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OVERTHRUST ZONE [3 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2011-12-22

English

Subject field(s)
  • Plate Tectonics
CONT

Ampferer (A) subduction is when the continental crust plunges, as opposed to Benioff (B) subduction where it is the ocean crust that subducts.

CONT

A-subduction.-The movement of one continental lithospheric plate under another(subduction) in a collision zone, with the separation of part or all of the upper crust from the lower crust and mantle. The denser material subducts normally whilst the buoyant material can underthrust or overthrust the crust of the overriding plate. A-subduction, named after O. Ampferer, has also been called "delamination, "and is contrasted with B-subduction, named after Hugo Benioff, in which oceanic lithosphere subducts. A-subduction is postulated to involve shortening of a maximum of only a few hundred kilometres, whereas B-subduction can recycle thousands of kilometres of oceanic crust and upper mantle.

OBS

Ampferer subduction; A subduction: terms used at Natural Resources Canada - Earth Sciences Sector.

Key term(s)
  • Ampferer type subduction

French

Domaine(s)
  • Tectonique des plaques
CONT

[...] l'ensemble des métamorphismes et du magmatisme en question doit être interprété comme lié à une subduction de type A, c'est-à-dire à la subduction continentale d'une partie de la lithosphère européenne sous les zones alpines, la zone de subduction elle-même correspondant au bassin de la molasse [...] qui contient jusqu'à 6 km de sédiments détritiques.

OBS

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

Spanish

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Record 2 2009-07-22

English

Subject field(s)
  • Tectonics
DEF

A geologic formation in the Rockies where pieces of the earth’s crust rode up over other layers and trapped what may be oil-bearing sedimentary deposits.

OBS

overthrust belt; thrust belt; thust zone : terms used at Natural Resources Canada-Earth Sciences Sector.

Key term(s)
  • over-thrust belt
  • over thrust belt
  • over-thrust zone
  • over thrust zone

French

Domaine(s)
  • Tectonique
DEF

Grande ligne de contact anormal des formations fortement plissées du Montana à l'Arizona.

OBS

zone de chevauchement; zone de charriage : termes en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.

Spanish

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Record 3 2009-03-13

English

Subject field(s)
  • Tectonics
OBS

The term "root" is commonly used apropos of nappe. However, it is also one of the most difficult terms to define objectively. The root is the zone from which a nappe arises, but according to the idea formed of the kinetics of the overthrust, it may correspond to different dispositions, such as a continuous passage to a normal sedimentary cover or a vertical plunge to great depth.

OBS

root: term used at Natural Resources Canada - Earth Sciences Secteur.

French

Domaine(s)
  • Tectonique
OBS

Le terme «racine» est un des plus employés à propos des nappes, et un de ceux dont il est le plus difficile de donner une définition objective. La racine est la région par laquelle une nappe se rattache aux terrains en place, non chevauchants, mais suivant l'idée que l'on se fait de la cinématique du chevauchement, elle peut correspondre à des dispositions différentes : passage continu à une couverture sédimentaire normale, plongée à la verticale en profondeur, etc.

OBS

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

Spanish

Save record 3

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