カナダ · 火砕丘
ナズココーン
Nazko
- タイプ
- 火砕丘
- 標高
- 1238m
- 最終噴火
- -5220年
- タイプ
- 火砕丘
- 国
- カナダ
- 地域
- 北アメリカ / Interior Western Canada Volcanic Province
- 標高
- 1238m
- 座標
- 52.928, -123.732
- 最終噴火
- -5220年
- テクトニクス環境
- プレート内部 / 大陸地殻 (> 25 km)
- 火山地形
- 小規模 (玄武岩質)
- 主要岩石
- 粗面玄武岩 / テフライト・バサナイト
地質学的概要
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 の要約
英語版の要約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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噴火履歴
1件の記録用語集詳細タイムライン
- 紀元前 5220年 (±100年)VEI ?地質学的推定紀元前 5220 ~ 終了日不明
近くの火山
外部リンク
⚠ 参考情報です。緊急対応には使用しないでください。