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Abstract

The Ni-Cu ores of the Sudbury district are associated with the Sudbury Igneous Complex (SIC), a layered intrusion ranging from quartz norite at the base, through gabbro to a granophyric cap. The purpose of this section is to describe the geological setting at Sudbury, show the extent to which contamination by crustal rocks has modified the composition of the Complex, and how this can account for the profusion of concentrations of magmatic sulfide ore deposits. The chapter draws very heavily on articles by Naldrett et al. (1986a, b).

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