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ガリバルディ山

Garibaldi

成層火山 · Canada · 2678m

Mount Garibaldi, rising above Garibaldi Lake to the north, is a largely Pleistocene stratovolcano with a summit lava dome complex. The volcano was partially constructed over the Cordilleran ice sheet and contains many ice-contact features. Its final eruptions during the early Holocene included lava flows that mantled the western landside scarp and a massive lava flow from Opal Cone, a SE flank vent, that traveled 20 km to the south and west.
Mount Garibaldi, rising above Garibaldi Lake to the north, is a largely Pleistocene stratovolcano with a summit lava dome complex. The volcano was partially constructed over the Cordilleran ice sheet and contains many ice-contact features. Its final eruptions during the early Holocene included lava flows that mantled the western landside scarp and a massive lava flow from Opal Cone, a SE flank vent, that traveled 20 km to the south and west. · 写真: Photo by Lee Siebert, 1983 (Smithsonian Institution). · Wikimedia Commons
タイプ
成層火山
国
Canada
地域
North America Volcanic Regions / Garibaldi Volcanic Arc
標高
2678m
座標
49.850, -123.000
最終噴火
-8060年
テクトニクス環境
Subduction zone / Continental crust (> 25 km)
火山地形
Composite
主要岩石
Dacite
地質学的概要

Mount Garibaldi at the head of Howe Sound north of Vancouver is a Pleistocene dacitic stratovolcano capped by a lava dome complex. An initial period of volcanism 0.51-0.22 million years ago was followed after a period of quiescence by construction of a conical plug dome and breccia pile at the south summit, Atwell Peak. Retreat of the ice cap left the W flank unsupported, and it collapsed in a series of landslides, exposing the core of the volcano. Lava flows from Dalton Dome north of Atwell Peak subsequently flowed down the scarp. Subglacial flank centers such as Eanastick (Enostuck) Meadow, Glacier Pike, and Paul Ridge were also formed during the late Pleistocene. The final activity formed the Opal Cone on the SE flank and the lengthy Ring Creek lava flow, which filled a glaciated valley on the S flank during the early Holocene (Mathews, 1958; Brooks and Friele, 1992).

Wikipedia の要約

英語版の要約

Mount Garibaldi is a dormant stratovolcano in the Garibaldi Ranges of the Pacific Ranges in southwestern British Columbia, Canada. It has a maximum elevation of 2,678 metres and rises above the surrounding landscape on the east side of the Cheakamus River in New Westminster Land District. In addition to the main peak, Mount Garibaldi has two named sub-peaks. Atwell Peak is a sharp, conical peak slightly higher than the more rounded peak of Dalton Dome. Both were volcanically active at different times throughout Mount Garibaldi's eruptive history. The northern and eastern flanks of Mount Garibaldi are obscured by the Garibaldi Névé, a large snowfield containing several radiating glaciers. Flowing from the steep western face of Mount Garibaldi is the Cheekye River, a tributary of the Cheakamus River. Opal Cone on the southeastern flank is a small volcanic cone from which a lengthy lava flow descends. The western face is a landslide feature that formed in a series of collapses between 12,800 and 11,500 years ago. These collapses resulted in the formation of a large debris flow deposit that fans out into the Squamish Valley.

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噴火履歴

概要 (VEI時系列)
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8060 BCE~8060 BCE · 1件 · 最大 VEI 38060 BCE8060 BCE8059 BCE8059 BCE8059 BCE

詳細タイムライン

  1. 紀元前 8060年 (±500年)VEI 3地質学的推定
    BCE 8060 ~ 進行中
    SE flank (Opal Cone)

外部リンク

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