Английская Википедия:Bridge River Cones
The Bridge River Cones, sometimes referred to as the Lillooet Cones and Salal Creek Cones, is the name given to a volcanic field located on the north flank of the upper Bridge River, about Шаблон:Convert west of the town of Gold Bridge. The cones are in the lee of the Lillooet Icecap and sit astride a group of passes between the Bridge River, which flows W-E to their south, and the Lord River, which flows north to the Taseko Lakes in the Chilcotin District.
Geology
The Bridge River Cones consist of small trachybasaltic and basaltic eruptive centers. Sham Hill (Шаблон:Coord), a Шаблон:Convert high steep-sided volcanic plug, is the oldest volcano in the field with a potassium-argon date of one million years.[1] The plug is approximately Шаблон:Convert wide and its bare glaciated surface, strewn with glacial erratics, consists of large subhorizontal columns formed within the central conduit of an eroded stratovolcano.[1]
The Salal Glacier volcanic complex (Шаблон:Coord), with a potassium-argon date of 0.97 to 0.59 million years, contains subaerial tephra and thin scoriaceous flows in the upper part of the pile are surrounded by ice-ponded flows up to Шаблон:Convert thick.[1]
Tuber Hill (Шаблон:Coord), a small basaltic stratovolcano with a potassium-argon date of 0.6 million years, was constructed on the Bridge River upland when neighboring valleys were filled by ice.[1] Where distal flows violated on the glaciers a marginal meltwater lake was created in which less than Шаблон:Convert of interbedded hyaloclastite, debris flows, and lacustrine tuff were deposited.[1]
The youngest volcanic rocks in the Bridge River volcanic field lie east of Tuber Hill and are remnants of valley-filling basalt flows.[1] The age of these valley-filling basalt flows is unknown but the presence of unconsolidated glacial until under the flows suggest they are less than 1,500 years old.[1]
See also
- Bridge River Power Project
- Bridge River, British Columbia
- Bridge River Indian Band
- Bridge River Canyon
- Bridge River Country
- Garibaldi Volcanic Belt
- Cascade Volcanoes
- Cascade Range
- Spruce Lake Protected Area
- Tsʼilʔos Provincial Park
- Lillooet Icecap
- List of volcanoes in Canada
- Volcanism of Canada
- Volcanism of Western Canada
References
External links
- Шаблон:Cite web
- Шаблон:Cite web
- Шаблон:Cite web
- Шаблон:Cite web
- "NASA/JPL satellite images" location only
- Шаблон:Cite gvp
Шаблон:Garibaldi Volcanic Belt
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