GEOSCAN, résultats de la recherche


TitreChapter 2: Continental shelves of Atlantic Canada
AuteurShaw, J; Todd, B J; Li, M Z; Mosher, D C; Kostylev, V E
SourceGeological Society Memoir no. 41, 2014 p. 7-19,
Séries alt.Secteur des sciences de la Terre, Contribution externe 20100147
ÉditeurGeological Society of London
Documentpublication en série
Mediapapier; en ligne; numérique
ProvinceRégion extracotière de l'est; Terre-Neuve-et-Labrador; Nouvelle-Écosse
Lat/Long OENS -68.0000 -50.0000 50.0000 41.0000
Sujetstalus continental; plate-forme continentale; marges continentales, atlantique; bancs; dépressions; sedimentation; sediments; antecedents glaciaires
Illustrationslocation maps; digital elevation models; 3-D models
ProgrammeGéoscience en mer, La géoscience pour les développements extracôtiers de la côte est
Diffusé2014 09 26
Résumé(disponible en anglais seulement)
The wide continental shelves of Atlantic Canada are characterized by a series of banks separated by transverse troughs. These shelves have been imprinted by repeated Quaternary glaciations, so that fluvial valleys have been deepened into fiords and shelf-crossing troughs, and a suite of glacigenic sediments has been deposited. In shallow areas the sea floor is shaped by waves and currents, including the strong tidal currents of the macrotidal Bay of Fundy. Glacigenic sediments have been reworked by modern processes to yield thick muds in basins, and thinner deposits of sand and gravel on wave-dominated banks and the littoral zone. As a result of a cold climate and the Labrador Current, seasonal sea ice occurs to varying degrees across the region, and iceberg impact continues on much of the Newfoundland and Labrador shelves. We classify Atlantic continental shelves into four regions, and focus on advances in understanding over the past several decades relating to: 1) processes on upper continental slopes; 2) glacial history in the last glacial cycle; 3) glacial landsystems; 4) geographic changes caused by glacio-isostasy; and 5) sediment mobility on the offshore banks. We conclude with a brief overview of the biota.