Canadian Shield


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Canadian Shield

or

Laurentian Plateau

(lôrĕn`chən), U-shaped region of ancient rock, the nucleus of North America, stretching N from the Great Lakes to the Arctic Ocean. Covering more than half of Canada, it also includes most of Greenland and extends into the United States as the Adirondack Mts. and the Superior Highlands. The first part of North America to be permanently elevated above sea level, it has remained almost wholly untouched by successive encroachments of the sea upon the continent. It is the earth's greatest area of exposed Archaean-age rock; the metamorphic rocks of which it is largely composed were probably formed in the Precambrian. Repeatedly uplifted and eroded, it is today an area of low relief (c.1,000–2,000 ft/305–610 m above sea level) with a few monadnocks and low mountain ranges (including the Torngat and Laurentian Mts.) probably eroded from the plateau during the Cenozoic era. During the Pleistocene epoch, continental ice sheets depressed the land surface (see Hudson BayHudson Bay,
inland sea of North America, c.475,000 sq mi (1,230,000 sq km), c.850 mi (1,370 km) long and c.650 mi (1,050 km) wide, E central Canada. Hudson Bay and James Bay (its southern extension) and all their islands border Nunavut Territory, Manitoba, Ontario, and Quebec.
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), scooped out thousands of lake basins, and carried away much of the region's soil. Drainage is generally very poor on the shield. The southern part of the shield has thick forests while the north is covered with tundra. The region is largely undeveloped but has great water-power potential and is a source of minerals, timber, and fur-bearing animals.

Canadian Shield

[kə′nād·ē·ən ′shēld]
(geology)

Canadian Shield

(in Canada) the wide area of Precambrian rock extending west from the Labrador coast to the basin of the Mackenzie and north from the Great Lakes to Hudson Bay and the Arctic: rich in minerals
References in periodicals archive ?
As for a waste site in Canadian Shield granite, any leakage would flow into active streams and marshlands "Hence, the volumes of the bodies of water available for dilution at the surface are either immense (Great Lakes) or actively flowing ...
In contrast to the thermogenic isotopic distribution pattern shown in Figure 1, a series of Canadian Shield hydrocarbon gases recently studied at Kidd Creek Mine, Timmins, ON show a significant depletion in [C.sup.13] for [C.sub.2]-[C.sub.4] with respect to [C.sub.1] (4).
From sounds of the imagined beaver rut, Reaching North surefootedly travels to many other places on the Canadian Shield around Yellowknife, finishing deep inside the earth's crust via the McDonald Fault that creates the East Arm of Great Slave Lake.
In-Fisherman Field Editor Gord Pyzer thinks nothing beats topwater action for his Canadian Shield bass in July.
Most of the province is Canadian Shield, with deep lakes better known for outstanding fishing.
The province's rich mineral endowment can be largely attributed to the vastness of its land surface (~1.5 x 106 [km.sup.2]), 90% of which is underlain by Precambrian rocks of the Canadian Shield. The presence of several world-class metal deposits, such as Lac Tio (Fe-Ti), Mont Wright (Fe), Doyon and Sigma-Lamaque (Au), LaRonde (Au-CuZn), Niobec (Nb), Raglan (Ni-Cu-PGE), Horne (Cu-Au), and Jeffrey (chrysotile, asbestos), attests to Quebec's vast and diverse mineral resource base.
The concept proposed by AECL is to dispose of nuclear fuel waste deep underground in the rock of the Canadian Shield [ILLUSTRATION FOR FIGURE 1 OMITTED].
Georgian Bay Islands National Park (NP) is an incredible map of islands located on the edge of the Canadian Shield. This national park is renowned for the variety of reptiles and amphibians they support, where the windswept white pines and granite shores of the Canadian Shield turn to dense deciduous woodland.
There's still time for a trip for lake trout on Canadian Shield waters and the mountain waters of the West.
"They know they live in a relatively small geographical area with a history of earthquakes as large as six on the Richter scale; they know our population is only 750,000, but it is well spread out, unlike the very sparsely populated areas of the more stable Canadian Shield in Saskatchewan and Ontario.
and Roberts, B.J., 1999, Frozen subduction in Canada's Northwest Territories; Lithoprobe deep lithospheric reflection profiling of the western Canadian Shield: Tectonics, v.
The hospital intake area covers the region from the northern boundary of Ontario's Canadian Shield to the Hudson Bay low-land.

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