CGRG Bibliography of Canadian Geomorphology
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Author : Brennand, T.A.; and Shaw, J.
Date : 1996.
Title : The Harricana glaciofluvial complex, Abitibi region, Quebec: its genesis and implications for meltwater regime and ice-sheet dynamics.
Publication : Sedimentary Geology
Issue : 102(3-4):
Page(s) : 221-262.
Abstract
Interlobate moraines have been defined by their relationship to adjacent landforms and sediments, with minimal reference to any genesis suggested from their own geomorphology and sedimentology. A case in point is the "Harricana interlobate moraine". The Harricana complex, a relatively continuous, linear accumulation of glaciofluvial sediments, is investigated in terms of its geomorphology, sedimentology, stratigraphic context, and landform associations for the portion between latitudes 48degree N and 50 degree N. The origin of the Harricana complex as a mainly synchronous subglacial landform is linked to formation of adjacent streamlined bedforms and bedrock erosional marks by meltwater outburst floods. The complex is located where the orientation of these subglacial bedforms indicate strong flow convergence. Post-flood, ice sheet collapse along this convergence zone initiated redirection of ice flow, resulting in cross-cutting striae. Later subglacial meltwater systems followed new hydraulic gradients toward this trough of thinner ice, forming a major conduit and depositing the Harricana glaciofluvial complex.
Bibliography of Canadian Geomorphology