カナダ · 火砕丘
Milbanke Sound Group
- タイプ
- 火砕丘
- 標高
- 233m
- 最終噴火
- 不明
- タイプ
- 火砕丘
- 国
- カナダ
- 地域
- 北アメリカ / Queen Charlotte Volcano Group
- 標高
- 233m
- 座標
- 52.498, -128.723
- 最終噴火
- 不明
- 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
- 玄武岩 / ピクライト質玄武岩
地質学的概要
Swindle, Lake, and Lady Douglas Islands in the Milbanke Sound area of the Fiord Ranges in west-central British Columbia contain cinder cones of Holocene age. Kitasu Hill on the western side of Swindle Island is a young basaltic cone that produced lava flows that extend to the north. Other postglacial vents identified by Dolmage (1921, 1924) are correlated by lithology only and may be as old as Tertiary (Baer, 1973; Holland, 1976). Basaltic tuff breccias on Lake Island and Lady Douglas Island originated from Helmet Peak on Lady Island. Basaltic lava flows from Price and Dufferin Islands overlie adjacent beach deposits (Souther; in Wood and Kienle, 1990).
Wikipedia の要約
英語版の要約The Milbanke Sound Group, also called the Milbanke Sound Cones, is an enigmatic group of five small basaltic volcanoes in the Kitimat Ranges of the Coast Mountains in British Columbia, Canada. Named for Milbanke Sound, this volcanic group straddles on at least four small islands, including Swindle, Price, Lady Douglas and Lake Island. Not much is known about this group of volcanoes and they remain undated. However, they all likely formed in the past 10,000 years after the last glacial period as evidenced by a small amount of erosion. The age of the most recent volcanic activity is also unknown. Most of the Milbanke Sound Cones are covered by mature forest. Kitasu Hill and Helmet Peak are the only two cones that are officially named.
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