Facies architecture of the Grès de Peïra Cava, SE France: Landward stacking patterns in ponded turbiditic basins

Lawrence A. Amy, Benjamin C. Kneller, William D. McCaffrey

    Research output: Contribution to journalArticle

    43 Citations (Scopus)

    Abstract

    Basins in which turbidity currents are completely or partially trapped are common in many tectonically active, deep-water settings. Field study of an Eocene-Oligocene turbiditic system in the Peïra Cava area, a sub-basin of the Alpine foreland in southeastern France, allows spatial characterization of a ponded basin fill on the basis of a correlation framework derived from measured outcrop sections and photomosaics. The basin-fill architecture comprises a sand-rich, proximal scour-and-fill facies and a downstream transition to mud-rich, basin-plain turbidite sheet facies. The proximal facies is interpreted to have formed directly downstream of a slope break, where currents were highly erosional during some periods and highly depositional during other periods, as a result of the interacting effects of turbulence enhancement and rapid deceleration. Both the proximal facies and the downstream transition to distal basin-plain facies occur in progressively landward positions at higher stratigraphic levels. The landward shift in depositional facies is likely to have resulted from the basin-floor aggradation and a landward migration of the slope break. This 'back-stepping' process may be expected to occur in many ponded turbiditic basins and to produce a similar type of sedimentary architecture.

    Original languageEnglish
    Pages (from-to)143-162
    Number of pages20
    JournalJournal of the Geological Society
    Volume164
    Issue number1
    DOIs
    Publication statusPublished - Jan 2007

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