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TitleCanyons and slides on the continental slope seaward of a shallow bank, Labrador margin, eastern Canada
AuthorDowdeswell, E K; Todd, B J; Dowdeswell, J A
SourceAtlas of submarine glacial landforms : Modern, Quaternary and ancient; by Dowdeswell, J A (ed.); Canals, M (ed.); Jakobsson, M (ed.); Todd, B J (ed.); Dowdeswell, E K (ed.); Hogan, K A (ed.); Geological Society, Memoirs vol. 46, 2016 p. 405-406,
Alt SeriesEarth Sciences Sector, Contribution Series 20150158
PublisherGeological Society of London (London)
Mediapaper; on-line; digital
File formatpdf
ProvinceEastern offshore region
AreaHopedale Saddle; Makkovik Bank; Labrador Continental shelf
Lat/Long WENS -57.4167 -56.7500 56.7500 55.7833
Subjectsglacial reconstructions; sediment destabilization features; multibeam data; Quaternary
Illustrationslocation maps; bathymetric profiles; seismic reflection profiles
ProgramMarine Geohazards, Public Safety Geoscience
AbstractThe Labrador continental shelf (c. 200 km wide) consists of a series of shallow banks and intervening cross-shelf troughs (Fig. 1b). Glacial reconstructions suggest that the banks were occupied by slow-flowing ice and the troughs by ice streams during several Quaternary glaciations (Josenhans et al. 1986; Dyke et al. 2002; Margold et al. 2015). On the continental slope offshore of the Makkovik Bank-southern Hopedale Saddle region, several submarine canyons and interfluves with numerous sediment destabilization features are visible in multibeam data (Fig. 1a).
Summary(Plain Language Summary, not published)
The continental shelf along the eastern coastline of Labrador extends roughly 200 km to the shelf edge where water depths reach about 500 m. Along its length, orientated northwest to southeast, the Labrador margin exhibits a series of banks separated by southwest to northeast trending cross-shelf troughs reaching maximum depths of just over 800 m. Quaternary deposits on the shelf consist of glacial till and glacimarine silts under a thin covering of post-glacial muds in basins. The cross-shelf troughs represent exit points for ice-streams flowing northeastward during the later phases of Laurentide Ice Sheet deglaciation. Further seaward, in the southernmost Hopedale Saddle region between Makkovik Bank to the south and Nain Bank to the north, the continental slope between the former ice streams is characterised by canyons and slides.