145:
228:
20:
169:
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.
152:
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
80:
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
180:
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
272:
247:
317:
466:
342:
297:
337:
302:
312:
292:
257:
352:
262:
242:
511:
252:
446:
148:
Cliffs made of low viscosity lava flows in Chasm
Provincial Park suggest extensive volcanic activity in the Chilcotin Plateau Basalts
394:
486:
409:
506:
192:
systems while volcanism along its northern portion is most widely believed to have been related to a centre of upwelling
322:
201:
170:
that fed into the paleo-landscape, and subsequently are found in the major river systems that we see at present.
128:. However, its morphology and geochemistry have been proven much similar to other volcanic plateaus such as the
501:
219:. The exact nature of the relationship between the Anahim hotspot and the Chilcotin Group is unknown, however.
90:
481:
357:
267:
188:
initiated the widespread and voluminous basaltic volcanism. Some centers erupted along pre-existing brittle
428:
496:
404:
389:
125:
491:
117:. Prior to Late Pleistocene glacial erosion these centers formed a series of coalesced, low-profile
277:
185:
384:
47:
144:
516:
74:
110:
443:
369:
216:
24:
8:
399:
327:
65:
times, a medium-sized volcanic field of overlapping vents occurred in
British Columbia's
429:
Regional stratigraphy and age of
Chilcotin Group basalts, south-central British Columbia
467:
The
Cheslatta Lake suite:Miocene mafic, alkaline magmatism in central British Columbia
444:
National
Resources Canada - Catalogue of Canadian volcanoes: Chilcotin Plateau basalts
374:
307:
174:
129:
70:
379:
66:
51:
43:
450:
189:
177:
94:
212:
205:
197:
181:
124:
The
Chilcotin Group were thought to potentially be linked to the partly coeval
118:
102:
475:
162:
114:
82:
227:
347:
332:
287:
231:
106:
98:
209:
158:
282:
86:
19:
16:
Large area of basaltic lava in south-central
British Columbia, Canada
69:. The distribution is assumed to engulf up to 50,000 km of the
200:(similar to that associated with present-day Hawaii), creating the
62:
58:
133:
166:
154:
39:
193:
139:
23:Map showing geological formations related to the
473:
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
226:
143:
18:
474:
395:Northern Cordilleran Volcanic Province
439:
437:
410:Wells Gray-Clearwater volcanic field
215:which also in turn form part of the
121:of unknown volume and distribution.
512:Geologic groups of British Columbia
13:
14:
528:
460:
434:
222:
422:
1:
415:
487:Plateaus of British Columbia
7:
405:Volcanism in Western Canada
390:List of volcanoes in Canada
363:
126:Columbia River Basalt Group
10:
533:
507:Landforms of the Chilcotin
46:running parallel with the
73:, forming a medium-sized
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
235:
149:
132:in Idaho and parts of
75:large igneous province
57:Predominantly, during
27:
502:Pleistocene volcanism
230:
147:
111:Chasm Provincial Park
38:, is a large area of
22:
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
236:
150:
42:lava that forms a
34:, also called the
28:
492:Miocene volcanism
375:Chilcotin Plateau
308:West Kettle River
130:Snake River Plain
71:Pacific Northwest
50:in south-central
524:
454:
441:
432:
426:
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
532:
531:
527:
526:
525:
523:
522:
521:
472:
471:
463:
458:
457:
451:Wayback Machine
442:
435:
427:
423:
418:
366:
338:Alasla Mountain
303:Quilchena Creek
225:
178:stratovolcanoes
142:
32:Chilcotin Group
17:
12:
11:
5:
530:
520:
519:
514:
509:
504:
499:
494:
489:
484:
470:
469:
462:
461:External links
459:
456:
455:
433:
420:
419:
417:
414:
413:
412:
407:
402:
397:
392:
387:
382:
377:
372:
365:
362:
361:
360:
355:
350:
345:
340:
335:
330:
325:
323:Lightning Peak
320:
315:
313:Hydraulic Lake
310:
305:
300:
295:
293:Missezula Lake
290:
285:
280:
275:
270:
265:
260:
258:Prentice Gulch
255:
250:
245:
224:
221:
198:Anahim hotspot
182:back-arc basin
163:volcanic plugs
141:
138:
113:and along the
15:
9:
6:
4:
3:
2:
529:
518:
517:Flood basalts
515:
513:
510:
508:
505:
503:
500:
498:
495:
493:
490:
488:
485:
483:
480:
479:
477:
468:
465:
464:
452:
448:
445:
440:
438:
430:
425:
421:
411:
408:
406:
403:
401:
398:
396:
393:
391:
388:
386:
383:
381:
378:
376:
373:
371:
368:
367:
359:
356:
354:
353:Forestry Hill
351:
349:
346:
344:
341:
339:
336:
334:
331:
329:
326:
324:
321:
319:
316:
314:
311:
309:
306:
304:
301:
299:
296:
294:
291:
289:
286:
284:
281:
279:
276:
274:
271:
269:
266:
264:
263:Thaddeus Lake
261:
259:
256:
254:
251:
249:
246:
244:
243:Alixton Creek
241:
240:
239:
233:
229:
223:Notable vents
220:
218:
214:
211:
207:
203:
199:
195:
191:
187:
183:
179:
176:
171:
168:
164:
160:
156:
146:
137:
135:
131:
127:
122:
120:
116:
112:
108:
107:Taseko Rivers
104:
100:
96:
92:
88:
84:
83:Fraser Canyon
78:
76:
72:
68:
64:
60:
55:
53:
49:
45:
41:
37:
33:
26:
21:
424:
348:Mount Begbie
333:Skoatl Point
288:Lambly Creek
237:
232:Chilko River
172:
159:cinder cones
151:
123:
79:
56:
35:
31:
29:
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
478::
436:^
204:,
161:,
101:,
97:,
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.