GEOSCAN, résultats de la recherche


TitreLarge submarine sand wave fields on Georges Bank, Gulf of Maine, Atlantic Canada
AuteurTodd, B J; Valentine, P C
SourceGeoHab 2010, characterisation, quantification and diversity of extreme habitats, conference handbook, programme & abstracts; par Lamarche, G (éd.); 2010 p. 144
LiensOnline - En ligne
Séries alt.Secteur des sciences de la Terre, Contribution externe 20090413
RéunionGeoHab 10th International Conference; Wellington; NZ; mai 4-7, 2010
Mediapapier; en ligne; numérique
ProvinceRégion extracotière de l'est
Sujetscaractéristiques sous-marines; transport sous-marin; plate-forme continentale; dépôts glaciaires; topographie glaciaire; géologie marine; géologie des dépôts meubles/géomorphologie
ProgrammeGéoscience en mer, Énergie renouvelable offshore
Résumé(disponible en anglais seulement)
Georges Bank is a large continental shelf feature (150 x 280 km) that rises more than 300 m above the Gulf of Maine sea floor. The Canadian part of the bank surface (~7900 km2) ranges in depth from 38 to 200 m at the continental shelf break. The bank is mantled with a veneer of glacial debris transported during the late Pleistocene from continental areas lying to the north. These sediments were reworked by marine processes during sea level transgression andcontinue to be modified by the modern oceanic regime. The most prominent bedforms on Georges Bank are large, semi-mobile sand waves up to 19 m in height formed through sediment transport by strong tidal and storm currents. Well-defined bedform crest lines up to15 km long form a complex anastomosing pattern having an overall southwest - northeast strike, which is perpendicular to the direction of dominant current flow.