CGRG Bibliography of Canadian Geomorphology
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Author : Brent, T.A.; and Harrison, J.C.
Date : 1998
Title : Temperature conditions for ice-wedge cracking: field measurements from Salluit, Northern Québec
Publication : Permafrost, Seventh International Conference, June 23-27, Yellowknife, Canada. Edited by: A.G. Lewkowicz and M. Allard. Université Laval, Centre d'études nordiques, Collection Nordicana.
Issue : 57:
Page(s) : 83-88.
Abstract
Industry seismic profiles have been utilized to locate the base of ice-bonded permafrost (BIBP) throughout the Canadian Arctic Islands in porous Devonian through Tertiary bedrock to 1008 m below surface. Seismically-defined BIBP features, located at 160 to 480 milliseconds (ms), have been correlated with conventional BIBP as picked on petrophysical logs, and thermal profiles of studied exploration wells. Identifying seismic features include: 1) a continuous reflector from the base of permafrost ice that transects inclined stratal reflections; 2) amplitude decay of stratal reflectors at the BIBP; 3) bending of stratal reflectors that pass through the BIBP; 4) amplitude anomalies associated with a lithology and porosity dependent transitional BIBP and; 5) step-down of sub-permafrost reflectors that extend beyond the shoreline limit of permafrost. These data can provide an improved understanding of regional heat flow and porosity variation in bedrock, and insight into the growth and decay of the permafrost layer.
Bibliography of Canadian Geomorphology