TERMIUM Plus®

The Government of Canada’s terminology and linguistic data bank.

PETROGRAPHIC FACIES [2 records]

Record 1 2016-02-29

English

Subject field(s)
  • Petrography
DEF

Facies distinguished primarily on the basis of appearance or composition without respect to form, boundaries, or mutual relations ... They consist of actual large bodies of rock occurring in certain areas and in more or less restricted parts of the stratigraphic section ..., or they may consist of all rocks of a single kind ...

French

Domaine(s)
  • Pétrographie
CONT

La dénomination des types peut se faire d'une manière géographique : exemple, pour le minerai de fer : «type Lorraine», ou mieux par une dénomination minéralogique ou géologique [...] par exemple : «Type oxydo-carbonaté oolithique dans des séries transgressives gréseuses», pour le gisement de manganèse de Tchiatoura [...] Cette dénomination [...] permet d'associer un type de minéral (oxydo-carbonaté) à un faciès pétrographique déterminé (oolithique).

CONT

Séquence argileuse.- En supposant l'argile formée essentiellement de kaolinite, silicate hydraté d'alumine [...], le premier faciès pétrographique obtenu est celui de l'argilite, ou schiste argileux [...]

Spanish

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Record 2 2011-12-21

English

Subject field(s)
  • Petrography
CONT

Recent petrographic studies suggest an earlier HP–LT [high-pressure, low-temperature] stage(white schist facies) only preserved in garnet …

OBS

whiteschist: A fairly unusual metamorphic rock which contains talc and garnet and other minerals. It is very high in magnesium compared to other sorts of metamorphic rocks (which is part of why it contains talc) and its garnet tends to be higher in Mg [magnesium] than is normal for garnets in metapelites. It is thought to form under rather high pressure.

OBS

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

Key term(s)
  • facies of whiteschists
  • facies of white schists

French

Domaine(s)
  • Pétrographie
CONT

Le faciès des schistes blancs (Chopin, 1984) se caractérise par l'association talc + disthène (équivalent à plus faible pression à la chlorite magnésienne). La coésite, polymorphe de haute pression de la silice, est connue dans certaines paragenèses, ce qui suppose des pressions supérieures à 25 kb [kilobars].

Spanish

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