The Spectrum Range, formerly called the Spectrum Mountains and the Rainbow Mountains, is a subrange of the Tahltan Highland in the

Stikine Country The Stikine Country , also referred to as the Stikine District or simply "the Stikine", is one of the historical geographic regions of the Canadian province of British Columbia, located inland from the central Alaska Panhandle and comprising the ...

of northwestern British Columbia, 20 km west of the Stewart-Cassiar Highway, south of Mount Edziza and north of the Arctic Lake Plateau. The Spectrum Range falls within Mount Edziza Provincial Park. The range is lightly glaciated, as compared to the other ranges to the west. It is accessible only by foot or via helicopter; there are no roads to the range.

Geology

Like the Rainbow and Itcha–

Ilgachuz Range The Ilgachuz Range is a name given to an extinct shield volcano in British Columbia, Canada. It is not a mountain range in the normal sense, because it was formed as a single volcano that has been eroded for the past 5 million years. It lies on ...

s at the western end of the Chilcotin Plateau farther south, the range's name derives from the brilliant colours that are symptomatic from heavy mineralization comprising the material forming the range. The Spectrum Range is one of four large

stratovolcano A stratovolcano, also known as a composite volcano, is a conical volcano built up by many layers (strata) of hardened lava and tephra. Unlike shield volcanoes, stratovolcanoes are characterized by a steep profile with a summit crater and per ...

es that make up the Mount Edziza volcanic complex. A predominantly

lava dome In volcanology, a lava dome is a circular mound-shaped protrusion resulting from the slow extrusion of viscous lava from a volcano. Dome-building eruptions are common, particularly in convergent plate boundary settings. Around 6% of eruptions on ...

overlies a basal

shield volcano A shield volcano is a type of volcano named for its low profile, resembling a warrior's shield lying on the ground. It is formed by the eruption of highly fluid (low viscosity) lava, which travels farther and forms thinner flows than the more v ...

. The range is Pliocene in age and on its southwestern flank contains Pleistocene subglacial and subaerial cones and its northwest and southwest sides contain Holocene pyroclastic cones and

lava flows Lava is molten or partially molten rock ( magma) that has been expelled from the interior of a terrestrial planet (such as Earth) or a moon onto its surface. Lava may be erupted at a volcano or through a fracture in the crust, on land o ...

. The youngest feature in the volcanic complex could be

The Ash Pit The Ash Pit is an inactive volcanic crater, located in the Spectrum Range in British Columbia, Canada. It is Holocene in age and is considered the youngest feature in the Spectrum Range volcanic complex. It is within the Northern Cordilleran Volc ...

Mountains

*Artifact Ridge *Kitsu Peak *Kounugu Mountain *Kuno Peak * Little Iskut * Obsidian Ridge *

Spectrum Dome Spectrum Dome is a lava dome in the Spectrum Range of northwestern British Columbia, Canada. It last erupted during the Pliocene epoch.Yeda Peak Yeda Peak is a volcano and the highest peak of the Spectrum Range in the Boundary Ranges of northwestern British Columbia, Canada, located southwest of Tatogga and south of Kitsu Peak. It is believed Yeda Peak last erupted during the Pliocene ...

References

External links

Canadian Mountain Encyclopedia
* Image:Spectrum Range colours.JPG, Spectrum Range colours from heavy mineralization {{Interior Mountains Mount Edziza volcanic complex Stratovolcanoes of Canada Lava domes Pliocene volcanoes Polygenetic volcanoes Tahltan Highland Mountain ranges of British Columbia

Geology

Mountains

See also

References

External links