TERMIUM Plus®

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

PALEOSOME [1 record]

Record 1 2012-04-20

English

Subject field(s)
  • Petrography
  • Mineralogy
DEF

A geometric element of a composite rock or mineral deposit which appears to be older than an associated younger rock element.

CONT

It is usually possible to distinguish the following parts of a migmatite: 1) the"paleosome" i.e., the unaltered or only slightly modified parent or country rock [and] 2) the "neosome" i.e, the newly formed rock portion ...

French

Domaine(s)
  • Pétrographie
  • Minéralogie
DEF

Partie originelle essentiellement invariante dans une roche métamorphisée ou ayant subi un apport.

CONT

[Partie des migmatites], le «paléosome» est la fraction-relique du matériel originel, peu ou pas transformée [...]

CONT

La série des migmatites. [...] La roche est [...] formée d'une trame métamorphique ancienne (le paléosome) plus ou moins perturbée par la cristallisation d'un matériel nouveau de composition granitique issu de la fusion partielle des roches (le néosome).

OBS

Par opposition à «néosome».

Spanish

Campo(s) temático(s)
  • Petrografía
  • Mineralogía
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