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BACK-STEPPING SEQUENCE [1 record]

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Record 1 2011-01-05

English

Subject field(s)
  • Tectonics
CONT

Backstepping sequences in the latest stage of the transgression are characterized by depositional environments that backstep due to the increasing rate of creation of accommodation space. Shelf-members of these sequences show mainly high-energy facies. Backstepping sequences thin upward to a surface of drowning (drowning unconformity), which corresponds to the maximum flooding surface of the last well-developed sequence.

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

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

Key term(s)
  • retro-gradational sequence
  • retro-grading sequence

French

Domaine(s)
  • Tectonique
CONT

Séquences rétrogradantes. - Caractéristiques des termes pélitiques déposés lors des périodes transgressives, ces séquences de type A [...] sont généralement non modales, rarement bimodales; leur organisation interne est stratodécroissante et granodécroissante, à évolution transgressive «Deepening up».

CONT

Séries charbonneuses dans des séquences rétrogradantes : cas du bassin houiller paralique westphalien de Jérada (Maroc).

OBS

S'oppose à «séquence progradante».

OBS

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

Key term(s)
  • séquence rétro-gradante

Spanish

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