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PTYGMATIC FOLD [1 record]

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Alphabetical list of terms

Record 1 2011-02-11

English

Subject field(s)
  • Tectonics
DEF

An irregular, lobate fold, usually found where single competent layers are enclosed in a matrix of low competence ...

CONT

In migmatite terrains and other highly mobile environments, layers and veins that make a long angle with a compression direction become buckled in characteristic tight, somewhat irregular, folds called "ptygmatic folds" ...

OBS

ptygmatic fold: term used at Natural Resources Canada - Earth Sciences Sector.

French

Domaine(s)
  • Tectonique
CONT

Généralement, le lit qui servira de témoin [de la déformation] est plus résistant que la roche; [...] s'il y a une compression suivant la direction du lit résistant, il peut se plisser, sans changer de longueur (plis ptygmatiques), et ce plissement met en évidence le rétrécissement.

OBS

pli ptygmatique : terme en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.

Spanish

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