GEOSCAN, résultats de la recherche


TitreSedimentation in Canada Basin, western Arctic
AuteurMosher, D C; Shimeld, J; Jackson, R; Hutchinson, D; Chapman, C B; Chian, D; Childs, J; Mayer, L; Edwards, B; Verhoef, J
SourceCommission géologique du Canada, Dossier public 6759, 2011, 1 feuille, (Accès ouvert)
ÉditeurRessources naturelles Canada
Documentdossier public
Mediaen ligne; numérique; papier
Formatspdf; JPEG2000
ProvinceRégion extracotière du nord
Lat/Long OENS-180.0000 -96.0000 83.0000 70.0000
Sujetslevés géophysiques; interpretations sismiques; levés sismiques; levés de reflexion sismiques; levés sismiques marins; levés de refraction sismiques; marges continentales; bathymétrie; topographie du fond océanique; topographie du fond océanique; Bassin de Canada ; géologie marine; géophysique
Illustrationslocation maps; tables; profiles; seismic images; seismic profiles
ProgrammePréparation d'une soumission pour un plateau continental élargi dans les océans Atlantique et Arctique sur le droit de la mer (UNCLOS), Délimitation du plateau continental du Canada en vertu de la Convention des Nations Unies sur le droit de la mer (UNCLOS)
Diffusé2011 03 01
Résumé(disponible en anglais seulement)
Canada Basin of the western Arctic Ocean is the least studied ocean basin in the World. Marine seismic field programs were conducted during the past 5 years in order to study the geology, sedimentary history and geomorphology of the region. As part of this program, five annual icebreaker expeditions acquired bathymetric, seismic reflection and seismic refraction data on a regional scale. More than 12,000 line-km of multi-channel seismic reflection data and 120 sonobuoy seismic refraction records over abyssal plain and continental rise regions of Canada Basin, Northwind Ridge and Alpha Ridge were acquired. The success of these programs was achieved through novel technical modifications to seismic equipment to permit towing in heavy ice conditions and through collaboration between multiple Canadian and US agencies and institutions, enabling utilization of two ice breakers during seismic and multibeam data acquisition in heavy ice.
The seafloor of Canada Basin is remarkably flat-lying in its central region, with little bathymetric change over most of its extent. The sedimentary succession is generally flat lying with reflections extending over 100's of km. These reflections infill basement topography and onlap bathymetric highs, such as Alpha and Northwind ridges. The sedimentary succession is thickest in the Beaufort Sea region, reaching more than 10 km, and generally thins to the north and west. Reflection characteristics suggest that sediment volume input to the Arctic Ocean has been high and dominated by turbidity current deposition, similar to Amundsen and Nansen Basins of the Eurasian Basin. These turbidites originate from the eastern and southern continental margins. There is no evidence of contemporaneous or post-depositional reworking by bottom currents. Additionally, there is little evidence of tectonic deformation after primary basin-forming events except in the NE quadrant, nearer Alpha Ridge.