Muskox intrusion
The Muskox intrusion is a layered intrusion in Nunavut, Canada. It is located Script error: No such module "convert". northeast of Great Bear Lake and Script error: No such module "convert". south of Kugluktuk on Coronation Gulf. It was formed during a large magmatic event during the Proterozoic by hotspot or mantle plume volcanism that emplaced the widespread Coppermine River Group flood basalts.
The intrusion is a tilted trough shaped body with an exposed length of Script error: No such module "convert". and a thickness or original vertical dimension of over Script error: No such module "convert".. Rock types include picrite, peridotite, dunite, pyroxenite, gabbro and granophyre. A feeder dike of olivine gabbro is exposed "below" the now tilted sequence.[1]
Potassium argon dating in the region provides an age of 1095 - 1155 Ma for the Muskox intrusion, 1100 - 1200 Ma for the Mackenzie dike swarm and 740 - 1200 Ma for the Coppermine basalt flows (younger dates are interpreted as having been reset by later intrusion of gabbro sills at 604 - 718 Ma). Further stratigraphic and structural evidence provides further support that the Muskox, the MacKenzie dikes and the Coppermine flows are of the same magmatic event that formed the Mackenzie Large Igneous Province and the Muskox is interpreted as occupying the magma chamber which fed the volcanism.[2]
See also
References
<templatestyles src="Reflist/styles.css" />
- ↑ Alexander R. McBirney, Igneous Petrology, Jones & Bartlett, 2006, 3rd ed., pp. 224 - 226 Template:ISBN
- ↑ Gunter Faure, Origin of Igneous Rocks, Springer, 1st ed., 2000, pp. 357 - 358, Template:ISBN
Script error: No such module "Check for unknown parameters".
Script error: No such module "Authority control". Script error: No such module "Coordinates".