| Title | A belt of seabed erosion along the Beaufort Sea margin, offshore Northwest Territories, governed by Holocene evolution of the Beaufort Shelf-Break Jet; geological evidence, current measurements, and
initial oceanographic modelling |
| Download | Downloads |
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| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | King, E L; Li, M ;
Wu, Y; Forest, A; Blasco, S; Harrison, P; Robertson, A; Melling, H; Dallimore, S R; Paull, C K; Cameron, G D M |
| Source | Geological Survey of Canada, Open File 8198, 2017, 1 sheet, https://doi.org/10.4095/299691  Open Access |
| Image |  |
| Year | 2017 |
| Publisher | Natural Resources Canada |
| Document | open file |
| Lang. | English |
| Media | on-line; digital |
| File format | pdf |
| Province | Northern offshore region |
| NTS | 97F/12; 97F/13; 97G/04; 97G/05; 97G/12; 97G/13; 107E; 107F; 107G; 107H; 117E/01; 117E/02; 117E/07; 117E/08; 117E/09; 117E/10; 117E/15; 117E/16; 117H/01; 117H/02; 117H/07; 117H/08; 117H/09; 117H/10; 117H/15;
117H/16 |
| Area | Beaufort Sea; Beaufort Shelf; Amundsen Gulf |
| Lat/Long WENS | -138.5000 -127.5000 72.0000 70.0000 |
| Subjects | marine geology; surficial geology/geomorphology; engineering geology; geophysics; Holocene; continental margins; continental shelf; postglacial evolution; thermal history; marine sediments; muds;
erosion; permafrost; pingos; oceanography; currents; bathymetry; modelling; depositional history; depositional environment; sediment transport; gas seeps; gas seeps; seabottom temperatures; water temperature; collapse structures; slope failures;
diapirs; mass wasting; structural analyses; thermokarst; piston cores; core samples; geophysical surveys; seismic surveys, marine; acoustic surveys, marine; Beaufort Shelfbreak Jet (BSJ); Natural hazards; gas hydrates; Wind; Phanerozoic; Cenozoic;
Quaternary |
| Illustrations | geological sketch maps; profiles; seismic profiles; geophysical images; photographs; drawings; time series; models |
| Program | Public Safety
Geoscience Marine Geohazards |
| Program | Program of Energy Research and Development (PERD) |
| Released | 2017 04 12 |
| Summary | (Plain Language Summary, not published)
Removal of several metres thickness of stratified muds is recognized from penetration echosounder data along a narrow belt, 1-8km wide along the Beaufort
Sea shelf break (100-200m water depth). A corresponding zone of non-deposition (bypass) is bound by blankets of mud thickening away from the erosion/non-deposition belt. Long-term oceanographic moorings have previously demonstrated periodic currents
capable of mud re-suspension near the shelf break. Seabed instrumented measurement of the current and its effects on the mud behavior are pending. Radiocarbon dating indicates the erosion began about 6000 years ago. A combination of geologic,
oceanographic current data and 3-D oceanographic modelling approaches converge to indicate a strong birth/acceleration of the current at that time, presently recognized as the Beaufort Shelf-break Jet (BSJ). The study also helps constrain sediment
structural disturbance rates from seabed fluid/gas seeps in the area. |
| GEOSCAN ID | 299691 |
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