Bridge River Cones

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Bridge River Cones
Elevation 2,500 m (8,200 ft)
Location
Location Upper Bridge River, British Columbia, Canada
Range Pacific Ranges
Coordinates 50°51′30″N 123°24′00″W / 50.85833°N 123.40000°W / 50.85833; -123.40000
Geology
Type Volcanic field
Age of rock Holocene
Volcanic arc/belt Canadian Cascade Arc
Garibaldi Volcanic Belt
Last eruption Unknown, possibly younger than 500[1]

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 40 km (25 mi) 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[edit]

The Bridge River Cones consist of small trachybasaltic and basaltic eruptive centers. Sham Hill (50°54′N 123°31′W / 50.90°N 123.51°W / 50.90; -123.51), a 60 m (197 ft) 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 300 m (984 ft) 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 (50°47′N 123°23′W / 50.79°N 123.38°W / 50.79; -123.38), 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 100 m (328 ft) thick.[1]

Tuber Hill (50°56′N 123°26′W / 50.93°N 123.44°W / 50.93; -123.44), 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 150 m (492 ft) of interbedded hyaloclastite, debris flows, and lacustrine tuff were depositied.[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[edit]

Map of the Garibaldi Volcanic Belt volcanoes, including the Bridge River Cones area.

References[edit]

  1. ^ a b c d e f g h Wood, Charles A.; Kienle, Jürgen (2001). Volcanoes of North America: United States and Canada. Cambridge, England: Cambridge University Press. ISBN 978-0-521-43811-7. OCLC 27910629. 

External links[edit]