| Title | Glacial landform-sediment assemblages in the Canadian High Arctic and their implications for Late Quaternary glaciation |
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| Author | Ó Cofaigh, C; Lemmen, D S; Evans, D J A; Bednarski, J |
| Source | Papers from the International Symposium on Glaciers and the Glaciated Landscape; Annals of Glaciology vol. 28, 1999 p. 195-201, https://doi.org/10.3189/172756499781821760  Open
Access |
| Year | 1999 |
| Alt Series | Geological Survey of Canada, Contribution Series 1998168 |
| Alt Series | Polar Continental Shelf Project, Contribution 004098 |
| Publisher | Cambridge University Press (CUP) |
| Meeting | International Symposium on Glaciers and the Glaciated Landscape; Kiruna; SE; August 17-20, 1998 |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf |
| Province | Nunavut |
| NTS | 39B/04; 39B/05; 39B/11; 39B/12; 39B/13; 39B/14; 39C/04; 39C/05; 39C/06; 39C/11; 39C/12; 39C/13; 39C/14; 39E/05; 39E/06; 39E/08; 39E/09; 39E/11; 39F; 39G; 39H; 48E/09; 48E/10; 48E/11; 48E/12; 48E/13; 48E/14;
48E/15; 48E/16; 48F/09; 48F/10; 48F/11; 48F/12; 48F/13; 48F/14; 48F/15; 48F/16; 48G; 48H; 49; 58E/09; 58E/10; 58E/11; 58E/12; 58E/13; 58E/14; 58E/15; 58E/16; 58F/12; 58F/13; 58F/14; 58F/15; 58G; 58H; 59; 68H/01; 68H/02; 68H/07; 68H/08; 68H/09;
68H/10; 68H/15; 68H/16; 69A/01; 69A/02; 69A/07; 69A/08; 69A/09; 69A/10; 69A/15; 69A/16; 69D/01; 69D/02; 69D/07; 69D/08; 69D/09; 69D/10; 69D/15; 69D/16; 69E/01; 69E/02; 69E/07; 69E/08; 69E/09; 69E/10; 69E/15; 69E/16; 69H/16; 120; 340; 560 |
| Area | Ellesmere Island; Devon Island; Axel Heiberg Island; Greenland; Denmark |
| Lat/Long WENS | -98.0000 -56.0000 84.0000 74.5000 |
| Subjects | surficial geology/geomorphology; glaciers; glacial tectonics; deglaciation; meltwater channels; erratics trains; glacial striations; glaciomarine deposits; ice margins |
| Illustrations | location maps; photographs; tables |
| Program | NSERC Natural Sciences and Engineering Research Council of
Canada |
| Program | University of Alberta,
Canadian Circumpolar Institute, Northern Research Grants |
| Released | 2017 09 14 |
| Abstract | Modern terrestrial glaciers in the Canadian High Arctic range from polythermal to cold-based. Where polythermal glaciers override thick unconsolidated sediment, longitudinal compression and
glaciotectonic thrusting produce thrust-block moraines. In contrast, the dominant geomorphic record of cold-based glaciers consists of lateral and proglacial meltwater channels. Geomorphic and sedimentary evidence indicates that late Quaternary fiord
glaciers were also characterized by variations in basal thermal regime. Erratic dispersal trains and striated bedrock record the flow of warm-based ice during the Last Glacial Maximum. Emergent grounding-line fans and morainal banks, deposited during
deglaciation, consist of heterogeneous glaciomarine deposits that record well-developed subglacial drainage and high sedimentation rates. However, in other fiords, subaqueous outwash and fine-grained glaciomarine deposits are absent and deglaciation
is recorded by lateral meltwater channels graded to raised glaciomarine deltas, suggesting these glaciers were predominantly cold-based during retreat. Regionally, deglacial depocentres are located at pinning points within fiords and a prominent belt
of glaciogenic landforms at fiord heads records stabilization of ice margins during early Holocene retreat, rather than the limit of late Quaternary glaciation. Collectively, these observations refute previous reconstructions which inferred a
climatically controlled switch from cold- to warm-based thermal conditions in fiord glaciers during early Holocene deglaciation, and indicate that the dominant controls on thermal regime were glaciological. |
| GEOSCAN ID | 209848 |
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