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TitleGlacial ice streams in eastern Parry Channel and adjoining major inlets, Canadian Arctic Archipelago
AuthorMacLean, B; Blasco, S; Bennett, R; Lakeman, T; Hughes-Clarke, J; Covill, R; Patton, E
SourceArcticNet 2013, annual scientific meeting, programme/ArcticNet 2013, annual scientific meeting, programme/ArcticNet 2013, réunion scientifique annuelle, programme; by ArcticNet; 2013 p. 123
Year2013
Alt SeriesEarth Sciences Sector, Contribution Series 20130334
PublisherArcticNet
MeetingArcticNet 2013; Halifax, NS; CA; December 9-13, 2013
Documentbook
Lang.English
Mediapaper; on-line; digital
File formatpdf
ProvinceNorthern offshore region
NTS57E; 57F; 57G; 57H; 67E; 67H; 38; 48; 58; 68; 39A; 39B; 49A; 49B; 59A; 59B; 69A; 69B; 79A
AreaParry Channel; Lancaster Sound; Barrow Strait; Peel Sound; Prince Regent Inlet
Lat/Long WENS-106.0000 -72.0000 77.0000 68.0000
Subjectsmarine geology; geophysics; surficial geology/geomorphology; geophysical surveys; lineations; bathymetry; seismic reflection surveys; submarine ridges; glaciers; glaciation
ProgramPublic Safety Geoscience - Coordination, Public Safety Geoscience
LinksArcticNet 2013 Proceedings online - en ligne (PDF, 3.08 MB)
AbstractMultibeam imagery and 3.5 kHz profiles have been acquired from CCGS Amundsen by ArcticNet and the Ocean Mapping Group at the University of New Brunswick along mainly widely spaced transects in Parry Channel and in several adjoining large inlets. These data together with single channel seismic reflection profiles acquired by the Geological Survey of Canada provide information on seafloor bathymetry, morphology and features, as well as seafloor and subsurface geology.
The occurrence of mega-scale ridge and groove lineations identified from multibeam imagery indicates that these waterways were occupied by fast flowing glacial ice streams on one or more occasion in the past. Limited chronological information suggests that the most recent of these events occurred during the Wisconsinan glaciation.
Ridge and groove lineations on the seafloor of eastern Parry Channel are less continuous than in Peel Sound and Amundsen Gulf farther west in the Northwest Passage, but are sufficiently numerous to document ice flow trends.
Deep bathymetry extending from Prince Regent, Admiralty and Navy Board inlets is continuous into Lancaster Sound and conforming ridge and groove lineation features indicate that glacial ice streams flowed northward from those inlets into Lancaster Sound. Preservation of those lineations suggests that ice flow from those inlets postdated any eastward flow of grounded glacial ice along Lancaster Sound from Prince Regent Inlet eastward.
A north-northeasterly trending ridge composed of ice-contact sediments identified from seismic reflection profiles in Lancaster Sound appears to have formed as a marginal moraine along the west side of the ice stream flowing out of Prince Regent Inlet or it possibly marks the boundary between Prince Regent ice and ice flowing eastward in Barrow Strait ¿ Lancaster Sound.
Multibeam imagery across the mouth of Wellington Channel shows mega-scale ridge and groove lineations indicative of a glacial ice stream entering Barrow Strait from the north through Wellington Channel. Farther west, lineation trends indicate that ice delivered by the ice stream in Peel Sound flowed to the east along Parry Channel. This appears to mark the westward limit of glacial ice streams flowing eastward along Parry Channel as bathymetric data and ridge and groove lineations indicate that the ice stream emanating from M¿Clintock Channel flowed to the west and northwest. The observed bathymetry and glacial bedforms indicate that both Laurentide and Innuitian ice streams contributed glacial ice to eastern Parry Channel.
Summary(Plain Language Summary, not published)
Multibeam imagery and 3.5 kHz profiles acquired from CCGS Amundsen by ArcticNet and the Ocean Mapping Group at the University of New Brunswick together with single channel seismic reflection profiles acquired by the Geological Survey of Canada provide information on seafloor bathymetry, morphology and features, as well as seafloor and subsurface geology in eastern Parry Channel and several large adjoining inlets. These data show that glacial ice streams flowed into eastern Parry Channel from both the Laurentide Ice Sheet to the south and the Innuitian Ice Sheet to the north.
GEOSCAN ID293340