Tectonic and magmatic features associated with the Mackenzie Large Igneous Province, including the rifting that created the Poseidon Ocean. Red star shows the initial Mackenzie plume zone relative to the lithosphere.
Mackenzie hotspot was a volcanic hotspot that existed about 1,267 million years ago across Canada from the Northwest Territories and Nunavut.
The Mackenzie hotspot is responsible for the creation of the
Mackenzie Large Igneous Province, which contains the largest dike swarm on Earth. During its formation, eruption of  plateau lavas near the Coppermine River, built an extensive volcanic plateau about 1,200 million years ago with an area of about 170,000 km 2 (66,000 sq mi) representing a volume of lavas of at least 500,000 km 3 (120,000 cu mi).
The Mackenzie hotspot also resulted in the opening of the
Mesoproterozoic Poseidon Ocean.
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