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TitleMoat 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; by Dowdeswell, J A (ed.); Canals, M (ed.); Jakobsson, M (ed.); Todd, B JORCID logo (ed.); Dowdeswell, E K (ed.); Hogan, K A (ed.) ; Geological Society of London; Geological Society Memoir no. 46, 2016 p. 51-52,
Alt SeriesEarth Sciences Sector, Contribution Series 20150068
PublisherGeological Society of London
Mediapaper; on-line; digital
File formatpdf
ProvinceNorthern offshore region
NTS97G/03; 97G/04; 97G/05; 97G/06
AreaAmundsen Gulf
Lat/Long WENS-125.6333 -125.5500 71.3167 71.2833
Subjectsseafloor topography; ice movement; glacial landforms; drumlinoids; submarine ridges; submarine features
Illustrationslocation maps; bathymetric profiles
ProgramPublic Safety Geoscience Marine Geohazards
Released2016 11 30
AbstractMultibeam sonar imagery provides evidence of depositional and erosional seafloor features emplaced by a glacial ice stream that flowed through Amundsen Gulf into the Beaufort Sea during the last glaciation.
Summary(Plain Language Summary, not published)
Prominent seafloor bedforms in Amundsen Gulf include parallel mega-scale ridges and grooves that trend northwesterly across the region. Depressions up to 135 m wide and 45 m deep occur as interruptions in many of the ridges. The linear interruptions extend across adjoining ridges along trends that lie approximately normal to the trend of the ridges. Arcuate shaped depressions (moats) connect with wider inter-ridge valleys trending to the northwest. These linear features are interpreted to have formed beneath a fast flowing glacial ice stream originating out of eastern Amundsen Gulf. The high seabed slope angles associated with these features could pose a hazard to any future marine infrastructure in the area.

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