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Anahim Volcanic Belt
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The AnahimVolcanic Belt
Volcanism of Canada portal
From Wikipedia, the free encyclopedia
TheAnahim Volcanic Belt is a
600 km (373 mi) long volcanic belt,
stretching from just north ofVancouver Island to
nearQuesnel,
British Columbia, Canada. The
Anahim Volcanic Belt has had three
main magmatic episodes: 1513 Ma,
96 Ma, and 31 Ma. The volcanoes
generally become younger eastward
at a rate of 2 cm (0.8 in) to 3.3 cm
(1.3 in) a year. The Nazko Cone,
which last erupted only 7,200 years
ago, is the youngest Anahim
volcano. These volcanoes are
thought to have formed as a result of the North American Plate
sliding westward over a long-lived center of upwelling magma called
the
Anahim hotspot. The hotspot is thought to be similar to the one
feeding the Hawaiian Islands.
Future volcanism is most likely in the form ofbasalticcinder
cones, but eruptions of less mafic magma, typical of the eastern
portions of
the belt, cannot be ruled out. A series of earthquakes began
October 9th, 2007 in the vicinity of Nazko Cone which was related
to intense
subterraenean volcanic activity in the area.
The volcanic belt is defined by 37Quaternary basalt centers and
three large shield volcanoes called the Rainbow Range, Ilgachuz
Range
and the Itcha Range. These three large volcanoes have built up
dome-like piles of lava and fragmental rocks to a height of 8,130
feet
(2,478 m) at Tsitsutl Peak in the Rainbow Range, 7,873 feet
(2,400 m) at Far Mountain in the Ilgachuz Range, and 7,760 feet
(2,365 m) at
Mount Downton in the Itcha Range. The Rainbow Range is a low
dome-like cone about 20 miles (32 km) diameter, with Anahim Peak
an
obsidian plug on its north-east flank. The Ilgachuz Range is 15
miles (24 km) or more in diameter, and the Itcha Range is 10
miles
(16 km) wide and about 40 miles (64 km) long. All have been
dissected by late Tertiary, pre-Pleistocenestreamerosion.
Major volcanoes of the Anahim Volcanic Belt include:
Ilgachuz Range, 2,410 metres (7,907 ft)
Itcha Range, 2,368 metres (7,769 ft)
Rainbow Range, 2,478 metres (8,130 ft)
See also
20072008 Nazko earthquakes
List of volcanoes in Canada
Volcanism of Canada
Volcanism of Western Canada
Northern Cordilleran Volcanic Province
Garibaldi Volcanic Belt
Chilcotin Group
Wells Gray-Clearwater volcanic field
External links
Natural Resources Canada
This article about a location in British Columbia, Canada is a
stub. You can help Wikipedia byexpanding
it.
Categories: British Columbia geography stubs Anahim Volcanic
Belt
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