CGRG Bibliography of Canadian Geomorphology
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Author : Fahey, B.D.; and Dagesse, D.F.
Date : 1984.
Title : An experimental study of the effect of humidity and temperature variations on the granular disintegration of argillaceous carbonate rocks in cold climates
Publication : Arctic and Alpine Research
Issue : 16(3):
Page(s) : 291-298
Abstract
This study evaluates the potential for temperature-related humidity changes and associated adsorption to cause particle size reduction of prepared aggregates of fine-grained carbonate-rich sedimentary rocks under simulated periglacial conditions. Replicate samples in the 16- to 2-mm size range of two shales, a dolomite, and a limestone were subjected to humidity cycles above and below freezing, and to freeze-thaw. Samples classified as sorption sensitive yielded as much material to the <2-mm size grades after 200 above-freezing humidity cycles as did frost sensitive samples subjected to the same number of across-freezing cycles. The response of the sorption-sensitive samples to the below-freezing cycles was similar but more subdued. In virtually all cases the above- and below-freezing cycles released more silt and clay in proportion to the <2-mm totals, compared with the across-freezing cycles. Stresses generated by adsorption inargillaceous carbonates may be just as significant as microgelivation in the production of fine material from regolith in periglacial environments
Bibliography of Canadian Geomorphology