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Lake Geochemistry in the Kaminak Lake Area, District of Keewatin ,
N.W.T
Klassen, RA | Nichol, I | Shilts, WW
Verhandlungen, Internationale Vereinigung fuer Theoretische und
Angewandte Limnologie Vol. 19, p 340-348, October 1975. 5 fig, 3
tab, 14 ref.
Geochemical sampling of five large, temperate, dimictic lakes in
the Kaminak Lake area, Keewatin District (N.W.T., Canada) showed
characteristics that differed from lakes in western and southern
parts of the Canadian Shield. These characteristics included: (1)
greater depth and thoroughness of water circulation; (2) high
summertime oxygenation of both water and sediments; (3) high
conductivity (180-360 micro-mho/cm) reflecting high dissolved
solids; (4) very low organic carbon levels in the sediment
(<1-27%; generally <6%); and (5) iron and manganese precipitate
bands at and below the sediment-water interface. Trace metal
levels, controlled mainly by organic carbon content, did not
obviously reflect mineralized sources in the -210 micrometer
fraction. The research is part of a larger study of relationships
among bedrock, overburden, sediment, and water composition to
assess factors affecting metal dispersion in lake sediments. A
basis was needed for evaluating the potential lake sediment
geochemistry in reconnaissance exploration; massive copper-zinc
and copper-nickel sulfide occurrences are thought to have economic
potential. The area is underlain by continuous permafrost 15-200
cm beneath the surface. Mean monthly air temperatures range from
+15 to -30C. Water pH was 6.9-7.6 at the surface and 5.9-7.4 at
the bottom. Dissolved oxygen at the surface was at or near
saturation (9-10 ppm); absolute levels increase with depth and
decreasing temperatures. (Lynch-Wisconsin)
 Descriptors: Kaminak Lake(N.W.T. | Canada) | Geochemistry | Sediments | Lakes | Metals | Canada | Bedrock | Circulation | Sediment-water interfaces | Keewatin District(N.W.T. Canada) | Permafrost | Trace elements | Canadian Shield | Dissolved oxygen | Conductivity | Dispersion
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