TERMIUM Plus®

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MEDIO-SILICIC ROCK [1 record]

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Alphabetical list of terms

Record 1 2011-01-21

English

Subject field(s)
  • Petrography
  • Geochemistry
DEF

[An] igneous rock whose chemical composition lies between those of basic and acidic rocks ...

OBS

The limits are not fixed rigidly and a number of schemes exist that are based on modal mineralogy and the whole rock chemistry ...

French

Domaine(s)
  • Pétrographie
  • Géochimie
DEF

Roche ignée dont la teneur en silice se situe entre celles des roches acides et basiques.

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 %].

Spanish

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