Abstract
This paper includes Sudbury breccias not previously examined in detail; particular emphasis is placed on the relations between Sudbury breccias and the Onaping volcanics and nickel irruptive. Comparison is made with breccias described elsewhere and particularly with the very similar pseudotachylite which is abundant around the upthrust granite core of the Vredefort dome, South Africa. In post-Huronian time the central core of a large dome structure is believed to have been thrust upward, and explosive volcanoes developed at its apex. The volcanic center then collapsed, to form the great caldera now known as the Sudbury Basin. The stretching of the crust resulted in the formation of multitudes of tension fissures; earth movements related to the upthrust, explosive volcanism, and collapse of the structure caused crush breccias to form in the tension fractures. Fluids related to the volcanism passed through the breccia zones and may have assisted in the formation or modification of the breccias.
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