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Petroleum Geoscience; July 2003; v. 9; no. 3; p. 221-232; DOI: 10.1144/1354-079302-551
© 2003 Geological Society of London
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Original Article

Syn-sedimentary shear zones

I. Moretti1, S. Calassou2, P. Victor1,3, M. Molinaro4 and L. Maerten1

1 Institut Français du Pétrole, Div Géologie-Géochimie, Av de Bois Préau, 92852 Rueil Malmaison, France(e-mail: isabelle.moretti@ifp.fr)
2 TotalFinaElf, Centre Scientifique et Technique JF, 64000 Pau, France
3 Present address: University of Hannover, Institut für Geologie und Paläontologie, Callinstr. 30, D-30167 Hannover, Germany
4 University of Orsay, Laboratoire Tectonique et Bassins, Université Paris Sud, UMR 8616, 91405 Orsay, France

In deltaic and turbiditic deposits along passive margins, such as the Lower Congo basin on the West African margin, the main deformation is not induced by a regional tectonic stress field but by the increase of the sedimentary load leading to gravitational instabilities. The local stress field in such an environment is drastically influenced by the lithological discontinuities, which can reorientate the principal stresses induced by sedimentary loading. In this paper we document the localization of particular faults, called sedimentary shear zones (SSZ); these are formed along the borders of a sandy channel embedded in more fine-grained sediments, as a function of the lithological contrast. Furthermore we describe the reorientation of the stress field, perpendicular to the channel borders in the channel interior. Examples from 3D seismic lines and field studies in SW Ireland and Tunisia are compared with results from analogue and geomechanical models, leading to an integrated interpretation for the formation of the SSZ.

KEYWORDS: channel, turbidite, gravity gliding, stress orientation






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