--> Abstract: 3D Structural Control of Turbidite Deposition in a Foreland Fold and Thrust Belt: The Annot Sandstone Depocentre of Sanguinière, SE France; #90063 (2007)
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3D Structural Control of Turbidite Deposition in a Foreland Fold and Thrust Belt: The Annot Sandstone Depocentre of Sanguinière, SE France

 

Salles, Lise1, Mary Ford2, Antoine LeSolleuz3, Philippe Joseph4, Christian Le Carlier de Veslud5 (1) Previous HitNancyNext Hit School of Geology, France, Vandoeuvre lès Previous HitNancyNext Hit, France (2) Previous HitNancyNext Hit School of Geology, France, France (3) G2R, Previous HitNancyNext Hit School of Geology, Previous HitNancyNext Hit, France, France (4) Institut Francais du Petrole, 92852 Rueil Malmaison Cedex, France (5) Previous HitNancyTop School of Geology,

 

The Annot Sandstone is a well-known analog for sand-rich deep-water reservoirs. The succession was deposited in a deltaic setting over period of 10My from the Bartonian to Rupelian, in the active alpine foreland basin. Today the Annot Sandstone is superbly exposed in the subalpine mountain chains of SE France. Detailed sedimentologic and stratigraphic studies have been published on the Annot Sandstone, however, structural controls on turbidite deposition are not yet well constrained. A new field-based structural study is used to construct a 3D geometrical model (gOcad) of the Sanguinière depocentre, the northernmost Annot sub-basin. This is one of the best-known turbidite depocentres and is generally believed to have developed above a growing syncline. However, our work on the timing, kinematics and geometry of principal faults and folds suggests that N-S normal faults played an important role in early depocentre evolution. 3D coherence of throw across fault planes for different stratigraphic reference horizons is used to test the viability of field-based interpretations of growth faulting and folding. The modelled horizons correspond to the base of the Tertiary basin fill (base of Nummulitic Limestone), the base of the Annot Sandstone itself and three key horizons within the Annot Sandstone. The timing and role of folding is studied from derived isopach maps. The 3D model can therefore constrain components of deformation due to faulting and folding and thus clarify the interaction of turbidites with active structures in a foreland setting.

 

AAPG Search and Discover Article #90063©2007 AAPG Annual Convention, Long Beach, California