GEOSCAN, résultats de la recherche


TitreRelationships between sediment mass-failure modes and magnitudes in the evolution of the Scotian Slope, offshore Nova Scotia
AuteurCampbell, D C; Shimeld, J W; Mosher, D C; Piper, D J W
SourceProceedings of the 2004 Offshore Technology Conference; 16743, 2004 p. 1-14,
Séries alt.Commission géologique du Canada, Contributions aux publications extérieures 2003285
ÉditeurOffshore Technology Conference
Réunion2004 Offshore Technology Conference; Houston, TX; US; mai 3-6, 2004
Documentfichier d'ordinateur
MediaCD-ROM; numérique; en ligne
ProvinceRégion extracotière
SNRC10; 11A; 11B; 11C; 11D; 11E; 11F; 11G; 11H; 11I; 11J; 11K; 11L; 20G; 20H; 20I; 20J; 20O; 20P; 21A; 21B; 21G; 21H; 21I; 21J
Lat/Long OENS -68.0000 -53.0000 47.5000 40.0000
Sujetstalus continental; dépôts de pentes; glissements de pentes; stabilité des pentes; levés de reflexion sismiques; données sismiques; profils sismiques marins; levés sismiques marins; géologie marine; sédimentologie; géologie des dépôts meubles/géomorphologie; géophysique
Illustrationsseismic images; seismic profiles; seismic reflection profiles; cross-sections stratigraphic; 3-D images; seismic images; satellite imagery; digital images; graphs
Diffusé2013 04 08
Résumé(disponible en anglais seulement)
The role of seabed failure in the regional development of continental margins is not well reported in the literature. Recently, large amounts of scientific and industry seismic reflection data have been collected along the Scotian margin, offshore Nova Scotia. The new datasets allow for the regional assessment of the complete range of magnitude and recurrence of seabed failure for this area, from a time dominated by prodeltaic sedimentation to a time dominated by proglacial sedimentation. The results show that large scale seabed failure was uncommon during the early Tertiary, but became widespread after ? 40 Ma. Failure deposits are more abundant on the eastern and western portions of the margin compared tothe central portion. The largest failure deposits observed on the margin occurred during non-glacial periods, whereas the highest recurrence of failure occurred during periods of deglaciation. The modern slope of the seabed, from shelf break to continental rise, appears to be related to seabed failure history, with exponential slope curvature in areas of large-scale or abundant failure and linear slope curvature in areas of small-scale failure. Several glacial and non-glacial related trigger mechanisms are possible, but more research and improved age control is required to identify which were active.