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TitleBasal debris entrainment and transport in glaciers of southwestern Bylot Island, Arctic Canada
AuthorZdanowicz, C M; Michel, F A; Shilts, W W
SourceAnnals of Glaciology vol. 22, 1996 p. 107-113, (Open Access)
Alt SeriesEarth Sciences Sector, Contribution Series 20060266
PublisherCambridge University Press (CUP)
Mediapaper; on-line; digital
File formatpdf
NTS38B/13; 38B/14; 38C/03; 38C/04
AreaBylot Island; Canadian Arctic; Arctic Islands
Lat/Long WENS-80.0000 -78.0000 73.2500 72.7500
Subjectssurficial geology/geomorphology; ice; glacial deposits, ice-pressed; ice movement; ice retreat; ice transport directions; icefields; ice flow; ice movement directions; Holocene; glaciers; glacial deposits; glacier surveys; isotopes; oxygen isotopes; Quaternary; Cenozoic
Illustrationsplots; profiles; transects; sketch maps
Released2017 01 20
AbstractGlaciers on southwestern Bylot Island in the Canadian Arctic flow from an alpine setting in high-grade crystalline Archean terrane, on to coastal lowlands underlain by clastic sedimentary strata of Cretaceous to Tertiary age. We have used the contrasting mineralogy of the substrate as a tool to study subglacial entrainment and transport of debris in two large piedmont glaciers on Bylot Island. High chlorite/ and mica-illite/smectite ratios indicate that most basal debris is derived from crystalline rocks underlying the upper reaches of the glaciers. The subglacial accretion of Cretaceous-Tertiary sediments appears restricted to the lowermost part of the basal zone and is most noticeable near the glaciers- termini. Ice associated with discrete silly-sandy debris layers is characterized by an isotopic signature indicative of refreezing of meltwater at the glacier sole. The compositional, textural and isotopic characteristics of basal sediment and ice lead us to conclude that subglacial entrainment through basal ice accretion occurs in both the upper and marginal parts of the glaciers.

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