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SEQUENCE PROGRADANTE [1 record]

Record 1 2008-10-10

English

Subject field(s)
  • Tectonics
CONT

Forestepping sequences near the end of the regression are bounded by tectonically enhanced unconformities and form large lowstand systems tracts with progradational offlap at the platform margin.

CONT

... it is known that at the Southern North Sea coast retrogradational sequences are generally represented by a sequence of peat covered by brackish and marine deposits. Progradational sequences are generally represented by a sequence of marine and brackish deposits covered by peat.

OBS

forestepping sequence: term used at Natural Resources Canada - Earth Sciences Sector.

Key term(s)
  • fore-stepping sequence

French

Domaine(s)
  • Tectonique
CONT

Séquences progradantes. - Dans les milieux peu profonds, la progradation affiche l'installation et la généralisation des milieux proximaux, développés en phase ultime de la remontée marine. La séquence de type B [...] révèle une organisation stratocroissante et granocroissante, typique d'une séquence de comblement. Leur empilement marque un comblement progressif du milieu et une tendance nette à la progradation. La séquence de type C [...] montre une évolution régressive bathydécroissante, caractérisée par la succession de petites séquences paragénétiques, qui s'exprime par une stratodécroissance et une granodécroissance, dont chacune débute par des wackestones noduleux à encrines et brachiopodes [...] et se termine par des grainstones pseudonoduleux à encrines [...]

OBS

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

Spanish

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