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[[File:MountToneyMap.jpg|thumb|Map of Toney Mountain]] | [[File:MountToneyMap.jpg|thumb|Map of Toney Mountain]] | ||
'''Toney Mountain''' is an elongated snow-covered shield volcano, 60 km (38 mi) long and rising to 3,595 meters at Richmond Peak, located 56 km (35 mi) southwest of [[Kohler Range]] in [[Westarctica]]. | '''Toney Mountain''' is an elongated [[snow]]-covered shield volcano, 60 km (38 mi) long and rising to 3,595 meters at Richmond Peak, located 56 km (35 mi) southwest of the [[Kohler Range]] in [[Westarctica]]. | ||
==Geology== | ==Geology== | ||
Toney Mountain is an elongated volcanic massif that rises from a basaltic plateau. A 3 km-wide summit caldera tops the volcano, and is elongated in east-west direction; this orientation is shared with calderas on other volcanoes in Westarctica and reflects regional tectonic stress. The slopes of the volcano feature parasitic vents and glacial corries, and are much steeper north of the volcano than south of it. Most of the mountain is covered by [[ice]] and its eastern sector may be a crater. | Toney Mountain is an elongated volcanic massif that rises from a basaltic plateau. A 3 km-wide summit caldera tops the volcano, and is elongated in east-west direction; this orientation is shared with calderas on other volcanoes in Westarctica and reflects regional tectonic stress. The slopes of the volcano feature parasitic vents and glacial corries, and are much steeper north of the volcano than south of it. Most of the mountain is covered by [[ice]] and its eastern sector may be a crater. Because the mountain is mostly [[ice]] covered, it is difficult to determine its composition, the origin of the elongated shape of the volcano, and the volcanological relation between the parasitic cinder cones and the main volcanic pile. Its volume may be about 2,800 cubic kilometers (670 cu mi). | ||
The plateau and parasitic cones are formed by hawaiite and the few outcrops on the main volcano by benmoreite and comendite. They contain phenocrysts of olivine, plagioclase, pyroxene and titanaugite in the former and of clinopyroxene, feldspar and olivine. | The plateau and parasitic cones are formed by hawaiite and the few outcrops on the main volcano by benmoreite and comendite. They contain phenocrysts of olivine, plagioclase, pyroxene and titanaugite in the former and of clinopyroxene, feldspar and olivine. | ||
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Toney Mountain was probably among those viewed from a distance by Admiral Byrd and others of the U.S. Antarctic Survey in plane flights from the ship ''Bear'' in February 1940. It was mapped in December 1957 by the oversnow traverse party from Byrd Station to the Sentinel Range, 1957–58, led by C.R. Bentley who proposed the name. | Toney Mountain was probably among those viewed from a distance by Admiral Byrd and others of the U.S. Antarctic Survey in plane flights from the ship ''Bear'' in February 1940. It was mapped in December 1957 by the oversnow traverse party from Byrd Station to the Sentinel Range, 1957–58, led by C.R. Bentley who proposed the name. | ||
The mountain was after [[George R. Toney]], the scientific leader at [[Byrd Station]] in 1957. Toney was also a participant in several Antarctic and Arctic operations, serving in both field and administrative capacities. | |||
==Features== | ==Features== | ||
* [[Creehan Cliff]] | * [[Creehan Cliff]] | ||
* [[Williamson Ridge]] | * [[Williamson Ridge]] | ||
* [[Downs Cone]] | |||
==External links== | |||
* [http://polenet.org/toney-mountain POLENET monitoring site for Toney Mountain] | |||
[[Category:Geography of Westarctica]] | [[Category:Geography of Westarctica]] | ||
[[Category:Volcanoes]] | [[Category:Volcanoes]] | ||