CGRG Bibliography of Canadian Geomorphology
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Author : Charbonneau, R. ; and David, P.P.
Date : 1995.
Title : A shear-diffusion model of till genesis based on the dispersal pattern of indicator rocks in the Grand-Volume Till of central Gaspisie, Quebec, Canada
Publication : Boreas
Issue : 24(4):
Page(s) : 281-292
Abstract
Dispersal patterns of indicator rocks in central Gaspesie reveal that glacial debris is entrained in a basal debris-rich zone of shearing where clast diffusion takes place. The lithological composition of this till suggest that debris transport occurred by simple shear deformation of glacial debris. The intermixing of clasts at the intersection of two lithologically distinct dispersal trains of SSE and NE orientations, respectively, suggests that extensive mixing takes place during shearing. Physical interactions among the clasts lead to both upward and downward movements which cause the clasts to diffuse across the zone of shearing. This process of shear-diffusion results in continuous incorporation and mixing of the newly encountered rock types during glacial transport.
Bibliography of Canadian Geomorphology