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カナダ · 火山原

Garibaldi Lake volcanic field

Garibaldi Lake

タイプ
火山原
標高
2316m
最終噴火
不明
Garibaldi Lake volcanic field
写真: Seattle Skier (talk · contribs) · CC BY 2.5 · Wikimedia Commons
タイプ
火山原
国
カナダ
地域
北アメリカ / Garibaldi Volcanic Arc
標高
2316m
座標
49.933, -123.000
最終噴火
不明
テクトニクス環境
沈み込み帯 / 大陸地殻 (> 25 km)
火山地形
火山群
主要岩石
安山岩 / 玄武岩質安山岩
地質学的概要

A group of nine small andesitic stratovolcanoes and basaltic andesite vents in the scenic Garibaldi Lake area immediately north of Mount Garibaldi was formed during the late Pleistocene and early Holocene. The oldest stratovolcano, The Black Tusk, formed between about 1.3 and 1.1 million years ago (Ma). Following glacial dissection, renewed volcanism (0.21-0.17 Ma) produced the lava dome and flow forming its summit. Other Pleistocene vents are located along and to the west of the Cheakamus River. The Cinder Cone, to the east of The Black Tusk, produced a 9-km-long lava flow during the late Pleistocene or early Holocene (0.04 +/- 0.04 Ma). Mount Price, west of Garibaldi Lake, was formed in three stages dating back to 1.1 million years, the latest of which produced two large lava flows from Clinker Peak during the early Holocene that ponded against the retreating continental ice sheet and formed the barrier containing Garibaldi Lake. The Table, a steep-sided subglacial tuya south of Garibaldi Lake, was also formed during the early Holocene.

Wikipedia の要約

英語版の要約

The Garibaldi Lake volcanic field is a volcanic field, located in British Columbia, Canada. It was formed by a group of nine small andesitic stratovolcanoes and basaltic andesite vents in the scenic Garibaldi Lake area immediately north of Mount Garibaldi during the late Pleistocene and early Holocene. The oldest stratovolcano, The Black Tusk, formed between about 1.3 and 1.1 million years ago (Ma). Following glacial dissection, renewed volcanism produced the lava dome and flow forming its summit. Other Pleistocene vents are located along and to the west of the Cheakamus River. Cinder Cone, to the east of The Black Tusk, produced a 9-km-long lava flow during the late Pleistocene or early Holocene.

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