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CALC-ALKALINE GRANITE [1 record]

Record 1 2001-04-12

English

Subject field(s)
  • Geochemistry
  • Petrography
CONT

... most of the Pan-African calc-alkaline granites originate from reworked Archean to Paleoproterozoic basement, and ... are rather formed by partial melting of the lower crust, than during an Andean-type magmatic arc.

OBS

calc-alkali granite: By analogy with "calc-alkali feldspar" (see record).

OBS

See record "calc-alkali."

French

Domaine(s)
  • Géochimie
  • Pétrographie
CONT

Les granites calco-alcalins, symptomatiques des croûtes continentales (le rouge agressif des cartes géologiques synthétiques) cristallisent, depuis les 2,5 milliards d'années au moins que fonctionnerait la tectonique des plaques [...], dans le tréfonds des zones de subduction. Ils constituent l'aboutissement d'une physico-chimie complexe des bains silicatés, la différenciation des magmas, dont le point de départ est la fusion partielle hydratée des péridotites de la lithosphère, parfois de la base de la croûte continentale, au-dessus du plan de subduction.

Spanish

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