| Titre | Variations in rifting style and structure of the Scotian margin, Atlantic Canada, from 3D gravity inversion |
| Auteur | Dehler, S A; Welford, J K |
| Source | Conjugate divergent margins; Geological Society, Special Publication 369, 2012 p. 1-13, https://doi.org/10.1144/SP369.11 |
| Année | 2012 |
| Séries alt. | Secteur des sciences de la Terre, Contribution externe 20110207 |
| Éditeur | Geological Society of London |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1144/SP369.11 |
| Media | papier; en ligne; numérique |
| Formats | pdf |
| Province | Région extracotière de l'est; Nouvelle-Écosse |
| SNRC | 11A; 11B; 11C; 20P; 21A |
| Lat/Long OENS | -66.0000 -54.0000 45.0000 41.0000 |
| Sujets | décrochement horizontal; crevasses; interprétations de la pesanteur; levés gravimétriques; bathymétrie; analyses structurales; épaisseur de la croûte; études de la croûte; tectonique; géologie marine;
géophysique |
| Illustrations | location maps; profiles; plots |
| Programme | Analyse de bassin et ressources géoscientifiques, Géoscience en mer |
| Diffusé | 2012 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 ID | 289272 |
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