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Session 3 — Catastrophism and the development of mineral resources

The Sudbury Igneous Complex (SIC) is a 1·85 Ga remnant impact melt sheet1 located within Archaean and Proterozoic target rocks north-west of the town of Sudbury, in northern Ontario, Canada. The SIC is an elliptical 60 x 30 km, 2·5 km thick, differentiated melt sheet of a proposed ~250 km diameter impact structure. At the time of emplacement the SIC is believed to have been superheated to ~2000°C and taken up to 2 Ma to cool.3 The metamorphic aureole of the SIC has been mapped in the North Range of the Sudbury Structure, in Archaean rocks composed mainly of Levack Gneiss and Cartier Granitoid.