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TitreGlacial ice streams in eastern Parry Channel and adjoining major inlets, Canadian Arctic Archipelago
AuteurMacLean, 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; par ArcticNet; 2013 p. 123
Année2013
Séries alt.Secteur des sciences de la Terre, Contribution externe 20130334
ÉditeurArcticNet
RéunionArcticNet 2013; Halifax, NS; CA; décembre 9-13, 2013
Documentlivre
Lang.anglais
Mediapapier; en ligne; numérique
Formatspdf
ProvinceRégion extracotière du nord
SNRC57E; 57F; 57G; 57H; 67E; 67H; 38; 48; 58; 68; 39A; 39B; 49A; 49B; 59A; 59B; 69A; 69B; 79A
Lat/Long OENS-106.0000 -72.0000 77.0000 68.0000
Sujetslevés géophysiques; linéations; bathymétrie; levés de reflexion sismiques; dorsales sous-marines; glaciers; glaciation; géologie marine; géophysique; géologie des dépôts meubles/géomorphologie
ProgrammeGéoscience pour la sécurité publique - gestionnaire, Géoscience pour la sécurité publique
LiensArcticNet 2013 Proceedings online - en ligne (PDF, 3.08 MB)
Résumé(disponible en anglais seulement)
Multibeam 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.
Résumé(Résumé en langage clair et simple, non publié)
L'imagerie radar multifaisceaux et les profils 3,5 kHz acquis à bord du NGCC Amundsen par ArcticNet et l'Ocean Mapping Group de l'Université du Nouveau-Brunswick, combinés à des profils de sismique réflexion monocanal acquis par la Commission géologique du Canada, fournissent de l'information sur la bathymétrie, la morphologie et les entités du fond marin, de même que sur la géologie du fond marin et de subsurface dans l'est du chenal Parry et dans plusieurs grands bras de mer avoisinants. Ces données indiquent que des courants glaciaires s¿écoulaient dans la partie est du chenal Parry en provenance à la fois de l'Inlandsis laurentidien au sud et de l'Inlandsis innuitien au nord.
GEOSCAN ID293340