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Salt tectonics driven by sediment progradation: Part I—Mechanics and kinematics

¹ Bureau of Economic Geology, University of Texas at Austin, Austin, Texas; present address: Université de Lille 1, UFR Sciences de la Terre, UMR 8110, Cité Scientifique, Bat. SN5, Villeneuve d'Ascq F-59655, France; bruno.vendeville{at}univ-lille1.fr

Bruno C. Vendeville received his Ph.D. from the Université de Rennes, France, in 1987. After a postdoctoral stay in 1988 and 1989 at the Center for Tectonophysics, Texas A&M University, he worked at the Bureau of Economic Geology at the University of Texas at Austin for 15 years. Since 2004, Bruno has been a professor at the Université des Sciences et Technologies de Lille 1 in northern France. Bruno's research topics include salt and shale tectonics as well as experimental tectonic modeling of other tectonic and gravitational processes at various scales.

Using conceptual reasoning and results from physical models, we describe the mechanical and kinematic characteristics of sediment wedges spreading seaward above a viscous evaporitic layer. Spreading can occur if the distal sediment overburden is thin and weak, or if it comprises preexisting salt bodies. Spreading is accommodated by proximal extension and an associated rise of diapiric ridges, by midslope seaward translation, and by distal shortening. Rapid sediment progradation can lead to the reactivation of older distal folds by later extension. Either retrogradation or renewed sedimentation following a long depositional hiatus can reactivate older grabens and diapirs in shortening.

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