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BLUESCHIST FACIES [1 record]

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Record 1 2010-07-20

English

Subject field(s)
  • Petrography
DEF

[A] high-pressure, low-temperature metamorphism associated with subduction zones which produces a broad mineral association including glaucophane, actinolite, jadeite, aegirine, lawsonite, and pumpellyite.

OBS

blueschist facies: term used at Natural Resources Canada - Earth Sciences Sector.

Key term(s)
  • blue-schist facies
  • blue schist facies

French

Domaine(s)
  • Pétrographie
CONT

Le faciès des schistes bleus ou schistes à glaucophane (Eskola, 1929) se distingue par la présence d'une amphibole sodique, la glaucophane. La présence de lawsonite et/ou de l'association jadéïte + quartz permettent de définir des sous-faciès. La pumpellyite peut exister dans la partie la moins métamorphique de ce faciès. Les micas blancs ne sont pas des muscovites mais des phengites. La biotite et les feldspaths sont exclus.

OBS

faciès des schistes bleus : terme en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.

Spanish

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