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EXPANSION FONDS OCEANIQUES [1 record]

Record 1 2011-05-02

English

Subject field(s)
  • Plate Tectonics
  • Oceanography
DEF

The mechanism by which new seafloor is created along the rift at the crest of a mid-ocean ridge as adjacent plates move apart.

OBS

The crust separates along the rift, and new seafloor forms as hot new crust upwells into these cracks. The new seafloor spreads laterally away from the rift and is replaced by even newer crust in a continuing process of plate creation.

OBS

seafloor spreading; sea floor spreading: terms used at Natural Resources Canada - Earth Sciences Sector.

French

Domaine(s)
  • Tectonique des plaques
  • Océanographie
DEF

Mécanisme de création de nouveau fond marin le long du rift (fossé d’effondrement) à la crête d’une dorsale médio-océanique alors que des plaques adjacentes s’éloignent l’une de l’autre.

OBS

La croûte se déchire le long du rift et il se forme un nouveau fond marin alors que de nouveaux matériaux de croûte chauds s’élèvent dans les fissures. Le nouveau fond marin s’étale latéralement de part et d’autre du rift et est remplacé par de la croûte encore plus récente dans ce processus ininterrompu de création de plaque.

OBS

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

Spanish

Campo(s) temático(s)
  • Tectónica de placas
  • Oceanografía
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