Mount Fee
Mount Fee | |
---|---|
Highest point | |
Elevation | 2,162 m (7,093 ft)[1] |
Prominence | 312 m (1,024 ft) |
Coordinates | 50°04′59″N 123°15′00″W / 50.08306°N 123.25000°W[1] |
Geography | |
District | New Westminster Land District |
Parent range | Pacific Ranges |
Topo map | NTS 92J3 Brandywine Falls |
Geology | |
Age of rock | Unknown[1] |
Mountain type | Eroded volcano,[1] stratovolcano |
Volcanic arc/belt | Canadian Cascade Arc[2]Garibaldi Volcanic Belt[2] |
Last eruption | Unknown; Pleistocene age[1] |
Mount Fee is a volcanic peak in the
The mountain consists of a narrow north-south trending ridge of fine-grained volcanic rock and small amounts of fragmental material. It is 1.5 km (0.93 mi) long and 0.5 km (0.31 mi) wide with nearly vertical flanks. Mount Fee has two main summits, the southern tower of which is the highest. The summits are separated by a U-shaped crevice that gives them a prominent appearance.
Geology
Mount Fee is one of the southernmost volcanoes in the Mount Cayley volcanic field. This volcanic zone forms the central portion of the larger Garibaldi Volcanic Belt, which extends from the Silverthrone Caldera in the north to the Watts Point volcano in the south.[3] The volcanic belt has formed as a result of ongoing subduction of the Juan de Fuca Plate under the North American Plate at the Cascadia subduction zone along the British Columbia Coast.[4] This is a north-south trending fault zone about 1,000 km (620 mi) long, extending 80 km (50 mi) off the Pacific Northwest from Northern California to southwestern British Columbia. The plates move at a relative rate of over 10 mm (0.39 in) per year at an oblique angle to the subduction zone.[5]
The edifice of Mount Fee is the remains of a volcanic feature that has been significantly eroded by glacial ice.[1] It likely represents a dissected stratovolcano (also known as a composite volcano) that was larger in area and higher in elevation than its current form.[6] Stratovolcanoes can reach heights of 2,500 m (8,000 ft) and consist of alternating layers of lava flows, volcanic ash, cinders, blocks and bombs.[7] During the glacial periods, much of the volcano's original outer cone of pyroclastic material was eroded away by moving layers of ice and rock. The removal of the ejected volcanic material has exposed the dacite lava that forms the narrow north-south trending ridge of Mount Fee.[6] The Black Tusk, a pinnacle of dark volcanic rock to the southeast, is also interpreted to be the remains of a deeply eroded volcano that was once covered with pyroclastic material.[8] The present day edifice of Mount Fee contains several lava spines that reach heights of 100 m (330 ft) to 150 m (490 ft) above the main ridge.[2]
Eruptive history
Volcanic activity at Mount Fee is among the oldest in the Mount Cayley volcanic field. Its volcanic rocks remain undated, but the large amount of dissection and evidence of glacial ice overriding the volcano indicates that it formed more than 75,000 years ago before the
At least three phases of eruptive activity have been recognized at Mount Fee. The only exposed remnant of Fee's earliest volcanic activity is a minor outcrop of pyroclastic rock. This is evidence of explosive eruptions during Fee's eruptive history, as well as its first volcanic event. The second volcanic event produced a sequence of volcanic rocks on Fee's eastern flank. This volcanic material was likely deposited when a sequence of lava flows and broken lava fragments erupted from a volcanic vent and moved down the flanks during the construction of the ancestral Mount Fee. Following extensive dissection, renewed volcanism produced a viscous series of lavas on its northern flank. The U-shaped crevice separating the two main summits of Mount Fee separates this lava flow from the main volcanic ridge. The conduit from which these lava flows originated was likely vertical in structure and intruded through older rocks deposited during Fee's earlier volcanic events. This volcanic event was also followed by a period of erosion, and likely one or more glacial periods. Extensive erosion following the last volcanic event at Mount Fee has created the rugged north-south trending ridge that currently forms a prominent landmark.[1]
Petrography
The dacite and rhyodacite rocks comprising Mount Fee contain up to 70% brown
Human history
Habitation
Human habitation at Mount Fee extends from hundreds to thousands of years ago. Glassy volcanic rocks, such as rhyodacite, were widely used to make knives, chisels, adzes and other sharp tools before the arrival of Europeans in the 18th century. It was collected from a number of minor outcrops on the flanks of Mount Fee, as well as at Mount Cayley and Mount Callaghan. This material appears in goat hunting sites and at the Elaho rockshelter, collectively dated from about 100 to 8,000 years ago.[10]
In September 1928, Mount Fee was named by British mountaineer Tom Fyles after Charles Fee (1865–1927), who was a member of the British Columbia Mountaineering Club in Vancouver at the time.[11] Subsequently, Mount Fee was one of the volcanoes in the Mount Cayley volcanic field illustrated by volcanologist Jack Souther in 1980. Others included Mount Cayley, Cauldron Dome, Slag Hill, Ember Ridge and Ring Mountain, which was titled Crucible Dome at the time. Souther created a geologic map the following year that displayed the locations of the volcanoes and the regional terrain.[2]
Monitoring
Like other volcanoes in the Garibaldi Belt, Mount Fee is not monitored closely enough by the Geological Survey of Canada to ascertain how active its
Climate
Based on the
See also
- List of Cascade volcanoes
- List of volcanoes in Canada
- Volcanology of Canada
- Volcanology of Western Canada
References
- ^ a b c d e f g h "Mount Fee". Catalogue of Canadian volcanoes. Natural Resources Canada. 2009-03-10. Archived from the original on 2011-06-04. Retrieved 2010-08-03.
- ^ ISBN 0-662-29791-1. Retrieved 2010-08-03.
- ISBN 978-0-8137-0009-0.
- ^ a b "Garibaldi volcanic belt". Catalogue of Canadian volcanoes. Natural Resources Canada. 2009-04-02. Archived from the original on 2011-06-04. Retrieved 2010-08-10.
- ^ "Cascadia Subduction Zone". Geodynamics. Natural Resources Canada. 2008-01-15. Archived from the original on 2010-01-22. Retrieved 2010-08-10.
- ^ ISBN 0-521-43811-X.
- ^ "Composite Volcanoes and Stratovolcanoes, Subduction-Zone Volcanoes". United States Geological Survey. Retrieved 2010-08-04.
- ^ "Garibaldi: Where Fire Met Ice". Vancouver rocks. Natural Resources Canada. 2008-02-12. Archived from the original on 2010-05-22. Retrieved 2010-09-01.
- ^ "Garibaldi volcanic belt: Mount Cayley volcanic field". Catalogue of Canadian volcanoes. Natural Resources Canada. 2009-04-07. Archived from the original on 2011-06-04. Retrieved 2010-08-29.
- ^ Reimer/Yumks, Rudy. "Squamish Nation Cognitive Landscapes" (PDF). McMaster University. p. 9. Archived from the original (PDF) on 2008-12-19. Retrieved 2010-08-29.
- BC Geographical Names Information System. Government of British Columbia. Archivedfrom the original on 2011-07-16. Retrieved 2010-07-22.
- ^ a b c d "Monitoring volcanoes". Volcanoes of Canada. Natural Resources Canada. 2009-02-26. Archived from the original on 2011-05-14. Retrieved 2010-03-24.
- ^ Hickson, C.J.; M., Ulmi (2006-01-03). "Volcanoes of Canada" (PDF). Natural Resources Canada. p. 79. Archived from the original (PDF) on 2008-04-08. Retrieved 2010-09-24.
- ISSN 1027-5606.
External links
- "Mount Fee". Bivouac.com.
- "Mount Fee". Geographical Names Data Base. Natural Resources Canada.
- Garibaldi Volcanic Belt (Mount Cayley area) Map of Canadian volcanoes. Natural Resources Canada. 2005-08-20