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Cono Nazko

Nazko

Cono piroclastico · Canada · 1238 m

Nazko cone is the easternmost and youngest volcano of the Anahim volcanic belt in the Chilcotin-Nechako Plateau in central British Columbia. The 120-m-high cone is seen here across a valley from the SW. The central subglacial mound is partly enveloped by younger, coalescing cones that form the summit ridge. A 7,200-year-old lava flow forms the forested margin of the swamp in the middle foreground.
Nazko cone is the easternmost and youngest volcano of the Anahim volcanic belt in the Chilcotin-Nechako Plateau in central British Columbia. The 120-m-high cone is seen here across a valley from the SW. The central subglacial mound is partly enveloped by younger, coalescing cones that form the summit ridge. A 7,200-year-old lava flow forms the forested margin of the swamp in the middle foreground. · Foto: Photo by Geological Survey of Canada (courtesy of Cathie Hickson). · Wikimedia Commons
Tipo
Cono piroclastico
Paese
Canada
Regione
Nord America / Interior Western Canada Volcanic Province
Altitudine
1238 m
Coordinate
52.928, -123.732
Ultima eruzione
-5220
Contesto tettonico
Intraplate / Continental crust (> 25 km)
Forma vulcanica
Minor (Basaltic)
Roccia principale
Trachybasalt / Tephrite Basanite
Sintesi geologica

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.

Sintesi da Wikipedia

Riassunto in inglese

Nazko Cone is a small potentially active basaltic cinder cone in central British Columbia, Canada, located 75 km west of Quesnel and 150 kilometers southwest of Prince George. It is considered the easternmost volcano in the Anahim Volcanic Belt. The small tree-covered cone rises 120 m above the Chilcotin-Nechako Plateau and rests on glacial till. It was formed in three episodes of activity, the first of which took place during the Pleistocene interglacial stage about 340,000 years ago. The second stage produced a large hyaloclastite scoria mound erupted beneath the Cordilleran Ice Sheet during the Pleistocene. Its last eruption produced two small lava flows that traveled 1 km to the west, along with a blanket of volcanic ash that extends several km to the north and east of the cone.

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Storia delle eruzioni

Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni
5220 BCE~5220 BCE · 1 eruzioni · VEI max. ?5220 BCE5220 BCE5219 BCE5219 BCE5219 BCE

Cronologia dettagliata

  1. 5220 a.C. (±100 anni)VEI ?Stima geologica
    BCE 5220 – In corso

Link esterni

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