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COMPOSITIONAL LAYERING [1 record]

Record 1 2009-04-21

English

Subject field(s)
  • Petrography
CONT

... variations in crystallisation can be manifest by layering defined by alternations of different composition (different minerals). The general term "compositional banding" is used to describe the layering.

CONT

... thin plate-shaped minerals, such as mica, align perpendicular to the direction of maximum pressure, giving rise to a layering in the rock that is known as foliation. Compositional layering, or bands of different minerals, can also occur and cause foliation.

OBS

[Term used for] igneous or metamorphic rocks ... when the origin or significance of the layering is uncertain.

OBS

compositional layering: term used at Natural Resources Canada - Earth Sciences Sector.

French

Domaine(s)
  • Pétrographie
CONT

foliation : Structure visible dans certaines roches métamorphiques où, à la schistosité, s'ajoute une différenciation pétrographique entre les lits formant ainsi des feuillets.

OBS

différenciation pétrographique; stratification pétrographique : termes en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.

Spanish

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