GEOSCAN, résultats de la recherche

Menu GEOSCAN


TitreMiddle to Late Miocene slope failure and the generation of a regional unconformity beneath the western Scotian Slope, eastern Canada
AuteurCampbell, D C; Mosher, D C
SourceSubmarine mass movements and their consequences; par Mosher, D C (éd.); Advances in Natural and Technological Hazards Research vol. 28, 2010 p. 645-655, https://doi.org/10.1007/978-90-481-3071-9 52
Année2010
Séries alt.Secteur des sciences de la Terre, Contribution externe 20090125
ÉditeurSpringer Netherlands
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1007/978-90-481-3071-9 52
Mediapapier; en ligne; numérique
Référence reliéeCette publication est contenue dans Mosher, D C; Moscardelli, L; Shipp, R C; Chaytor, J D; Baxter, C D P; Lee, H J; Urgeles, R; (2010). Submarine mass movements and their consequences, Advances in Natural and Technological Hazards Research vol. 28
Formatshtml; pdf
ProvinceRégion extracotière de l'est
Lat/Long OENS -65.5000 -62.5000 43.0000 41.5000
Sujetsdépôts de pentes; glissements de pentes; stabilité des pentes; analyses de la stabilité des pentes; transport sous-marin; Miocène; transport des sediments; courants de fond; courants; levés géophysiques; levés de reflexion sismiques; études de réflexion; topographie du fond océanique; topographie du fond océanique; topographie; géologie marine; géophysique; Cénozoïque; Tertiaire
Illustrationslocation maps; seismic profiles
ProgrammeAléas géologiques et contraintes à la mise en valeur des ressources extracôtières, Géosciences à l'appui de la gestion des océans
Résumé(disponible en anglais seulement)
The global greenhouse to icehouse transition that occurred during the middle Cenozoic marked a major shift in the geological and oceanographic conditions in the northwest Atlantic Ocean. During this transition, strong contour currents developed and sediment input to the North American Basin increased. These events were coeval with the development of regional unconformities within the basin and along the basin margins. This study examines a widespread, Middle to Late Miocene age unconformity preserved below the western Scotian margin and demonstrates that it is primarily the product of erosion by regional submarine mass movement, although bottom currents and channel development may have played a role in its formation. The mass-transport deposits are among the largest reported in the literature. Despite the presence of a steep upper slope in the study area, the erosion is not due to masswasting initiated on the upper slope, but rather erosion and seabed failure initiated on the lower slope and continental rise, followed by failure retrogression. It is suggested that salt tectonics and bottom-current activity contributed to sediment failure.
GEOSCAN ID247638