Large area of basaltic lava in south-central British Columbia, Canada
Map showing geological formations related to the Canadian Cascade Arc
The Chilcotin Group, also called the Chilcotin Plateau Basalts, is a large area of basaltic lava that forms a volcanic plateau running parallel with the Garibaldi Volcanic Belt in south-central British Columbia, Canada.
Predominantly, during Miocene and Pliocene times, a medium-sized volcanic field of overlapping vents occurred in British Columbia's Interior Plateau. The distribution is assumed to engulf up to 50,000 km2 of the Pacific Northwest, forming a medium-sized large igneous province, of volume 3300 km3.[1] Volcanism occurred as late as Oligocene time, but continues sporadically up to present. Eruptions were most vigorous 6-10 million years ago and 2-3 million years ago, when most of the basalt was released. Less extensive eruptions continued 0.01 to 1.6 million years ago.[2]
These lava flows have been dominantly exposed by erosion resulting from the great floods that flowed in this region throughout the past ice ages, which laid bare many layers of the basalt flows along the Fraser Canyon from Soda Creek south to Canoe Creek elsewhere along the Chilcotin, Chilko, Chilanko and Taseko Rivers, and also to the east of the Fraser River at Chasm Provincial Park and along the Upper Deadman River. Prior to Late Pleistocene glacial erosion these centers formed a series of coalesced, low-profile shield volcanoes of unknown volume and distribution.
The Chilcotin Group were thought to potentially be linked to the partly coeval Columbia River Basalt Group. However, its morphology and geochemistry have been proven much similar to other volcanic plateaus such as the Snake River Plain in Idaho and parts of Iceland (Bevier, 1983).
^Regional stratigraphy and age of Chilcotin Group basalts, south-central British Columbia Retrieved on 2012-09-22
^National Resources Canada - Catalogue of Canadian volcanoes: Chilcotin Plateau basalts Archived March 15, 2008, at the Wayback Machine Retrieved on 2008-03-15
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Helens, sending an ash column about 20 km into the stratosphere. The ChilcotinGroup is a north–south range of volcanoes in southern British Columbia running...
imperceptibly with flat-lying lava flows comprising the ChilcotinGroup lava plateau. Unlike the ChilcotinGroup basalt, which is not associated with any felsic...
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waters eroding a lava plateau over a 10 million year span called the ChilcotinGroup. The walls of the Chasm contain tones of red, brown yellow, and purple...
The Chilcotin River /tʃɪlˈkoʊtɪn/ located in Southern British Columbia, Canada is a 241 km (150 mi) long tributary of the Fraser River. The name Chilcotin...
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to 1.6 million years ago. The ChilcotinGroup were thought to potentially be linked to the Columbia River Basalt Group in the United States, which are...
volcanic eruptions have occurred in the ChilcotinGroup in the last 1.6 million years. The flat-lying ChilcotinGroup lava plateau covers an area of 25,000 km2...
Mount Noel is a Miocene volcanic complex in the ChilcotinGroup in British Columbia, Canada, located 7 km (4 mi) southwest of Bralorne and north of a...
peneplain was overlain by thin sheets of plateau basalts formed from the ChilcotinGroup lavas that flowed ten to fifteen million years ago. The area was occupied...
Stockton Hill is a volcanic plug located in the formation known as the ChilcotinGroup, which lie between the Pacific Ranges of the Coast Mountains and the...
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