Map of the Mackenzie Large Igneous Province and its sub-features. The Coppermine River Group are shown as "Coppermine River volcanics".
Eruptive historyedit
The Coppermine River Group was formed when vast volumes of basalticlava paved over a large area of the northwestern Canadian Shield about 1,267 million years ago. These basalts form flood basalts that reach thicknesses ranging from 2,000 m (6,562 ft) to 3,500 m (11,483 ft) and consists of about 150 lava flows, each about 10–25 m thick. Except for the lowermost flows, which contain evidence of interaction with water, the entire sequence was erupted subaerially. 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 km2 (65,637 sq mi) representing a volume of lavas of at least 500,000 km3 (119,956 cu mi). These flood basalts have been interpreted as contemporaneous with the giant Mackenzie dike swarm and with the Muskox intrusion.[2]
^Geological Report on the Muskox Property 2011-07-15 at the Wayback Machine
^Gunter Faure, Origin of Igneous Rocks, Springer, 1st ed., 2000, pp. 357 - 358, ISBN3-540-67772-0
December 20, 2023
coppermine, river, group, sequence, mesoproterozoic, continental, flood, basalts, forming, part, mackenzie, large, igneous, province, northwest, territories, nunavut, canada, among, largest, flood, basalt, provinces, earth, covering, area, with, volume, approx. The Coppermine River Group is a sequence of Mesoproterozoic continental flood basalts forming part of the Mackenzie Large Igneous Province in the Northwest Territories and Nunavut Canada It is among the largest flood basalt provinces on Earth covering the area with a volume of approximately 650 000 km3 155 943 cu mi 1 Map of the Mackenzie Large Igneous Province and its sub features The Coppermine River Group are shown as Coppermine River volcanics Eruptive history editThe Coppermine River Group was formed when vast volumes of basaltic lava paved over a large area of the northwestern Canadian Shield about 1 267 million years ago These basalts form flood basalts that reach thicknesses ranging from 2 000 m 6 562 ft to 3 500 m 11 483 ft and consists of about 150 lava flows each about 10 25 m thick Except for the lowermost flows which contain evidence of interaction with water the entire sequence was erupted subaerially 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 km2 65 637 sq mi representing a volume of lavas of at least 500 000 km3 119 956 cu mi These flood basalts have been interpreted as contemporaneous with the giant Mackenzie dike swarm and with the Muskox intrusion 2 See also editNatkusiak flood basalts Volcanology of Canada Volcanology of Northern CanadaReferences edit Geological Report on the Muskox Property Archived 2011 07 15 at the Wayback Machine Gunter Faure Origin of Igneous Rocks Springer 1st ed 2000 pp 357 358 ISBN 3 540 67772 0 Retrieved from https en wikipedia org w index php title Coppermine River Group amp oldid 1053942029, wikipedia, wiki, book, books, library,
