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Nazko Cone

Nazko

화쇄구 · Canada · 1238m

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. · 사진: Photo by Geological Survey of Canada (courtesy of Cathie Hickson). · Wikimedia Commons
화산 유형
화쇄구
국가
Canada
지역
North America Volcanic Regions / Interior Western Canada Volcanic Province
해발
1238m
좌표
52.928, -123.732
마지막 분화
-5220년
판구조 환경
Intraplate / Continental crust (> 25 km)
화산 지형
Minor (Basaltic)
주요 암석
Trachybasalt / Tephrite Basanite
지질학적 요약

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.

Wikipedia 요약

영어 요약

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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분화 이력

요약 (VEI 시계열)
막대를 클릭하면 개별 분화가 표시됩니다
5220 BCE~5220 BCE · 1건 · 최고 VEI ?5220 BCE5220 BCE5219 BCE5219 BCE5219 BCE

상세 타임라인

  1. 기원전 5220년 (±100년)VEI ?지질학적 추정
    BCE 5220 ~ 진행 중

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