| Title | Crag-and-tail features, Amundsen Gulf, Canadian Arctic Archipelago
|
| |
| Author | MacLean, B; Blasco, S; Bennett, R; Hughes Clarke, J; Patton, E |
| Source | Atlas of Submarine Glacial Landforms: Modern, Quaternary and Ancient; Geological Society Memoir no. 46, 2016 p. 53-54, https://doi.org/10.1144/M46.84 |
| Image |  |
| Year | 2016 |
| Alt Series | Earth Sciences Sector, Contribution Series 20150031 |
| Publisher | Geological Society of London |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf |
| Province | Northern offshore region |
| NTS | 97E/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 |
| Area | Amundsen Gulf |
| Lat/Long WENS | -123.0000 -122.7500 70.5667 70.5167 |
| Subjects | sedimentology; surficial geology/geomorphology; geophysics; ice movement; ice flow; ice transport directions; ice scars; seabottom topography; bathymetry; Beaufort Shelf |
| Illustrations | location maps; bathymetric profiles |
| Program | Public Safety
Geoscience Marine Geohazards |
| Released | 2016 11 30 |
| Abstract | Palaeo-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. |
| GEOSCAN ID | 296370 |
|
|