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TitleDeltaic complexes of the Québec North Shore
AuthorDietrich, P; Normandeau, AORCID logo; Lajeunesse, P; Ghienne, J -F; Schuster, M; Nutz, A
SourceLandscapes and landforms of eastern Canada; by Slaymaker, O (ed.); Catto, N (ed.); World Geomorphological Landscapes 2020 p. 245-258, 10
Alt SeriesNatural Resources Canada, Contribution Series 20170354
Mediapaper; on-line; digital
File formatpdf
ProvinceQuebec; Eastern offshore region
AreaSt. Lawrence Estuary; Gulf of St. Lawrence; Côte-Nord; Portneuf; Manicouagan; Lac Pentecôte; Sept-Iles; Rivière St-Jean
Lat/Long WENS -71.0000 -60.0000 52.0000 48.0000
Subjectsmarine geology; surficial geology/geomorphology; sedimentology; stratigraphy; geophysics; Nature and Environment; Science and Technology; coastal studies; coastal environment; deltas; deltaic sediments; gravels; sands; muds; glacial deposits; ice contact deposits; fans; channel deposits; depositional history; glacial history; deglaciation; ice margins; ice retreat; sea level changes; sediment reworking; sediment transport; paleodrainage; geophysical surveys; acoustic surveys, marine; side-scan sonar; bathymetry; seismic surveys, marine; submarine features; submarine fans; submarine canyons; channels; continental margins; continental shelf; watersheds; basins; meanders; raised beaches; beach ridges; Laurentide Ice Sheet; Goldthwait Sea; ice-contact deltas; glaciofluvial sediments; alluvial sediments; limit of submergence, marine; Phanerozoic; Cenozoic; Quaternary
Illustrationslocation maps; geoscientific sketch maps; digital elevation models; time series; satellite images; geophysical images; photographs; 3-D models
ProgramPublic Safety Geoscience Marine Geohazards
Released2020 02 14
AbstractOne of the most particular morphological features of the Québec North Shore (North Shore of the Estuary and Gulf of the St. Lawrence, eastern Canada) is the occurrence of deltaic complexes that form thick and extensive sediment bodies (gravel, sand and mud) along the modern coastline. The deltaic complexes were emplaced during the retreat of the Laurentide Ice Sheet from the region that commenced about 11 ka in the context of falling relative sea level. Deltaic complexes are made up of three distinct, superimposed depositional systems, consisting of: (1) ice-contact subaqueous fans and deltas, (2) ice-distal glacifluvial deltas, and (3) coastal suites and meandering channel belts. Ice-contact systems were emplaced immediately after deglaciation of the region at the front of the ice-margins. Subsequent ice retreat fed glacifluvial deltas in meltwater and glacigenic sediments until the complete retreat of the ice-margin from the drainage basin a few thousand years ago. The resulting shutdown in sediment supply led to the reworking of the now-inactive glacifluvial deltas by shore-related and fluvial processes that resulted in the deposition of coastal suites and meander channel belts. Submarine sediment accumulations and related morphologies revealed by high-resolution swath bathymetric and seismostratigraphic data collected off these deltaic complexes are the subaqueous counterparts of these deltas. The modern evolution of these deltaic complexes is controlled by the reworking, transport, and deposition of sediments by shore-related processes along the coast, on the shallow shelf, and through submarine channels and canyons.
Summary(Plain Language Summary, not published)
This chapter summarizes the main morphological and stratigraphic elements of deltas along the Québec North Shore.

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