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TitreLate Quaternary geological history of the SW Grand Banks Slope and Rise off Green Bank and Whale Bank: implications for geohazard assessment
TéléchargerTéléchargements
AuteurLedger-Piercey, S; Piper, D J W
SourceCommission géologique du Canada, Dossier public 5663, 2007, 84 pages, https://doi.org/10.4095/224313 (Accès ouvert)
Image
Année2007
ÉditeurRessources naturelles Canada
Documentdossier public
Lang.anglais
DOIhttps://doi.org/10.4095/224313
Mediapapier; en ligne; numérique
Formatspdf
ProvinceRégion extracotière de l'est
Lat/Long OENS -55.5000 -54.2500 45.0000 44.2500
Sujetsmarges continentales; marges continentales, atlantique; glacis continental; talus continental; études de réflexion; levés de reflexion sismiques; transport des sediments; transport sous-marin; glissements de pentes; stabilité des pentes; analyses de la stabilité des pentes; dépôts de pentes; bathymétrie; carottages par piston; interpretations sismiques; caractéristiques structurales; failles; sedimentation; géologie des dépôts meubles/géomorphologie; stratigraphie; géologie marine; géophysique; Quaternaire; Cénozoïque
Illustrationssketch maps; seismic profiles; core logs
ProgrammeLes géosciences à l'appui de la gestion des océans, Aléas géologiques et contraintes à la mise en valeur des ressources extracôtières
ProgrammeLe Programme de recherche et de développement énergétiques (PRDE)
Diffusé2007 10 01; 2016 05 31
Résumé(disponible en anglais seulement)
A reconnaissance survey of late Quaternary stratigraphy and geohazards has been carried out on the deep continental margin seaward of Green Bank, Haddock Channel and Whale Bank, based on sparse Huntec sparker lines and seven new piston cores. The area is crossed by the large Haddock valley seaward of Haddock Channel. To the southeast, Whale Slope is relatively undissected, but the slope seaward of Green Bank is dissected by tributaries of Haddock and Halibut valleys. Five regional reflections were correlated throughout much of the study area in Huntec sparker profiles. The distribution of major mass-transport deposits, evacuation surfaces and headscarps was mapped. Most piston cores penetrated to between Heinrich layer 1 and the last glacial maximum and recovered principally mud. Cores adjacent to Haddock Valley contained abundant thin sand beds of late Pleistocene age. Cores were correlated with adjacent long core records on St Pierre Slope and at the Narwhal well site. Extrapolation of ages from cores suggests that the recurrence interval of regional failures is several tens of thousands of years. More frequent local failures are found at the foot of active fault scarps.
GEOSCAN ID224313