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The influence of syndepositional basin floor deformation on the geometry of turbiditic sandstones: a reinterpretation of the Côte de l’Âne area (Sanguinière–Restefonds sub-basin, Grès d'Annot, Late Eocene, France)

By
Olivier Broucke
Olivier Broucke
1
Géosciences-Rennes, UMR CNRS 6118
Université de Rennes 1, 35042 Rennes, France
olivier.broucke@univ-rennes1.fr
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;
François Guillocheau
François Guillocheau
1
Géosciences-Rennes, UMR CNRS 6118
Université de Rennes 1, 35042 Rennes, France
olivier.broucke@univ-rennes1.fr
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;
Cécile Robin
Cécile Robin
2
Université Pierre et Marie Curie (Paris VI)
FRE 2400, 75252 Paris Cedex 05, France
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;
Philippe Joseph
Philippe Joseph
3
Institut Français du Pétrole
1-4 avenue de Bois-Préau, 92506 Rueil-Malmaison, France
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;
Sylvain Calassou
Sylvain Calassou
4
TotalFinaElf, CSTJF
avenue Larribau, 64018 Pau Cedex, France
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Published:
January 01, 2004

Abstract

The Côte de l’Âne section has been previously interpreted as shallow marine deposits (deltaic system with delta-front to bay head and back-barrier environments). The purpose of this article is (1) to suggest a reinterpretation of these facies of the Grès d'Annot in this area as deep marine deposits and (2) to discuss the effect of an evolving seafloor topography during sedimentation on the stacking pattern of turbiditic deposits. The facies analysis of the sedimentary succession is based on eight measured sedimentological logs and on the visual correlation of identified surfaces. Detailed sedimentological observations permitted the identification of a turbidite facies spectrum, schematized in nine facies associations. Outcrop-scale analysis highlights a downstream thickening of the sedimentary sequence resulting from a strong control by tectonic deformation. This deformation is mainly a flexure with a half-wavelength longer than 500m. Associated normal faults may be related to a gravity slide of unconsolidated sediments accommodated within the flexure. Finally, detailed correlations based on the genetic unit model in the Restefonds-Sanguinière system establish the effect of an evolving seafloor topography during sedimentation on the stacking pattern of turbiditic deposits.

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Geological Society, London, Special Publications

Deep-Water Sedimentation in the Alpine Basin of SE France: New perspectives on the Grès d'Annot and related systems

P. Joseph
P. Joseph
Institut Français du Pétrole, France
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S. A. Lomas
S. A. Lomas
Baker Atlas Geoscience, UK
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Geological Society of London
Volume
221
ISBN electronic:
9781862394698
Publication date:
January 01, 2004

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