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TitleSensitivity of bedrock to acid precipitation: modification by glacial processes
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorShilts, W W
SourceGeological Survey of Canada, Paper 81-14, 1981, 7 pages (3 sheets), (Open Access)
MapsPublication contains 3 maps
Map Info.geological, 1:1,000,000
Mediapaper; on-line; digital
RelatedThis publication contains the following publications
File formatpdf
ProvinceNova Scotia; New Brunswick; Quebec; Ontario; Manitoba; Newfoundland and Labrador
NTS1; 2; 10; 11; 12; 21; 22; 20; 30; 31; 32; 40; 41; 42; 52
Lat/Long WENS-96.0000 -52.0000 52.0000 41.5000
Subjectssurficial geology/geomorphology; environmental geology; glaciers; acid rain
Released1981 06 01; 2014 04 07
AbstractIn Canada, the simple relationship of soils to underlying bedrock has been distorted by glaciers which have transported debris from one type of bedrock onto areas where the rock may have a different composition. For example, on the Canadian Shield north of Lake Superior, continental glaciers have spread a sheet of glacial deposits, rich in calcium carbonate, onto granitoid rocks over an area extending hundreds of kilometres west and south of the limestone basin of Hudson Bay. These limestone-rich glacial deposits have imparted significant buffering capacity to terrain that, in the absence of glaciation, would have produced quartz-rich so ils with high sensitivity to acid precipitation. Similar situations exist elsewhere in southeastern Canada. Acid precipitation, by lowering the pH of glacial soils or of surf ace waters, also may mobilize potentially noxious chemical elements that under natural conditions are stable in the soil or in lakes or streams.

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