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TitleChannels and gullies on the continental slope seaward of a cross-shelf trough, Labrador margin, eastern Canada
AuthorDowdeswell, J A; Dowdeswell, E K; Todd, B J; Saint-Ange, F; Piper, D J W
SourceAtlas of submarine glacial landforms: modern, Quaternary and ancientw; 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 Memoir vol. 46, 2016 p. 385-386, https://doi.org/10.1144/M46.161
Year2016
Alt SeriesEarth Sciences Sector, Contribution Series 20150421
PublisherGeological Society of London (London)
Lang.English; English
Mediapaper; on-line; digital
File formatpdf
ProvinceEastern offshore region
AreaLabrador margin; Labrador shelf
Lat/Long WENS -57.6667 -57.2500 56.5333 56.1667
Subjectscross shelf-troughs; ice streams; till progradation; seafloor features; submarine landforms; Quaternary
Illustrationslocations maps; bathymetric profiles
ProgramMarine Geohazards, Public Safety Geoscience
AbstractThe Labrador Shelf is characterized by several cross-shelf troughs separated by intervening shallower banks. The troughs were probably occupied by fast-flowing ice streams in the Late Pleistocene. Hopedale Saddle trough has a long Quaternary history of till progradation at the shelf edge, and the modern continental slope developed over a major 0.3 Ma shelf-edge failure complex. The upper slope exhibits a series of relatively narrow and deep gullies, whereas the mid-slope contains wider and shallower channels that are locally anastomosing (Fig. 1a). The erosional submarine landforms on the slope are likely to be linked to the delivery of dense sediment-rich meltwater to the shelf edge from a full-glacial ice stream (Piper et al. 2012).
Summary(Plain Language Summary, not published)
The Labrador Shelf is characterised by several cross-shelf troughs separated by intervening shallower banks, a situation similar to that on many high-latitude continental shelves. The troughs were probably occupied by fast-flowing ice streams in the late Pleistocene. Hopedale Saddle trough has a long Quaternary history of till progradation at the shelf edge, and the modern continental slope developed over a major 0.3 Ma shelf-edge failure complex. Seaward, the upper continental slope exhibits a series of relatively narrow and deep gullies, whereas the mid-slope contains wider and shallower channels that are locally anastomosing. The erosional submarine landforms on the slope are likely to be linked to the delivery of dense sediment-rich meltwater to the shelf edge from a full-glacial ice stream.
GEOSCAN ID297558