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TitreVariations in rifting style and structure of the Scotian margin, Atlantic Canada, from 3D gravity inversion
AuteurDehler, S A; Welford, J K
SourceConjugate divergent margins; Geological Society, Special Publication 369, 2012 p. 1-13, https://doi.org/10.1144/SP369.11
Année2012
Séries alt.Secteur des sciences de la Terre, Contribution externe 20110207
ÉditeurGeological Society of London
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1144/SP369.11
Mediapapier; en ligne; numérique
Formatspdf
ProvinceRégion extracotière de l'est; Nouvelle-Écosse
SNRC11A; 11B; 11C; 20P; 21A
Lat/Long OENS-66.0000 -54.0000 45.0000 41.0000
Sujetsdécrochement horizontal; crevasses; interprétations de la pesanteur; levés gravimétriques; bathymétrie; analyses structurales; épaisseur de la croûte; études de la croûte; tectonique; géologie marine; géophysique
Illustrationslocation maps; profiles; plots
ProgrammeAnalyse de bassin et ressources géoscientifiques, Géoscience en mer
Diffusé2012 03 19
Résumé(disponible en anglais seulement)
We use regional gravity data and a 3D inversion approach to examine variations in crustal thickness and to extend seismic-based interpretations along the Scotian margin, Atlantic Canada. Constraints on Moho, crust and sedimentary layers were based on seismic refraction models and profiles of deep multichannel seismic data. A sub-surface 3D density anomaly distribution was developed, using initial constraints from bathymetric data and seismic basement depth estimates.
Predictions from the model include a regional map of Moho structure and depth slices that allow comparison with seismic interpretations. The model predictions of variable width of crustal extension and northward thinning of oceanic crust agree with the seismic profiles. The pattern of crustal thinning (beta) predicted by the density anomaly model shows significantly greater thinning beneath the northern margin, separated from more uniform thinning to the southwest by a pronounced boundary and possible transfer zone.
GEOSCAN ID289272