CGRG Bibliography of Canadian Geomorphology
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Author : Ford, D.C.
Date : 1997
Title : Principal features of evaporite karst in Canada.
Publication : Carbonates and Evaporites
Issue : 12(1):
Page(s) : 15-23.
Abstract
Types of karst that occur are determined chiefly by relations between (i) formation thickness and purity, (ii) regional topography and hydraulic gradient, (iii) effects of receding Wisconsinan and earlier glaciers, and (iv) extent of modern permafrost. Exposures of bare karst on thick, pure sulfate formations are comparatively rare. Two principal landform types found are them are: 1) high-density polygonal karst, where hydraulic gradients are high and tills are thin; 2) hills and ridges of blocks uplifted and fractured by tectonics at paleo-icefront positions where hydraulic gradients are low. Deeply till-mantled karst dominated by collapse and suffosion sinkholes in the mantling detritus is well developed in southwestern Newfoundland and in central and northern Nova Scotia. Covered karst is abundant on sulfates conformably overlain by carbonate or clastic strata; collapse sinkholes are the principal landform. Large breccia pipes are associated with deep subrosion of salt during glacier recessions. Syngenetic breccia karst is a fourth, distinct category created in some formations of thin, interbedded dolostones and sulfates.
Bibliography of Canadian Geomorphology