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feeders, which locally crosscut lava flows. Recent studies indicate that the volume of the
Chilcotin Group is much less than previously thought, and that the "Plateau" is likely Eocene in age. This means that the Chilcotin is likely composed of many local volcanic vents, that were of small volumes
77:, of volume 3300 km. 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.
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The distribution and volume of the
Chilcotin Group is unknown due to extensive Pleistocene glacial cover. This presumably glacial "drift" is very thick, and in most regions completely obscures the volcanism. Individual vents for
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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
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erupted with periodic regularity for over 27 million years, even as they do today. The ultimate cause of this volcanism is still up for debate, however, the most widely accepted idea is that a
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Cliffs made of low viscosity lava flows in Chasm
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systems while volcanism along its northern portion is most widely believed to have been related to a center of upwelling
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that fed into the paleo-landscape, and subsequently are found in the major river systems that we see at present.
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initiated the widespread and voluminous basaltic volcanism. Some centers erupted along pre-existing brittle
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times, a medium-sized volcanic field of overlapping vents occurred in
British Columbia's
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Regional stratigraphy and age of
Chilcotin Group basalts, south-central British Columbia
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The
Cheslatta Lake suite:Miocene mafic, alkaline magmatism in central British Columbia
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National
Resources Canada - Catalogue of Canadian volcanoes: Chilcotin Plateau basalts
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The
Chilcotin Group were thought to potentially be linked to the partly coeval
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Large area of basaltic lava in south-central
British Columbia, Canada
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23:Map showing geological formations related to the
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109:, and also to the east of the Fraser River at
173:Prior to 16 million years ago, the western
238:Volcanoes of the Chilcotin Group include:
234:and cliffs made of lava flows and ash beds
140:Formation of the Chilcotin Plateau Basalts
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395:Northern Cordilleran Volcanic Province
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410:Wells Gray-Clearwater volcanic field
215:which also in turn form part of the
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512:Geologic groups of British Columbia
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487:Plateaus of British Columbia
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405:Volcanism in Western Canada
390:List of volcanoes in Canada
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126:Columbia River Basalt Group
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507:Landforms of the Chilcotin
46:running parallel with the
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36:Chilcotin Plateau Basalts
186:Cascadia subduction zone
157:volcanism include small
453:Retrieved on 2008-03-15
449:March 15, 2008, at the
431:Retrieved on 2012-09-22
385:Garibaldi Volcanic Belt
48:Garibaldi Volcanic Belt
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132:in Idaho and parts of
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57:Predominantly, during
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502:Pleistocene volcanism
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111:Chasm Provincial Park
38:, is a large area of
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482:Canadian Cascade Arc
370:Anahim Volcanic Belt
318:Chilcotin Creek Cone
217:Anahim Volcanic Belt
175:Cascade Volcanic Arc
93:elsewhere along the
25:Canadian Cascade Arc
400:Volcanism in Canada
328:Black Dome Mountain
115:Upper Deadman River
497:Pliocene volcanism
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42:lava that forms a
34:, also called the
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492:Miocene volcanism
375:Chilcotin Plateau
308:West Kettle River
130:Snake River Plain
71:Pacific Northwest
50:in south-central
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380:Chilcotin Ranges
343:Tin Cup Mountain
298:Nicola (Chester)
213:shield volcanoes
136:(Bevier, 1983).
119:shield volcanoes
67:Interior Plateau
52:British Columbia
44:volcanic plateau
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303:Quilchena Creek
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348:Mount Begbie
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273:Canoe Creek
268:Alkali Lake
248:Browns Lake
210:Itcha Range
196:called the
184:behind the
91:Canoe Creek
476:Categories
416:References
358:Lone Butte
283:Leon Creek
87:Soda Creek
54:, Canada.
278:Dog Creek
253:Crows Bar
95:Chilcotin
89:south to
447:Archived
364:See also
206:Ilgachuz
167:gabbroic
103:Chilanko
63:Pliocene
40:basaltic
202:Rainbow
134:Iceland
59:Miocene
165:, and
155:basalt
99:Chilko
194:magma
190:fault
85:from
208:and
105:and
61:and
30:The
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