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TitleThe Cabot Lake ice-stream: a hard-bedded palaeo-ice-stream near the Ancestral Labrador Ice-Divide of the Laurentide Ice Sheet's Quebec-Labrador Dome
AuthorRice, JORCID logo; Ross, MORCID logo; Paulen, RORCID logo
SourceINQUA 2019 - 20th Congress of the International Union for Quaternary Research (INQUA), programme; 2019 p. 1 Open Access logo Open Access
LinksOnline - En ligne
Alt SeriesNatural Resources Canada, Contribution Series 20180368
PublisherInternational Union for Quaternary Research
MeetingINQUA 2019 - 20th Congress of the International Union for Quaternary Research (INQUA); Dublin; IE; July 25-31, 2019
DocumentWeb site
Mediaon-line; digital
RelatedThis publication is related to The Cabot Lake Ice Stream: a paleo-ice stream near the Ancestral Labrador Ice Divide of the Laurentide Ice Sheet's Quebec-Labrador dome
File formathtml; pdf (Adobe® Reader®)
ProvinceNewfoundland and Labrador; Quebec
NTS13L/11; 13L/12; 13L/13; 13L/14; 13M/03; 13M/04; 13M/05; 13M/06; 23I/09; 23I/10; 23I/15; 23I/16; 23P/02; 23P/07; 23P/08
AreaLabrador; Cabot Lake; Lac aux Goélands; Signal Hill
Lat/Long WENS -65.0000 -63.0000 55.5000 54.5000
Subjectssurficial geology/geomorphology; Nature and Environment; Science and Technology; glacial history; glaciation; deglaciation; ice flow; glacial deposits; glacial landforms; glacial features; glacial striations; lineations; sediment transport; sediment dispersal; Laurentide Ice Sheet; Cabot Lake Ice Stream; Ancestral Labrador Ice Divide; Quebec-Labrador Dome; Canadian Shield; Kogaluk River Ice Stream; Smallwood Ice Stream; De Pas Batholith; Happy Valley-Goose Bay Ice Stream; ice streams; ice-flow directions; Phanerozoic; Cenozoic; Quaternary
ProgramGEM2: Geo-mapping for Energy and Minerals Hudson/Ungava, Northeastern Quebec-Labrador, surficial geology
Released2019 07 01
AbstractThe Cabot Lake ice-stream (CLIS) is a previously unidentified east-trending ice-stream on the Canadian Shield that provides evidence for rapid basal-flow acceleration in close proximity to an ice-divide. The CLIS is located near the central-eastern border of Quebec and Newfoundland and Labrador, between two much larger ice-stream corridors. The CLIS is situated south of the Kogaluk River Ice-Stream near Strange Lake (IS #185 of Margold et al. 2015), and north of the unnamed ice-stream in the Smallwood Reservoir (herein referred to as the Smallwood ice-stream). The CLIS occupies a lowland region in the headwaters of the George River and is bounded on its onset zone and terminus by large bedrock upland regions: the Paleoproterozoic De Pas Batholith at its onset in the west and the Neoarchean granite and orthogneiss at its terminus in the east. The CLIS is 40 km wide at its onset, with a classic converging flow pattern and sharp lateral margins that narrows to 20 km wide near its terminus, where it abruptly ends at an intrusive bedrock upland region. The CLIS contains over 1000 streamlined landforms, many with elongation ratios of 12:1 or greater. The CLIS was relatively short-lived, given its extent, and following the ice streaming, the system shutdown with sluggish, topographically-controlled ice-flow to the northeast, which explains the high degree of preservation of the landforms and lack of a time-transgressive land system that would result from gradual glaciological changes. This younger northeastern ice-flow was oblique to the eastern-trending CLIS bedforms, as indicated by striations on nearby bedrock highlands and moderate reworking of some of the MSGLs.
This ice-stream operated near a migrating dispersal saddle of the Laurentide Ice Sheet's Quebec-Labrador dome in central-eastern Quebec. The CLIS' proximity to this ice-divide suggests that ice-streams were active toward the centre of the ice-sheet during late-stage deglaciation. The timing and duration of the ice-stream remain undefined; however, it shares a similar longitude to the Happy Valley-Goose Bay ice-stream to the south (IS #186 of Margold et al. 2015), another short ice-stream that is thought to have been active at about 8.9 cal ka BP. The location of the CLIS in such close proximity to an ice-divide, in conjunction with the other ice-streams operating simultaneously along the eastern margin of the retreating Laurentide Ice Sheet (e.g., Kogaluk River, Smallwood, and Happy Valley-Goose Bay ice-streams) indicate these ice-streams had an important impact on the transportation of glacial sediments away from core-regions of the ice dispersal-centre and possibly influenced the westward migration of the ice-divide during deglaciation.
Summary(Plain Language Summary, not published)
This is GEM-2 funded student PhD research being presented at an international conference, in a special session on ice streams.

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