| Titre | A glacial landform assemblage in Placentia Bay, Newfoundland, eastern Canada |
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| Auteur | Shaw, J |
| Source | Atlas of submarine glacial landforms: modern, Quaternary and ancient; par Dowdeswell, J A (éd.); Canals, M (éd.); Jakobsson, M (éd.); Todd, B J (éd.); Dowdeswell, E K (éd.); Hogan, K A (éd.); Geological Society Memoir no. 46,
2016 p. 139-142, https://doi.org/10.1144/M46.141 |
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| Année | 2016 |
| Séries alt. | Secteur des sciences de la Terre, Contribution externe 20150181 |
| Éditeur | Geological Society of London |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1144/M46.141 |
| Media | papier; en ligne; numérique |
| Formats | pdf |
| Programme | Géoscience en mer |
| Diffusé | 2016 01 01 |
| Résumé | (disponible en anglais seulement)
Placentia Bay, located on the south coast of the island of Newfoundland, is bounded to the west by Burin Peninsula and to the east by Avalon Peninsula (Fig.
1a). At the Last Glacial Maximum (LGM) the Laurentide Ice Sheet extended south of the bay, reaching the edge of the continental shelf (Shaw et al. 2006). Placentia Bay was an onset region for fast-flowing ice in Halibut Channel, a cross-shelf trough
beyond the bay. The bay became ice free at c. 14 ka, by which time retreat of Laurentide ice had isolated a Newfoundland ice cap. Placentia Bay has been mapped with multibeam sonar and surveyed with sub-bottom profilers. Results from these activities
are contained in 1:50 000 scale shaded-relief maps, backscatter strength maps, a 'seascape' map (Shaw et al. 2011) and in various papers (e.g. Brushett et al. 2007; Shaw et al. 2009). The landform assemblage includes: (1) glacially overdeepened
troughs; (2) streamlined sedimentary landforms; (3) rock drumlins; (4) flutes overprinting sedimentary drumlins; (5) De Geer moraines superimposed on streamlined landforms; (6) a complex landform suite comprising coast-parallel moraines, drumlins and
megaflutes, eskers and hummocky moraine; (7) transverse moraines; (8) submarine slides; and (9) paraglacially modified terrain. |
| Sommaire | (Résumé en langage clair et simple, non publié)
Une équipe internationale de scientifiques compile en un atlas des exemples de topographie océanique façonnée par les glaciers et provenant du
monde entier. La présente contribution est l¿un des trois exemples sur l¿est du Canada présentés par cet auteur. Cet atlas facilitera l¿interprétation des données du plancher océanique à l¿appui de l¿élaboration de ressources d¿hydrocarbures au large
des côtes. |
| GEOSCAN ID | 296876 |
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