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Abstract

Periodically during the earth's history, large-scale rifting of the crust has developed across and within many continents. In some cases this has reached the stage of complete rupture, to produce two separate plates; in others the rifting has been less extreme and the magmas have intruded into and extruded on continental crust. Interaction between the magmas and the crust has given rise to Ni-Cu sulfide ores which form the subject of this chapter. Two very important nickel camps have formed in this way: the Lower Triassic ores of the Noril'sk-Talnakh camp, Siberia; and the 1.1 Ga ores of the Duluth Complex, Minnesota.

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