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TitleA 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
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AuthorKing, 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
SourceGeological Survey of Canada, Open File 8198, 2017, 1 sheet, https://doi.org/10.4095/299691
Year2017
PublisherNatural Resources Canada
Documentopen file
Lang.English
Mediaon-line; digital
File formatpdf
ProvinceNorthern offshore region
NTS97F/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
AreaBeaufort Sea; Beaufort Shelf; Amundsen Gulf
Lat/Long WENS-138.5000 -127.5000 72.0000 70.0000
Subjectsmarine 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; geological hazards; permafrost degradation; gas hydrates; sediment disturbance; seabed erosion; structural disturbance; pingo-like features (PLF); moorings; wind; multibeam bathymetry; Phanerozoic; Cenozoic; Quaternary
Illustrationsgeological sketch maps; profiles; seismic profiles; geophysical images; photographs; drawings; time series; models
ProgramMarine Geohazards, Public Safety Geoscience
ProgramProgram of Energy Research and Development (PERD)
Image
Released2017 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 ID299691