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TitreDeltaic complexes of the Québec North Shore
AuteurDietrich, P; Normandeau, A; Lajeunesse, P; Ghienne, J -F; Schuster, M; Nutz, A
SourceLandscapes and landforms of eastern Canada; par Slaymaker, O (éd.); Catto, N (éd.); World Geomorphological Landscapes 2020 p. 245-258, https://doi.org/10.1007/978-3-030-35137-3 10
Année2020
Séries alt.Ressources naturelles Canada, Contribution externe 20170354
ÉditeurSpringer
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1007/978-3-030-35137-3 10
Mediapapier; en ligne; numérique
Formatspdf
ProvinceQuébec; Région extracotière de l'est
Lat/Long OENS -71.0000 -60.0000 52.0000 48.0000
Sujetsétudes côtières; milieu côtièr; deltas; sédiments deltaïques; graviers; sables; boues; dépôts glaciaires; sediments de contact glaciaire; cônes alluviaux; gîtes en forme de traînée; antecedents de sedimentation; antecedents glaciaires; déglaciation; marges glaciaires; retrait de la glace; changements du niveau de la mer; déplacement des sédiments; transport des sediments; paléodrainage; levés géophysiques; levés acoustiques marins; sonar latéral; bathymétrie; levés sismiques marins; caractéristiques sous-marines; cônes sous-marins; canyons sous-marins; chenaux; marges continentales; plate-forme continentale; bassins versants; bassins; méandres; plages soulevées; crêtes de plage; Calotte glaciaire Laurentide; deltas juxtaglaciaires; sédiments fluvioglaciaires; sédiments alluviaux; limites de submersion, marine; géologie marine; géologie des dépôts meubles/géomorphologie; sédimentologie; stratigraphie; géophysique; Nature et environnement; Sciences et technologie; Phanérozoïque; Cénozoïque; Quaternaire
Illustrationslocation maps; geoscientific sketch maps; digital elevation models; time series; satellite images; geophysical images; photographs; 3-D models
ProgrammeGéoscience pour la sécurité publique, Géo-risques marins
Diffusé2020 02 14
Résumé(disponible en anglais seulement)
One 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.
Résumé(Résumé en langage clair et simple, non publié)
Ce chapitre résume les principaux éléments morphologiques et stratigraphiques des deltas le long de la Côte-Nord du Québec.
GEOSCAN ID306565