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A'KF DIAGRAM [1 record]

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Record 1 2003-12-11

English

Subject field(s)
  • Petrography
  • Statistical Graphs and Diagrams
DEF

A triangular diagram showing the chemical character of a metamorphic rock in which the three components plotted are A = Al2O3 + Fe2O3 + (CaO + Na2O, K = K2O, and F = FeO + MgO + MnO.

French

Domaine(s)
  • Pétrographie
  • Diagrammes et graphiques (Statistique)
CONT

Pour les roches magmatiques, les roches métamorphiques, et leurs minéraux, on utilise communément : [...] le diagramme A'KF avec ; A' = (Al2O3 + Fe2O2 - (Na2O+ K2O + CaO'), où CaO' représente le calcium lié aux silicates; K = K2O; F = MgO + MnO + FeO.

CONT

Dans le diagramme A'.F.K., le sommet A' représente la fraction alumineuse qui n'est liée ni à Na-K ni au calcium des silicates (CaO') alors que le sommet K est K2O et qu'en F restent les ferromagnésiens.

Spanish

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