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DACITE BRECCIA [1 record]

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Record 1 2011-12-12

English

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

Very fine grained to microcrystalline possibly ash undergoing later brecciation.

CONT

Before stepping on the bridge look very carefully at the rocks. This rock is called a breccia (a rock that consists of fragments of one or more older rock types). This rock is made up of lots of light green fragments surrounded by a darker green, fine-grained material (matrix). It has formed as a result of explosive volcanic activity. In this case, the light green fragments consist of a volcanic rock known as dacite (fine-grained quartz and feldspar) so the rock is called a dacite breccia.

OBS

dacite breccia: term used at Natural Resources Canada - Earth Sciences Sector.

French

Domaine(s)
  • Pétrographie
  • Volcanologie et sismologie
CONT

Avant de prendre pied sur la passerelle, observer les roches attentivement. Cette roche est appelée brèche (une roche composée de fragments d'un ou de plusieurs types de roche plus anciens). À cet endroit la brèche se compose de nombreux fragments vert pâle entourés d'un matériau à grains fins vert plus foncé (la matrice). Elle doit sa formation à une activité volcanique de natureexplosive. Dans ce cas, les fragments vert pâle sont d'une rochevolcanique appelée dacite (quartz et feldspath à grains fins) etcette roche est ainsi appelée brèche dacitique.

OBS

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

Spanish

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