Using lithogeochemical data and immobile element relationships, specific volcanic units can be identified and traced. The upper plot shows highly altered volcanic rocks at the Phelps Dodge deposit, in the Matagami area, which were all derived from one homogeneous unit. The magmatic affinity of a series of volcanic rocks can also be determined, as in the lower plot, where the Ansil mafic to felsic volcanic rocks, in the Noranda area, are of transitional affinity.

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