Abstracts
Summary
Within the Grenville Province of Southeastern Ontario geological data may be interpreted in the light of plate tectonic theory. An early cycle involving subduction of oceanic lithosphère, generation of an island arc complex together with partial melting of the down-going slab to produce calc-alkalic volcanism and granodioritic intrusions, was followed by a second cycle during which the island arc was uplifted, eroded and covered by miogeoclinal sediments. Subsequently the miogeocline was deformed presumably during continental collision. The evolution from early island arc phase to ocean closure and consolidation took approximately 250 m.y.
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