Quebec-Labrador, surficial geology
ProgramPolar Continental Shelf Program
Released2020 09 29
AbstractThe Lac Laporte area is of moderate relief and is characterized by till blankets in the central lowlands and till veneers with large expanses of bedrock outcrops in the west (Doublet Terrane) and east (De Pas Batholith). The region was differentially eroded by the Laurentide Ice Sheet, largely influenced by the migration of the Ancestral Labrador ice divide. Phases of radial ice flow from the former migrating ice divide imparted discordant erosional-flow landforms and paleo-flow indicators on the landscape. During the latter phase of deglaciation, terrain west of the Rivière De Pas experienced ice stagnation and ablation, with the westward-retreating ice margin pinned against the bedrock ridge crests. Subaerial meltwaters flowed eastward away from the ice margin, which created a morainal complex of winnowed till and glaciofluvial sediments. These subaerial meltwater channels are juxtaposed with the subglacial meltwater channels that formed parallel to the general north-south-trending bedrock topography.
Summary(Plain Language Summary, not published)
Surficial geology map of the Core Zone region, one map of eight being produced for the GEM2 Core Zone Surficial activity.

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