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TitreSubmarine landslides in Arctic sedimentation: Canada Basin
AuteurMosher, D C; Shimeld, J; Hutchinson, D; Lebedeva-Ivanova, N; Chapman, C B
SourceSubmarine mass movements and their consequences; par Yamada, Y (éd.); Kawamura, K (éd.); Ikehara, K (éd.); Ogawa, Y (éd.); Urgeles, R (éd.); Mosher, D (éd.); Chaytor, J (éd.); Strasser, M (éd.); Advances in Natural and Technological Hazards Research vol. 31, 2012 p. 147-157, 13
Séries alt.Secteur des sciences de la Terre, Contribution externe 20110180
ÉditeurSpringer Netherlands
Documentpublication en série
DOI 13
Mediapapier; en ligne; numérique
ProvinceRégion extracotière du nord
Lat/Long OENS-148.0000 -128.0000 78.0000 70.0000
Sujetstransport sous-marin; caractéristiques sous-marines; sédiments marins; sédiments marins; transport des sediments; glissements de terrain; glissements de pentes; stabilité des pentes; tsunami; levés de reflexion sismiques; géologie marine; géophysique
Illustrationslocation maps; profiles
ProgrammePreparation of a submission for an extended continental shelf in the Atlantic and Arctic Oceans under UNCLOS, Délimitation du plateau continental du Canada en vertu de la Convention des Nations Unies sur le droit de la mer (UNCLOS)
Diffusé2011 09 15
Résumé(disponible en anglais seulement)
Canada Basin of the Arctic Ocean is the least studied ocean basin in the World. Marine seismic field programs were conducted over the past 6 years using Canadian and American icebreakers. These expeditions acquired more than 14,000 line-km of multibeam bathymetric and multi-channel seismic reflection data over abyssal plain, continental rise and slope regions of Canada Basin; areas where little or no seismic reflection data existed previously. Canada Basin is a turbidite-filled basin with flat-lying reflections correlateable over 100s of km. For the upper half of the sedimentary succession, evidence of sedimentary processes other than turbidity current deposition is rare. The Canadian Archipelago and Beaufort Sea margins host stacked mass transport deposits from which many of these turbidites appear to derive. The stratigraphic succession of the MacKenzie River fan is dominated by mass transport deposits; one such complex is in excess of 132,000 km2 in area and underlies much of the southern abyssal plain. The modern seafloor is also scarred with escarpments and mass failure deposits; evidence that submarine landsliding is an ongoing process. In its latest phase of development, Canada Basin is geomorphologically confined with stable oceanographic structure, resulting in restricted depositional/reworking processes. The sedimentary record, therefore, underscores the significance of mass-transport processes in providing sediments to oceanic abyssal plains as few other basins are able to do.