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Geological Society, London, Special Publications; 2004; v. 221; p. 241-265;
DOI: 10.1144/GSL.SP.2004.221.01.13
© 2004 Geological Society of London

Synsedimentary Tectonics

Syndepositional faulting in the Grès d'Annot Formation, SE France: high-resolution kinematic analysis and stratigraphic response to growth faulting

Renaud Bouroullec1,*, Joe A. Cartwright1,{dagger}, Howard D. Johnson1, Christophe Lansigu2,{ddagger}, Jean-Marie Quémener2 & Dominique Savanier2

1 T. H. Huxley School of Environment, Earth Sciences and Engineering, Royal School of Mines, Imperial College of Science, Technology & Medicine, Prince Consort Road, London SW7 2BP, UKrenaud{at}emarc.colorado.edu
2 Geosciences Rennes, Rennes University, Bat 15, Campus de Beaulieu, 35042 Rennes Cedex, France
* Energy and Mineral Applied Research Center, Department of Geological Sciences CB 399, University of Colorado, Boulder, Colorado 80302-0399, USA
{dagger} Cardiff University, P.O. Box 914, Cardiff CF1 3YE, UK
{ddagger} Geologis, Le Bourg, 63450, France

The presence of syndepositional reservoir scale faulting in the Grès d'Annot Formation adds an additional level of complexity in understanding the stratigraphic architecture of these, and potentially other, deep-water reservoir successions. A series of five synsedimentary faults have been characterized in relation to the high-resolution depositional framework of the Annot deep-water sandstone, faults that were active at the time of deposition of the Grès d'Annot, influencing both stratigraphic architecture and depositional processes. The five faults have normal throw, strike NE-SW (perpendicular to the regional palaeocurrent direction), and have maximum syndepositional throws of between 5 and 30m (sub-seismic-resolution scale). To understand the nature of the synsedimentary faulting, a high-resolution stratigraphic framework was developed from six vertical sedimentary sections measured along the 600m high cliff face, and from detailed correlations along photomosaic panels. Ten lithofacies have been identified and grouped into three different architectural elements that have been used as reference units for the high-resolution kinematic analysis. Syndepositional deformation of these architectural elements indicates that the faults had a polycyclic kinematic behaviour. In the hanging wall, abrupt pinchout of sandstone bodies and unusual local variations in sandstone texture also support the influence of faulting during deposition.





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C. Lansigu and R. Bouroullec
Staircase normal fault geometry in the Gres d'Annot (SE France)
Geological Society, London, Special Publications, 2004; 221: 223 - 240.
[Abstract] [PDF]