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TitreA large, glacially modified, shelf-edge canyon, Scotian Shelf, Atlantic Canada
AuteurCameron, G D M; King, E L; Todd, B J
SourceAtlas of Submarine Glacial Landforms: Modern, Quaternary and Ancient; Geological Society Memoir no. 46, 2016 p. 403-404, https://doi.org/10.1144/M46.115
Année2016
Séries alt.Secteur des sciences de la Terre, Contribution externe 20140571
ÉditeurThe Geological Society of London
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1144/M46.115
Mediapapier; en ligne; numérique
Formatspdf
ProvinceRégion extracotière de l'est
Lat/Long OENS -59.3333 -58.8333 44.1667 43.6667
Sujetscanyons sous-marins; erosion glaciaire; antecedents glaciaires; chenaux d'eau de fonte; erosion glaciaire; surfaces d'érosion; grès; plate-forme continentale; talus continental; courants de turbidite; Cénozoïque
Illustrationslocation maps; bathymetric profiles
ProgrammeRisques géo marines, Géoscience pour la sécurité publique
Résumé(disponible en anglais seulement)
Located on the Scotian shelf, The Gully is the largest submarine canyon on the outer southeastern Canadian continental margin (Fig. 1a, f). It appears morphologically similar to many other canyons on the Scotian Slope; however, it indents the continental shelf much deeper than other canyons, connecting the middle shelf to the continental slope. It is generally recognized that The Gully formed by fluvial, glacial, and meltwater erosion (Fader et al. 1998) that cut deeply into Cenozoic mudstone and sandstone units. It was excavated over the past million years as successive continental glaciations lowered sea level, exposing the shelf and allowing rivers to erode and deposit sediments near the top of the continental slope. The Gully was also partially eroded by turbidity currents that flowed down the canyon at times of glacial maxima.
Résumé(Résumé en langage clair et simple, non publié)
Présentant les caractéristiques glaciaires et du relief d'un grand canyon sous-marin et résumant son histoire géologique.
GEOSCAN ID296237