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TitreHudson 2005023 cruise report: geological investigations in Northeast Channel and the adjacent slope, Scotian Shelf
AuteurKing, E L; Brown, O; Chapman, B; Cameron, G; Fraser, P; Girouard, P; MacKinnon, W; Piper, D; Uyesugi, M
SourceCommission géologique du Canada, Dossier public 5058, 2005, 94 pages; 1 CD-ROM, (Accès ouvert)
LiensGeological Survey of Canada Atlantic - Expedition Database (ED)
LiensBase de données d'expédition (ED)
ÉditeurRessources naturelles Canada
Documentdossier public
MediaCD-ROM; numérique; en ligne
Formatsdbf (ESRI®ArcView® 3.x, ArcGIS®8.3 or later); doc (Microsoft Word); jpg; mpg; pdf (Adobe® Acrobat® Reader® v. 5.1 is included / est fourni); prj (ESRI®ArcView® 3.x, ArcGIS®8.3 or later); shp (ESRI®ArcView® 3.x, ArcGIS®8.3 or later); tif; txt; xls (Microsoft Excel)
ProvinceRégion extracotière de l'est
SNRC20G; 20H; 20I; 20J
Lat/Long OENS -66.5000 -64.5000 42.5000 41.5000
Sujetsplate-forme continentale; talus continental; secousses séismiques; glissements de pentes; glissements de terrain; hydrocarbures; pipelines; chenaux; configurations lit; levés géophysiques; levés de reflexion sismiques; levés sismiques, navire; levés sismiques; sonar latéral; sédiments de fond; stabilité du sédiment; sonar latéral; échantillons prélevés au hasard; levés acoustiques marins; photographie; carottes de sédiment marin; carottages par piston; antecedents glaciaires; dépôts glaciaires; elements glaciaires; tills; dunes hydrauliques; déplacement de la configuration lit; sédiments marins; canyons sous-marins; transport des sediments; érosion; stratification; Holocène; stabilité des pentes; marées; courants; fosses abyssales; courants de turbidite; profils sismiques marins; Wisconsinien; moraines; affouillement; icebergs; failles; sables; graviers; Plate-Forme de Néo-écossaise; géophysique; géologie marine; géologie des dépôts meubles/géomorphologie; combustibles fossiles; Phanérozoïque; Cénozoïque; Quaternaire; Tertiaire
Illustrationstables; digital elevation models; photographs; sketch maps; multibeam images; seismic profiles; sidescan images; plots; graphs
ProgrammeLes géosciences à l'appui de la gestion des océans
ProgrammeLe Programme de recherche et de développement énergétiques (PRDE)
Diffusé2005 12 01
Résumé(Sommaire disponible en anglais seulement)
The Northeast Channel was occupied by an ice stream but the outer mouth geologic section suggests this was not frequently. The sequence of Quaternary events left a simple record of well-developed canyons cut in a thin Quaternary sediment record and truncated by perhaps only one generation of large channels with glacigenic infill. This was followed by till deposition extending to the shelf break in more than on phase but only two or three phases are preserved. Sandwave fields previously identified from multibeam images are complex in terms of their pattern and superposition of smaller bedforms. Some are more relict than previously understood while the general setting is one of high sand mobility even outside bedform fields. The new data will allow better volume, mobility and flux estimates and provide a proper setting for deployment of the seabed monitoring instrument, RALPH, summer 2006. Sediment mobility extending to the channel-mouth canyons suggests periodic noncohesive failure may occur. On the slope, piston cores will constrain the sediment type and age of erosional horizons off Northeast Channel. While the eastern canyons appear to supply sediment during glacial periods, there may be significant Holocene transport and erosion in the southwesterly canyon. The highly dissected upper slope off Georges Bank contains some diamict, likely till, which was cored. An upper slope till off Browns Bank shows a transition to stratified sediment transition. The area off SW Browns Bank has a large (buried) failure but there is also evidence for a widespread surface failure. One sample 6 can potentially allow dating of the youngest failure. These data will contribute to the current assessment of the frequency of large earthquakes on the Scotian Slope.