Deep-water sedimentation on an evolving fault-block: the Braux and St Benoit outcrops of the Grès d'Annot
Mark Tomasso, Hugh D. Sinclair, 2004. "Deep-water sedimentation on an evolving fault-block: the Braux and St Benoit outcrops of the Grès d'Annot", Deep-Water Sedimentation in the Alpine Basin of SE France: New perspectives on the Grès d'Annot and related systems, P. Joseph, S. A. Lomas
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The record of sediment fill contained in sub-basins of the western outcrops of the Grès d'Annot indicates that, throughout the period of deposition of the sandstones, there was very little synsedimentary tectonic activity. However, evidence of syntectonic sedimentation is preserved in the basal portion of the fill of the Annot sub-basin. The lowermost portions of the turbidite infill of the Annot sub-basin crop out around Braux and St Benoit. These outcrops are separated by the St Benoit Fault, which is thought to have developed as a result of sinistral strike-slip movement on the main Rouaine Fault to the south. The St Benoit Fault has a normal offset of up to 400 m to the east. Detailed mapping within the Calcaires Nummulitiques, Marnes Bleues and Grès d'Annot, has led to the recognition of several features that indicate a syntectonic sedimentary evolution for the outcrops. These record a three-phase progressive evolution of the St Benoit Fault through the upper Calcaires Nummulitiques to the lowermost Grès d'Annot. As part of this, there are implications for deposition from turbidity currents on encountering topographic barriers. To our knowledge, this area contains one of the few outcrop examples of half-graben formation within the confined basins of the Grès d'Annot.
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Deep-Water Sedimentation in the Alpine Basin of SE France: New perspectives on the Grès d'Annot and related systems
The Grès d′Annot Formation of SE France constitutes a classic and outstanding example of a sand-rich turbidite system controlled by synsedimentary tectonics, and has often been used as an outcrop analogue for deep-water hydrocarbon reservoirs. Over the last 10 years, research efforts by different academic and industrial teams have led to important reappraisals of prevailing ideas on the Gres d′Annot, particularly on the nature and controlling factors of the depositional processes, the small-scale architecture and sequence organization of the deposits, the tectonic regime of the basin and its impact on palaeogeography, and the interaction between sediment gravity flows and basin-floor topography.
This volume offers a multidisciplinary overview and draws up the ′state-of-the-art′ of scientific knowledge on this influential turbidite system. Complementary aspects are covered, from structural geology, sedimentology and sequence stratigraphy, to modelling of sedimentary processes and architectures, geochemistry, reservoir characterization, seismic modelling and uses as analogues for deep-marine hydrocarbon fields.
This book will be of use to both academic researchers (geologists and geophysicists) and industry professionals dealing with the characterization and modelling of deep-water sediments.