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ALLOCHTHON [1 record]

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Alphabetical list of terms

Record 1 2008-12-09

English

Subject field(s)
  • Tectonics
DEF

A terrane that has undergone significant motion with respect to the stable craton to which it is accreted.

CONT

allochthonous terrane: ... used in the description of rocks ... formed or produced elsewhere than in its present place.

OBS

"Terrane" is used to describe a fault-bounded tectonic unit of regional extent which possesses a history unlike that of adjacent terranes and is thought to be far-travelled: hence allochthonous, displaced, exotic or suspect terrane. "Terrain" should be employed more generally to describe a region characterized by distinctive geomorphological or geological attributes without implication that it is far-travelled.

OBS

terrane: A formation or group of formations.

OBS

allochthonous terrane; allochthon; exotic terrane; transported terrane; displaced terrane: terms used at Natural Resources Canada - Earth Sciences Sector.

French

Domaine(s)
  • Tectonique
DEF

Terrain déplacé par l'effet d'un processus tectonique.

CONT

Dans le cas du Grenville, les roches de l'allochtone sont des roches métamorphiques qu'on estime s'être formées à au moins une vingtaine de kilomètres sous la surface; des roches donc qui se trouvaient aux racines d'une très haute chaîne de montagnes qu'on estime avoir été aussi haute que l'Himalaya actuel et qui depuis a été passablement érodée (correspondant en gros à nos Laurentides).

OBS

[...] on cherche à faire l'inventaire des différents terranes qui constituent une chaîne de montagnes. [...] Lorsqu'on a trouvé [que le terrane] avait une origine lointaine, il était qualifié d'«exotique» ou d'«allochtone».

OBS

terrane allochtone; allochtone; terrane exotique; terrane déplacé : termes en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.

Spanish

Campo(s) temático(s)
  • Tectónica
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