| Titre | Late Quaternary geological history of the SW Grand Banks Slope and Rise off Green Bank and Whale Bank: implications for geohazard assessment |
| Télécharger | Téléchargements |
| Auteur | Ledger-Piercey, S; Piper, D J W |
| Source | Commission géologique du Canada, Dossier public 5663, 2007, 84 pages, https://doi.org/10.4095/224313 (Accès ouvert) |
| Image |  |
| Année | 2007 |
| Éditeur | Ressources naturelles Canada |
| Document | dossier public |
| Lang. | anglais |
| DOI | https://doi.org/10.4095/224313 |
| Media | papier; en ligne; numérique |
| Formats | pdf |
| Province | Région extracotière de l'est |
| Lat/Long OENS | -55.5000 -54.2500 45.0000 44.2500 |
| Sujets | marges 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 |
| Illustrations | sketch maps; seismic profiles; core logs |
| Programme | Les géosciences à l'appui de la gestion des océans, Aléas géologiques et contraintes à la mise en valeur des ressources extracôtières |
| Programme | Le Programme de
recherche et de développement énergétiques (PRDE) |
| Diffusé | 2007 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 ID | 224313 |
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