The Grenville dike swarm is a large Proterozoic dike swarm in the Canadian provinces of Ontario and Quebec. It is one of the several major magmatic events in the Canadian Shield and it possibly formed 590 million years ago along a triple junction that might have been related to a mantle plume.Geochemistry of the Grenville Dyke Swarm: role of plume-source mantle in magma genesis The maximum length of the Grenville dike swarm is .Basement tectonics 7: Proceedings of the Seventh International Conference on Basement Tectonics held in Kingston, Ontario, Canada, August 1987
The Ottawa-Bonnechere Graben is associated with the Grenville dike swarm, as some of its features date from that time.
See also Volcanism of Canada Volcanism of Eastern Canada Grenville orogeny
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