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POLYPHASE METAMORPHISM [2 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2011-06-03

English

Subject field(s)
  • Petrography
DEF

[A] polyphase or multiple metamorphism whereby two or more successive metamorphic events have left their imprint upon the same rocks.

OBS

Metamorphism can be ... classified on the basis of different criteria such as ... whether it resulted from a single or multiple event(s), that is, monometamorphism and polymetamorphism.

OBS

In practice, it may be a difficult matter to differentiate polyphase metamorphism from polymetamorphism.

OBS

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

Key term(s)
  • poly-metamorphism

French

Domaine(s)
  • Pétrographie
DEF

Superposition de plusieurs phases métamorphiques.

CONT

Le polymétamorphisme se traduit [...] par une minéralogie complexe et très particulière et par une géochimie inusuelle, rassemblant des éléments qui ne se rencontrent pas ensemble dans les minéralisations dont l'histoire géologique est plus simple [...]

CONT

Les polymétamorphismes comportant une phase rétrograde sont généralement incomplets, c'est-à-dire qu'ils présentent des témoins non rétromorphosés du fait d'une quantité insuffisante d'eau.

OBS

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

Spanish

Save record 1

Record 2 2011-02-15

English

Subject field(s)
  • Petrography
OBS

... the changes in P-T [pressure-temperature] conditions during a metamorphic event do not necessarily involve only one phase of heating and then cooling and/or one phase of increasing then decreasing pressure. Thus a metamorphic event may be monophase(e. g. with one thermal climax...) or polyphase(with two or more climaxes...). Polymetamorphism [may] show two monophase metamorphic events... and two polyphase events..., which have left their imprints on a rock body.... In practice it may be a difficult matter to differentiate polyphase metamorphism from polymetamorphism.

OBS

polyphase metamorphism : term used at Natural Resources Canada-Earth Sciences Sector.

Key term(s)
  • multiphased metamorphism
  • multiphase metamorphism

French

Domaine(s)
  • Pétrographie
CONT

Le métamorphisme est généralement polyphasé. On remarque presque toujours, dans les séries métamorphiques, plusieurs phases de cristallisations superposées; ces séries sont dites «polyphasées».

CONT

Cet outil [d'étude géologique] doit permettre l'établissement d'une chronologie des différentes phases de métamorphisme ayant affecté une roche, qu'il s'agisse d'un métamorphisme polyphasé ou de plusieurs épisodes métamorphiques (polymétamorphisme).

Spanish

Save record 2

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