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Monte Garibaldi

Garibaldi

Stratovulcano · Canada · 2678 m

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. · Foto: Photo by Lee Siebert, 1983 (Smithsonian Institution). · Wikimedia Commons
Tipo
Stratovulcano
Paese
Canada
Regione
Nord America / Garibaldi Volcanic Arc
Altitudine
2678 m
Coordinate
49.850, -123.000
Ultima eruzione
-8060
Contesto tettonico
Subduction zone / Continental crust (> 25 km)
Forma vulcanica
Composite
Roccia principale
Dacite
Sintesi geologica

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).

Sintesi da Wikipedia

Riassunto in inglese

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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Storia delle eruzioni

Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni
8060 BCE~8060 BCE · 1 eruzioni · VEI max. 38060 BCE8060 BCE8059 BCE8059 BCE8059 BCE

Cronologia dettagliata

  1. 8060 a.C. (±500 anni)VEI 3Stima geologica
    BCE 8060 – In corso
    SE flank (Opal Cone)

Link esterni

⚠ Solo a scopo informativo. Non adatto a situazioni di emergenza.