Nazko

sopka – Pyroclastic cone(s), Canada, North America Volcanic Regions

Kde

Canada, North America Volcanic Regions

Typ (GVP)

Pyroclastic cone(s)

Nadmořská výška

1 238 m

Tektonické prostředí

Intraplate / Continental crust (> 25 km)

Poslední známá erupce

5 220 př. n. l.

Poloha

52,928°, -123,732°

Nazko Cone, the easternmost and youngest volcano of the Anahim Volcanic Belt in the Chilcotin-Nechako Plateau, central British Columbia, rests on glacial till. It was formed in three episodes of activity, the first of which took place during a Pleistocene interglacial stage about 340,000 years ago (Souther et al., 1987). The second stage produced a large hyaloclastite scoria mound erupted beneath the Cordilleran ice sheet during the late Pleistocene. The final activity occurred about 7,200 years ago, forming a compound subaerial basanitic cinder cone that overtopped the hyaloclastite mound and produced two small lava flows that traveled about 1 km W. An airfall tephra deposit extends several kilometers to the N and E. Mining of the red cinder and scoria deposits began in the early 1990s.

Text: Smithsonian Global Volcanism Program.

Údaje o sopce: Smithsonian Global Volcanism Program. Další sopky a průduchy.