CGRG Bibliography of Canadian Geomorphology
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Author : Clarhall, A.; and Jansson, K.N.
Date : 2002.
Title : Glacial flow chronology at Lac Aux Goelands, north-eastern Quebec.
Publication : Glacial Erosion Zonation - Perspectives on Topography, Landforms, Processes and Time. By: Anders Clarhall. Doctoral Dissertation. Department of Physical Geography and Quaternary Geology, Stockholm University.
Issue : Part V.
Page(s) : 1-13.
Abstract
We used airphoto-based mapping and field-investigations around Lac Aux Geoelands (Whitegull Lake) in northeastern Quebec and established a glacial flow chronology that involves three different glacial landforms systems, the youngest of which we interpret as related to the late Wisconsinan deglaciation. The system has an up-glacier discontinuity that marks a temporal shift to non-erosive cold-based conditions, whereby older glacial landscapes are preserved in the interior of Quebec-Labrador. Furthermore, results support a northward migrating ice divide to a final position south of Ungava bay during a late deglaciation stage. The recognition that a glacial landscape is fragmented and consists of smaller, unrelated units is of considerable significance in understanding ice sheet dynamics and patterns of subglacial preservation and deglaciation. This is because a fragmented landscape implies a fragmented formation history, where formation of subglacial landforms occurred in restricted subglacial zones under restricted time periods. Periods of formation must have been separated by periods of preservation and inhibited subglacial reshaping. Based on ice margin retreat velocity and erosion magnitude estimates, we suggest that periods of preservation were orders of magnitude longer than periods of subglacial landform formation.
Bibliography of Canadian Geomorphology