A normal fault geometry is observed in the sediments of the Grès d'Annot Formation. The sediments are deep-water siliciclastic deposits composed of mud-rich and sand-rich successions. This seismic-to sub-seismic scale fault system is considered as a good analogue for syntectonic basin infilling. The outcropping Grès d'Annot Formation allows small-to large-scale fault analysis coupled with stratigraphic analysis. The major faults, which have throws ranging from a few metres to hundreds of metres, belong to a tilted block succession. The mud-rich and sand-rich beds thickness range from a few centimetres to tens of metres. The characterization of the fault system and the kinematic analysis carried out show strong correlation between fault geometry and lithological discontinuities. The fault geometry is largely controlled by the rheological coupling between the mud-rich and sand-rich succession. Downdip displacement of fault blocks is accommodated by layer-parallel movement. Graben structures and synthetic fault sets are related to small-scale fault steps. The fault zone characteristics are related to these fault profile heterogeneities. Kinematic analysis of this fault system provides tools for the characterization of stress field perturbation in a multi-layer system and its consequences in terms of strain localization and hydrodynamic behaviour.
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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.