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TitleThe seafloor of southeastern Canada
AuthorNormandeau, AORCID logo; Piper, D J WORCID logo; Shaw, J; Todd, B JORCID logo; Campbell, D CORCID logo; Mosher, D CORCID logo
SourceLandscapes and landforms of eastern Canada; by Slaymaker, O (ed.); Catto, N (ed.); World Geomorphological Landscapes 2020 p. 453-471, 20
Alt SeriesNatural Resources Canada, Contribution Series 20170355
Mediapaper; on-line; digital
File formatpdf
ProvinceEastern offshore region; Newfoundland and Labrador; Nova Scotia; New Brunswick; Prince Edward Island; Quebec
Lat/Long WENS -71.0000 -42.0000 53.0000 38.0000
Subjectsmarine geology; surficial geology/geomorphology; sedimentology; geophysics; Nature and Environment; Science and Technology; continental margins; continental shelf; continental slope; seafloor topography; submarine features; submarine canyons; submarine troughs; submarine fans; tunnel valleys; abyssal plains; channels; seamounts; fiords; marine sediments; muds; glacial deposits; glacial landforms; moraines; moraine, end; moraine, de geer; drift deposits; landslide deposits; debris flow deposits; dunes; glacial history; ice sheets; glaciation; ice margins; deglaciation; ice retreat; sea level changes; depositional history; currents; turbidity currents; landslides; debris flows; slope stability; slope failures; erosion; sediment transport; gullies; paleogeography; paleodrainage; gas seeps; bedforms; geophysical surveys; acoustic surveys, marine; side-scan sonar; bathymetry; seismic interpretations; tectonic setting; isostatic rebound; Laurentide Ice Sheet; Last Glacial Maximum (Lgm); colluvial and mass-wasting deposits; ice streams; glaciomarine sediments; moraine ridges; Phanerozoic; Cenozoic; Quaternary
Illustrationslocation maps; geoscientific sketch maps; seismic profiles; bathymetric profiles; geophysical images
ProgramDelineating Canada's Continental Shelf Under UNCLOS
Released2020 02 14
AbstractQuaternary glaciations played a critical role in producing the modern landscape of the seafloor of southeastern Canada. Glacial landscapes such as cross-shelf troughs, fjords, recessional moraines and tunnel valleys were sculpted by the Laurentide Ice Sheet. Following deglaciation, relative sea level rise led to the formation of sandy bedforms and tidal scours on the continental shelf. In contrast, the deep-water margin was not directly modified by the ice sheet, but was significantly influenced by it. Large quantities of glacigenic sediments were distributed along the continental slope during the last glacial maximum through turbidity currents, contour currents and submarine landslides. Turbidity currents eroded submarine canyons and deposited submarine fans, which are among the largest sediment accumulations in southeastern Canada. Although the continental shelf and the deep-water margin have contrasting landscapes, they are genetically linked to tectonics and the pattern of retreat of the Laurentide Ice Sheet. This chapter gives an overview of the landscape and landforms of the seafloor of southeastern Canada and details how its glacial heritage played a major role in sculpting the modern seabed.
Summary(Plain Language Summary, not published)
This chapter summarizes the different landscapes and landforms observed on southeastern Canada's seafloor.

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