CGRG Bibliography of Canadian Geomorphology
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Author : De Angelis, H.; and Kleman, J.
Date : 2004.
Title : Paleo-ice stream map of northern Keewatin and Boothia peninsula region, Nunavut, Canada.
Publication : Association Québécoise pour l'Étude du Quaternaire (AQQUA) et Canadian Geomorphology Research Group (CGRG). 14-15-16 mai 2004, Université Laval, Québéc.
Issue :
Page(s) : 59.
Abstract
Widespread geomorphological evidence supporting the existence of narrow bands of fast ice flow, i.e. ice streams, is known over a wide part of the area formerly covered by the Laurentide Ice Sheet. Though several studies have shown that these ice-streams played an important role in the dynamics of the ice-sheet, detailed paleo-ice stream maps for some parts of the ice-sheet are still lacking. In the region of northern Keewatin and Boothia peninsulas, Nunavut, Canada, several paleo-ice streams have been reported but detailed mapping is not yet available. Better knowledge of the basic characteristics and timing of these ice-streams is important in order to understand the dynamics and evolution of the northernmost reaches of the Laurentide Ice Sheet. Based on the interpretation of Landsat 7 Enhanced Thematic Mapper Plus data we produced a paleo-ice stream map of this region. A total of 53 scenes were used, covering 1.27 x 106 km2 of northern Keewatin and Boothia peninsulas. Mapping of relevant landforms, i.e. till lineations, eskers and moraine ridges, was performed at full resolution on individual images by using a Geographic Information System approach. Results were exported and integrated into a map covering the whole region and containing a 1-Km Digital Elevation Model and a mosaic compiled with resampled Landsat 7 imagery. Interpretation was carried out through the integration of mapped features into landform assemblages, i.e. geomorphic fans, with glaciological significance. At some locations, age relationships for these fans were suggested by existing cross-cutting relationships. Absolute ages were constrained by published dates, when available. The final result is a paleo-ice stream map covering a poorly constrained area of the northern Laurentide Ice Sheet and suitable for paleoglaciological studies.
Bibliography of Canadian Geomorphology