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SIENITA CALCOALCALINA [1 record]

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Record 1 2004-12-10

English

Subject field(s)
  • Geochemistry
  • Petrography
DEF

Syenite in which the plagioclase is between oligoclase and andesine in composition.

OBS

Syenites occur in two main types: (1) calc-alkali, "normal," syenites, and (2) alkali syenites.

French

Domaine(s)
  • Géochimie
  • Pétrographie
CONT

La monzonite [...] est une syénite calco-alcaline de composition intermédiaire entre les syénites types et les diorites. Elle contient de l'orthose et de l'andésine en égale quantité, un peu de quartz et d'augite.

CONT

Syénites calco-alcalines, si le plagioclase est de l'oligoclase ou de l'andésine.

CONT

Les roches «exactement saturées en silice» : ce groupe comprend [...] les syénites calco-alcalines [...]

Key term(s)
  • syénite calcoalcaline

Spanish

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

[Sienita] cuya plagioclasa consiste en oligoclasa o andesina; la ortosa le confiere un color rosado.

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