Rainbow Range (Coast Mountains)
image_caption=Rainbow Range colours from heavy mineralization
Coast Mountains/ Chilcotin Plateau
period=8 million years (
map_caption=The Rainbow Range is a
mountain rangein British Columbia, Canada, located km to mi|40|spell=Commonwealth northwest of Anahim Lake. It is on the western edge of the Chilcotin Plateau, adjoining the Pacific Rangesof the Coast Mountainsto the south, and the Kitimat Rangesof the Coast Mountains to the north. In some classification systems it is considered part of the Coast Mountains and has been assigned here in Wikipedia to the Pacific Ranges although it is not formally part of that range-complex.
It lies north of the Bella Coola and
Atnarko Rivers and south and west of the Dean River, which curves around its north flank, and is relatively drier in climate and easier of terrain than more mountainous areas immediately west.
The Rainbow Range is an eight million year old (
Miocene) massive peralkaline shield volcanoin the Anahim Volcanic Beltwhich includes the lower but similar Itcha and Ilgachuz Ranges. The shield has a diameter of Unit km|30|0 is now heavily eroded by glaciers carving into the volcanic rockand sands over millions of years. The volcanism that created the shield is not well studied and is poorly understood. It is thought to be the result of the North American Platepassing over a hotspot, similar to the one feeding the Hawaiian Islands, known as the Anahim hotspot. Its main summit is the volcanic coneof Tsitsutl Peakconvert|2495|m|ft|0|abbr=on and the only real separate volcanic peak associated with the Rainbow Range is Anahim Peakwhich sits on its northeast flank. Other peaks in the range are other high eroded remnants of the shield, including Beef Peak, TaiaTaeszi Peakand Mount MacKenzie. Like most volcanoes in British Columbia, it is part of the Pacific Ring of Firewhich includes over 160 active volcanoes.
The range gets its name from the intense and varied colours of its terrains' volcanic
lavas and sands from heavy mineralization, like the Spectrum Rangein the Spatsizi Plateau.
Tweedsmuir South Provincial Park
Canada British Columbia| label=Rainbow Range
caption=Location of the Rainbow RangeThe Rainbow Range lies partly in the
Tweedsmuir South Provincial Park, while to its east the Itcha and Ilgachuz Ranges form the core of the Itcha Ilgachuz Provincial Park.
List of volcanoes in Canada
Volcanism in Canada
* [http://bivouac.com/ArxPg.asp?ArxId=1282 Rainbow Range entry in Canadian Mountain Encyclopedia]
* [http://www.skimountaineer.com/ROF/ROF.php?name=Rainbow Skiing the Pacific Ring of Fire and Beyond]
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Look at other dictionaries:
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