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OCEAN-FLOOR METAMORPHISM [1 record]

Record 1 2006-11-15

English

Subject field(s)
  • Geology
  • Oceanography
CONT

Ocean-floor metamorphism is a type of metamorphism of regional or local extent related to the steep geothermal gradient occurring near spreading centres in oceanic environments. The recrystallisation, which is mostly incomplete, encompasses a wide range of temperatures. The metamorphism is associated with circulating hot aqueous fluids (with related metasomatism) and typically shows an increasing temperature of metamorphism with depth.

CONT

During extension at mid-ocean ridges (red-orange), convection carries heat to very shallow levels, where 7-km thick oceanic crust forms; hydrothermal circulation produces low P/T metamorphism, often called seafloor metamorphism: Many good examples of seafloor metamorphism are known from ophiolites in the Sierra Nevada and Klamaths.

OBS

ocean-floor metamorphism; sea floor metamorphism: terms used at Natural Resources Canada - Earth Sciences Sector.

French

Domaine(s)
  • Géologie
  • Océanographie
OBS

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

Spanish

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