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TitleStreamlined and lobate landforms, relating to successive ice flows in the Smallwood Reservoir, northern Labrador
AuthorPaulen, R C; Rice, J M; McClenaghan, B
SourceJoint Assembly 2015 - AGU-GAC-MAC-CGU, Montreal, Canada: abstract listing; Geological Association of Canada-Mineralogical Association of Canada, Joint Annual Meeting, Abstracts Volume vol. 38, 2015 p. 138-139
Year2015
Alt SeriesEarth Sciences Sector, Contribution Series 20140488
PublisherGeological Association of Canada
MeetingJoint Assembly 2015: Geological Association of Canada, Mineralogical Association of Canada, American Geophysical Union, Canadian Geophysical Union; Montreal; CA; May 3-7, 2015
Documentserial
Lang.English
Mediapaper; on-line; digital
File formatpdf
ProvinceNewfoundland and Labrador
NTS23I/01; 23I/02; 23I/07; 23I/08
AreaSmallwood Reservoir; Labrador
Lat/Long WENS -65.0000 -64.0000 54.5000 54.0000
Subjectssurficial geology/geomorphology; ice flow; glaciation; glacial landforms; ice sheets; glacial deposits; eskers; drumlins; bedrock geology
Illustrationsphotographs
ProgramHudson/Ungava, Northeastern Quebec-Labrador, surficial geology, GEM2: Geo-mapping for Energy and Minerals
LinksOnline - En ligne (complete volume, 10.7 MB)
AbstractReconstruction of past ice-flow trajectories, their associated landforms and glacial landsystems are fundamental for successful application of drift prospecting as it provides information on dispersal characteristics of former Pleistocene ice sheets. The sequence of striation trends provides a complete chronology of ice-flow events, which is inscribed on many outcrops of the Smallwood Reservoir in Labrador, including the oldest documented ice flow to the northeast which originated in the Quebec Highlands. Local glacial landforms, however, do not reflect this oldest ice flow event. Lobate or reoriented landforms, with two principal axes parallel to later phase ice movements, occur within the Smallwood Reservoir. These lobate landforms have a multi-phase origin. The first and major landform-forming ice-flow phase was southeastward from ice flowing radially from the Hudson Ice Centre in northern Quebec. Nucleation of drumlin and other streamlined landform formation may have been pre-existing glacial sediments or bedrock outcrops. A subsequent eastward ice-flow remobilized the previously deposited tills and created elongated landforms with high length to width ratios, possibly indicative of fast flowing ice that surged to the Labrador coast. Esker systems in the region are also trend with this late eastward flow. Studies are ongoing to correlate the glacial record with till provenance, as part of the Geological Survey of Canada's GEM2 Hudson-Ungava Project.
Summary(Plain Language Summary, not published)
A presentation for a special session on glacial landforms and ice streams at the 2015 GAC meeting in Montreal. This presentation will highlight observations from the 2014 GEM2 Hudson-Ungava Surficial field season with respect to landforms and measured striations in the Smallwood Reservoir. The intent is to open discussions regarding the model for glacial history in the region, and how to benefit future exploration.
GEOSCAN ID296010