Geologic map of the Muskox intrusion and adjacent geologic groups
The Muskox intrusion is a layered intrusion in Nunavut, Canada. It is located 144 km (89 mi) northeast of Great Bear Lake and 90 km (56 mi) 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 120 km (75 mi) and a thickness or original vertical dimension of over 6 km (3.7 mi). 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]
^Alexander R. McBirney, Igneous Petrology, Jones & Bartlett, 2006, 3rd ed., pp. 224 - 226 ISBN 0-7637-3448-9
^Gunter Faure, Origin of Igneous Rocks, Springer, 1st ed., 2000, pp. 357 - 358, ISBN 3-540-67772-0
The Muskoxintrusion is a layered intrusion in Nunavut, Canada. It is located 144 km (89 mi) northeast of Great Bear Lake and 90 km (56 mi) south of Kugluktuk...
Included in the Mackenzie Large Igneous Province are the large Muskox layered intrusion, the Coppermine River flood basalt sequence and the massive northwesterly...
intrusions that are primarily Precambrian in age. Prominent examples of lopoliths include the Bushveld Complex of South Africa, the Muskoxintrusion of...
Irvine TN (1977). "Origin of chromite layers in the Muskoxintrusion and other stratiform intrusions: a new perspective". Geology. 5 (5): 273. doi:10...
intrusions are tens of kilometers in size and almost all are Proterozoic in age, e.g. the Stillwater igneous complex (Montana), the Muskoxintrusion (Canada)...
magmatic event, that included the coeval, layered, mafic-ultramafic Muskoxintrusion and the enormous Mackenzie dike swarm that diverges from the Coppermine...
2007-09-21 "Muskox Property - The MuskoxIntrusion". Archived from the original on 2009-04-08. The 1.27 Ga Mackenzie Large Igneous Province and Muskox layered...
granites. A common occurrence of granophyre is within layered igneous intrusions dominated by rocks with compositions like that of gabbro. In such occurrences...
and with the Muskoxintrusion. Natkusiak flood basalts Volcanology of Canada Volcanology of Northern Canada Geological Report on the Muskox Property Archived...
magmatic event, that included the coeval, layered, mafic-ultramafic Muskoxintrusion and the enormous Mackenzie dike swarm that diverges from the Coppermine...
flood basalts, such as the Palisades Sill of New Jersey, US. The sheet intrusions (dikes and sills) beneath flood basalts are typically diabase that closely...
submerged for prolonged periods to evade predators or other unwelcome intrusions. This has also lent support to the idea that whales evolved from water-loving...
metamorphosed gabbro, diabase, and felsic dikes and sills and granite intrusions. Overlying the Precambrian strata are up to 2.25 km (7,400 ft) of Upper...
explorer Heinrich Barth, in his works of 1857, cites firearms and European intrusion among the reasons for the decrease in its numbers. It was extinct in Tunisia...
between 127 and 129 million years ago was characterized by the widespread intrusion of sills and dikes. Flood basalt volcanism during the second time interval...
Ellesmere Island were small bands of Inuit drawn to the area for Peary caribou, muskox, and marine mammal hunting about 1000–2000 BC. Axel Heiberg Island is one...
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