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TitrePalaeogeography of Atlantic Canada 13-0 kyr
AuteurShaw, J; Gareau, P; Courtney, R C
SourceQuaternary Science Reviews vol. 21, 2002 p. 1861-1878, https://doi.org/10.1016/S0277-3791(02)00004-5 (Accès ouvert)
LiensAbstract - Résumé
Année2002
Séries alt.Commission géologique du Canada, Contributions aux publications extérieures 2000300
ÉditeurElsevier BV
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1016/S0277-3791(02)00004-5
Mediapapier; en ligne; numérique
Formatspdf
ProvinceTerre-Neuve-et-Labrador; Nouveau-Brunswick; Nouvelle-Écosse; Île-du-Prince-Édouard; Québec
SNRC1; 2C; 2D; 2E; 2F; 2L; 10; 11; 12A; 12B; 12C; 12D; 12E; 12F; 12G; 12H; 12I; 12J; 12K; 12L; 20; 21A; 21B; 21F; 21G; 21H; 21I; 21J; 21K; 21N; 21O; 21P; 22A; 22B; 22C; 22F; 22G; 22H; 22I; 22J; 22K
Lat/Long OENS -70.0000 -47.0000 51.0000 41.0000
Sujetsmilieu côtièr; études côtières; changements du niveau de la mer; variations du niveau de la mer; Holocène; paléogéographie; plate-forme continentale; niveaux paléomers; géologie marine
Illustrationslocation maps; tables; geological sketch maps; graphs
Résumé(disponible en anglais seulement)
We combine isobase maps with a digital terrain model of Atlantic Canada to map coastlines from 13 14Ckyr BP to the present. At 13 14Ckyr BP there are ridges of high relative sea level (rsl) values over Newfoundland and the Maritime Provinces, and a re-entrant of low values in the Gulf of St. Lawrence. This pattern persists well into the Holocene, and reflects crustal response to the slow wasting of ice caps that persisted in Newfoundland and the Maritime Provinces for up to five millennia after the removal of ice from the Gulf of St. Lawrence by a migrating calving embayment. The palaeogeographic reconstructions reveal an archipelago on the outer shelf, from Grand Bank to the continent, that persisted from >13 14Ckyr BP until ca. 8 14Ckyr BP. Much of the Magdalen Shelf was exposed, but the Magdalen Islands were never connected to the mainland. Prince Edward Island was initially separated from the mainland, became connected after 11 14Ckyr BP, and was separated again just before 6 14Ckyr BP, when Northumberland Strait formed. The reconstructions are highly sensitive to relatively small changes in isobase values, especially on the shallow banks on the continental shelf.
GEOSCAN ID212134