TERMIUM Plus®

The Government of Canada’s terminology and linguistic data bank.

ACIDIC ROCK [1 record]

Record 1 2011-06-14

English

Subject field(s)
  • Petrography
  • Geochemistry
DEF

An igneous rock that contains more than 60% SiO2.

CONT

The most common hosts are acid plutonic rocks of the granite clan ranging from adamellite through granodiorite to tonalite.

OBS

acidite: Collective name for all igneous rocks high in silica (65-70% SiO2 by weight.

French

Domaine(s)
  • Pétrographie
  • Géochimie
DEF

[...] roche éruptive contenant plus de 65 % de silice [...]

CONT

Les bassins pauvres en carbonate (granite, silice, roches métamorphiques, roches acides, gneiss) amènent des eaux de surface douces à faible pouvoir tampon.

OBS

La notion d'acidité, quelque peu ambiguë pour les roches, a été introduite au milieu du siècle dernier par Élie de Beaumont qui, en fonction de la teneur en SiO2 distingue les roches acides [plus de 65 %], les roches intermédiaires [entre 52 et 65 %], les roches basiques [entre 45 et 52 %] et les roches ultra-basiques [moins de 45 %].

PHR

Roche éruptive acide.

PHR

Roche magmatique acide.

Spanish

Campo(s) temático(s)
  • Petrografía
  • Geoquímica
DEF

Roca que posee más de un 60% de SiO2, en la que hay sílice libre además de la que forma parte de los silicatos.

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