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TitleCrag-and-tail features, Amundsen Gulf, Canadian Arctic Archipelago
AuthorMacLean, B; Blasco, S; Bennett, R; Hughes Clarke, J; Patton, E
SourceAtlas of Submarine Glacial Landforms: Modern, Quaternary and Ancient; Geological Society Memoir no. 46, 2016 p. 53-54,
Alt SeriesEarth Sciences Sector, Contribution Series 20150031
PublisherGeological Society of London
Mediapaper; on-line; digital
File formatpdf
ProvinceNorthern offshore region
NTS97E/02; 97E/04; 97E/03; 97E/05; 97E/06; 97E/07; 97E/10; 97E/11; 97E/12; 97E/13; 97E/14; 97E/15; 97F/01; 97F/08; 97F/09; 97F/16
AreaAmundsen Gulf
Lat/Long WENS-123.0000 -122.7500 70.5667 70.5167
Subjectssedimentology; surficial geology/geomorphology; geophysics; ice movement; ice flow; ice transport directions; ice scars; seabottom topography; bathymetry; Beaufort Shelf
Illustrationslocation maps; bathymetric profiles
ProgramPublic Safety Geoscience Marine Geohazards
Released2016 11 30
AbstractPalaeo-ice streams existed in many marine channels of the Canadian Arctic Archipelago (e.g. Clark & Stokes 2001; Stokes et al. 2006; MacLean et al. 2010, 2015). These include Amundsen Gulf at the southwestern end of the Northwest Passage, where multibeam imagery has revealed a variety of subglacial features (Stokes et al. 2006; MacLean et al. 2012, 2015) (Fig. 1a, b). Six or more stacked ice-contact deposits in NW Amundsen Gulf indicate successive advances of a grounded ice stream from a pinning point on the rocky shallow seabed south of Banks Island. Stokes et al. (2006) also considered this to be a pinning point for the ice stream. Further evidence of the dynamic nature of glacial events in Amundsen Gulf is provided by Batchelor et al. (2014), who recognized sediment sequences deposited by eight individual Amundsen Gulf ice streams or readvances of the same ice stream in the outer gulf and on the Beaufort Shelf.
Summary(Plain Language Summary, not published)
Glacial ice streams formerly existed in many of the marine channels of the Canadian Arctic. These include Amundsen Gulf, which lies at the southwestern end of the Northwest Passage, where multi-beam imagery has revealed a variety of sub-glacial features. These sub-glacial features include streamlined drumlins and glacial lineations which are considered a geohazard as they would adversely affect any seabed infrastructure due to their steep slopes.

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