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Abstract

The application of the sequence stratigraphy concepts to mixed carbonate-siliciclastic platforms and adjacent basins is of great interest in reconstructing the paleogeographic evolution of pericratonic domains. The Cenomanian-Turonian stages of Provence are well adapted to this application because the connection between the platform and the basin is preserved, thus leading to accurate facies and lithostratigraphic correlations. Moreover, both the paleogeographic setting of carbonate platforms and the source of siliciclastics can be determined. Biostratigraphic data based on ammonites, rudists, planktonic and benthic foraminifers, allows high resolution chronostratigraphic dating and correlation from the basin to the platform. Two detailed sections have been described as typical of the regional stratigraphical series: one for the basinal area, another for the carbonate platform. Sedimentology, biostratigraphy and sequence stratigraphy, lead to distinguish five third order sequences and their correlative systems tracts encompassing the Early Cenomanian-Middle Turonian time.

Distribution of facies and evolution of paleoenvironments are analysed with respect to relative sea-level changes. The amplitude of sea-level changes at the 3rd-order scale has been estimated by the method by Vail et al. (1977).

Sequence boundaries are of several types: tectonically enhanced, or controlled by eustasy. Two tectonically induced 2nd order regressive-transgressive cycles have been identified. The second one, from Middle Cenomanian to Middle Turonian time displays a succession of phases (forestepping, aggrading, backstepping) that compare well to those described by Jacquin et al. (1992) for the Middle Jurassic Paris Basin.

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