The Mackenzie dike swarm, also called the Mackenzie dikes, forms a large igneous province in the western Canadian Shield of Canada.
It is part of the larger Mackenzie Large Igneous Province and is one of more than three dozen dike swarms in various parts of the Canadian Shield.
The Mackenzie dike swarm is the largest dike swarm known on Earth,[1] more than 500 km (310 mi) wide and 3,000 km (1,900 mi) long, extending in a northwesterly direction across the whole of Canada from the Arctic to the Great Lakes.
About 1,268 million years ago, the Slave craton was partly uplifted and intruded by the giant Mackenzie dike swarm.
This was the last major event to affect the core of the Slave craton, although later on some younger mafic magmatism registered along its edges.