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Milbanke Sound Group

火砕丘 · Canada · 233m

The Milbanke Sound Group contains several cones, with the best preserved Kitasu Hill scoria cone on Swindle Island in the center of this July 2018 Planet Labs satellite image monthly mosaic (N is at the top; this image is approximately 15 km across). Nearby Lake Island and Lady Douglas Island also contain cones and lava flows.
The Milbanke Sound Group contains several cones, with the best preserved Kitasu Hill scoria cone on Swindle Island in the center of this July 2018 Planet Labs satellite image monthly mosaic (N is at the top; this image is approximately 15 km across). Nearby Lake Island and Lady Douglas Island also contain cones and lava flows. · 写真: Satellite image courtesy of Planet Labs Inc., 2018 (https://www.planet.com/). · Wikimedia Commons
タイプ
火砕丘
国
Canada
地域
North America Volcanic Regions / 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
Intraplate / Continental crust (> 25 km)
火山地形
Minor (Basaltic)
主要岩石
Basalt / Picro-Basalt
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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