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MAGMA DACITIQUE [1 record]

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Record 1 2010-03-02

English

Subject field(s)
  • Petrography
  • Vulcanology and Seismology
CONT

Dacite magma, by slow cooling, becomes granitic plutons which are the major constituent of continental crust and matured island arc crust.

CONT

Mount St. Helens provides a good example of how a volcanic eruption can start and how the style of eruption can vary over time - even though the magma remains chemically similar. ... Steam explosions, some with small amounts of ash, continued intermittently until the catastrophic eruption began at 08:32 ... on 18 May 1980. The gas-rich dacitic magma, instantaneously released by the world's largest observed landslide, exploded in a blast that extended laterally for 32 km and vertically to a height of 25 km.

OBS

dacite magma; dacitic magma: terms used at Natural Resources Canada - Earth Sciences Sector.

French

Domaine(s)
  • Pétrographie
  • Volcanologie et sismologie
CONT

Le Mont Saint Helens est un bon exemple de la manière dont une éruption volcanique peut commencer et dont le style d'éruption peut varier avec le temps - même si le magma reste chimiquement semblable. [...] Des explosions de vapeur, certaines contenant de la cendre, se sont poursuivies par intermittence jusqu'à ce que l'éruption catastrophique débute à 08h32 [...] le 18 mai 1980. Le magma dacitique riche en gaz, qui a été libéré instantanément par le plus grand glissement de terrain jamais observé, a explosé avec une force telle que la déflagration s'est étendue latéralement sur une longueur de 32 km et verticalement sur une hauteur de 25 km.

OBS

magma dacitique : terme en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.

Spanish

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