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EXPANSION BASSINS ARRIERE-ARC [1 record]

Record 1 2011-01-05

English

Subject field(s)
  • Tectonics
DEF

The process of creating new oceanic crust in the back-arc area behind a subduction trench.

CONT

Because the new axis of spreading developed behind the subduction trench, the newly created oceanic crust is said to have resulted from back-arc spreading. It is noteworthy here that the newly formed oceanic crust was younger than most of the ocean-floor sediments that were being subducted nearby.

CONT

The islands of Japan were separated from mainland Asia by back-arc spreading.

OBS

back-arc spreading: term used at Natural Resources Canada - Earth Sciences Sector.

Key term(s)
  • backarc spreading
  • back arc spreading

French

Domaine(s)
  • Tectonique
CONT

Si l'ensemble des zones de subduction répond bien à la loi, on observe une certaine dispersion pour les arcs des Nouvelles-Hébrides, des Mariannes et du Japon. L'erreur commise sur la vitesse de subduction qui ne tient pas compte de l'expansion arrière-arc dans le cas des Nouvelles-Hébrides et des Mariannes n'est peut-être pas étrangère à cette dispersion.

CONT

Dans ces zones que l'on appelle centres d'expansion des bassins d'arrière-arc, le magma monte à proximité de la surface aux marges de convergence qui se forment lorsqu'une plaque tectonique se glisse sous une autre selon un phénomène appelé subduction.

OBS

déplacement de l'arrière-arc : terme en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.

Key term(s)
  • expansion de bassin d'arrière-arc

Spanish

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