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- W1952842796 abstract "[1] In paper 1 we described a methodology to model coupled fluid flow and deformation in composite salt and siliciclastic tectonic systems and investigated their compaction and overpressuring behavior prior to and during continental margin-scale gravitational spreading. Compaction-driven Darcy fluid flow in clastic sediments is coupled through the effective pressure to their frictional-plastic yield and mechanical deformation. Viscous flow of the underlying salt is independent of fluid pressure. Paper 1 presented prototype models that are limited to single uniform sediment lithologies, either sandstone-type or shale-type, that undergo mechanical and volumetric viscous compaction. In this paper we present models with layered sandstone-type and shale-type lithologies designed to better approximate the more complex stratigraphy of the Gulf of Mexico, our natural example. A first set of models demonstrates that layered lithologies can produce fluid pressure regimes similar to those observed in sedimentary basins. We then introduce an improved formulation of viscous compaction that includes a stronger dependence on porosity and depth (used as proxy for temperature), thereby more effectively self-limiting viscous compaction. A second set of models with the improved viscous compaction formulation demonstrates that the onset of gravity spreading is mainly controlled by overpressuring in the landward end of the salt basin and that resulting shortening in the distal part is partly accommodated by horizontal compaction. Models with moderately high fluid pressure best reproduce conditions considered to have been necessary for large-scale gravitational spreading in the northwestern Gulf of Mexico, which led to the formation of the Perdido Fold Belt." @default.
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- W1952842796 date "2012-07-26" @default.
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- W1952842796 title "Coupled fluid flow and sediment deformation in margin-scale salt-tectonic systems: 2. Layered sediment models and application to the northwestern Gulf of Mexico" @default.
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- W1952842796 doi "https://doi.org/10.1029/2011tc003035" @default.
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