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On a map showing only metamorphic rocks, the Canadian Shield forms a circular pattern north of the Great Lakes around Hudson Bay.. The Canadian Shield is a large area of Archean through Proterozoic igneous and metamorphic rocks in eastern Canada and north central and northeastern United States.
Many of Canada's major ore deposits are associated with greenstone belts. [ 15 ] The Sturgeon Lake Caldera in Kenora District , Ontario, is one of the world's best preserved mineralized Neoarchean caldera complexes, which is 2.7 Ga. [ 16 ] The Canadian Shield also contains the Mackenzie dike swarm , which is the largest dike swarm known on ...
Map of the Mackenzie dike swarm. The Mackenzie dike swarm, also called the Mackenzie dikes, forms a large igneous province in the western Canadian Shield of Canada.It is part of the larger Mackenzie Large Igneous Province and is one of more than three dozen dike swarms in various parts of the Canadian Shield.
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Tectonic and magmatic features associated with the Mackenzie Large Igneous Province. Red star shows the initial Mackenzie plume zone relative to the lithosphere; partial black circle is the estimate of the zone of plume influence on stress-field orientation; dark lines are dikes of the Mackenzie swarm; CRB indicates the Coppermine River basalts; M indicates the Muskox intrusion.
Canada's mineral resources are diverse and extensive. [1] Across the Canadian Shield and in the north there are large iron, nickel, zinc, copper, gold, lead, molybdenum, and uranium reserves. Large diamond concentrations have been recently developed in the Arctic, [2] making Canada one of the world's largest producers. Throughout the Shield ...
Map of the Matachewan and Mistassini dike swarms of Eastern Canada The Matachewan dike swarm is a large 2,500 to 2,450 million year old Paleoproterozoic dike swarm of Northern Ontario , Canada . It consists of basaltic dikes that were intruded in greenschist , granite -greenstone, and metamorphosed sedimentary terrains of the Superior Craton of ...
In 1992, Coffin and Eldholm initially defined the term "large igneous province" as representing a variety of mafic igneous provinces with areal extent greater than 100,000 km 2 that represented "massive crustal emplacements of predominantly mafic (magnesium- and iron-rich) extrusive and intrusive rock, and originated via processes other than 'normal' seafloor spreading."