Mount Harper
Encyclopedia
Mount Harper is a deeply eroded Late Proterozoic
volcanic complex located 71 km (44.1 mi) north of Dawson City
and 33 km (20.5 mi) west of Mount Gibben. Mount Harper is in the Ogilvie Mountains
and is the 1200 m (3,937 ft) thick remnant of a subaqueous-to-emergent basalt
ic shield volcano
capped by small rhyodacitic
and andesitic
lava flows. It oversteps the Harper Fault.
Proterozoic
The Proterozoic is a geological eon representing a period before the first abundant complex life on Earth. The name Proterozoic comes from the Greek "earlier life"...
volcanic complex located 71 km (44.1 mi) north of Dawson City
Dawson City, Yukon
The Town of the City of Dawson or Dawson City is a town in the Yukon, Canada.The population was 1,327 at the 2006 census. The area draws some 60,000 visitors each year...
and 33 km (20.5 mi) west of Mount Gibben. Mount Harper is in the Ogilvie Mountains
Ogilvie Mountains
The Ogilvie Mountains are a mountain range in the Yukon Territory that lie north of Dawson City and are crossed by the Dempster Highway. The best known mountains are part of the Tombstone Territorial Park ....
and is the 1200 m (3,937 ft) thick remnant of a subaqueous-to-emergent basalt
Basalt
Basalt is a common extrusive volcanic rock. It is usually grey to black and fine-grained due to rapid cooling of lava at the surface of a planet. It may be porphyritic containing larger crystals in a fine matrix, or vesicular, or frothy scoria. Unweathered basalt is black or grey...
ic shield volcano
Shield volcano
A shield volcano is a type of volcano usually built almost entirely of fluid lava flows. They are named for their large size and low profile, resembling a warrior's shield. This is caused by the highly fluid lava they erupt, which travels farther than lava erupted from more explosive volcanoes...
capped by small rhyodacitic
Rhyodacite
Rhyodacite is an extrusive volcanic rock intermediate in composition between dacite and rhyolite. It is the extrusive equivalent of granodiorite. Phenocrysts of sodium rich plagioclase, sanidine, quartz, and biotite or hornblende are typically set in an aphanitic to glassy light to intermediate...
and andesitic
Andesite
Andesite is an extrusive igneous, volcanic rock, of intermediate composition, with aphanitic to porphyritic texture. In a general sense, it is the intermediate type between basalt and dacite. The mineral assemblage is typically dominated by plagioclase plus pyroxene and/or hornblende. Magnetite,...
lava flows. It oversteps the Harper Fault.
See also
- List of volcanoes in Canada
- Volcanism in CanadaVolcanism in CanadaVolcanism of Canada has produced lava flows, lava plateaus, lava domes, cinder cones, stratovolcanoes, shield volcanoes, submarine volcanoes, calderas, diatremes, and maars, along with examples of more less common volcanic forms such as tuyas and subglacial mounds...
External links
- Mount Harper in the Canadian Mountain Encyclopedia