Scale effects of non-uniformity on deposition from turbidity currents with reference to the Grès d'Annot of SE France
Published:January 01, 2004
W. D. McCaffrey, B. C. Kneller, 2004. "Scale effects of non-uniformity on deposition from turbidity currents with reference to the Grès d'Annot of SE France", Deep-Water Sedimentation in the Alpine Basin of SE France: New perspectives on the Grès d'Annot and related systems, P. Joseph, S. A. Lomas
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Turbidity current non-uniformity arises when flows experience changes in slope or degree of confinement. The phenomenon may operate across a range of scales with respect to flow size, to produce a range of characteristic depositional effects. Non-uniforrnity effects at three scales can be inferred within the Grès d'Annot exposed around the town of Annot. At the basinal scale, the very presence of sedimentary deposits may reflect a non-uniformity control. At the inferred flow scale, non-uniformity effects upon facies development can be linked to particular system geometries, for example channels or scours versus sheet systems. At the smallest scale, detailed facies heterogeneity may be linked to variability in the local sea floor topography. In poorly-exposed or subsurface systems, recognition of these effects may allow the non-uniformity regime of the parental flows to be constrained and hence permit improved prediction of the first order of sedimentary architecture away from point s of control.
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Deep-Water Sedimentation in the Alpine Basin of SE France: New perspectives on the Grès d'Annot and related systems
The Grès d′Annot Formation of SE France constitutes a classic and outstanding example of a sand-rich turbidite system controlled by synsedimentary tectonics, and has often been used as an outcrop analogue for deep-water hydrocarbon reservoirs. Over the last 10 years, research efforts by different academic and industrial teams have led to important reappraisals of prevailing ideas on the Gres d′Annot, particularly on the nature and controlling factors of the depositional processes, the small-scale architecture and sequence organization of the deposits, the tectonic regime of the basin and its impact on palaeogeography, and the interaction between sediment gravity flows and basin-floor topography.
This volume offers a multidisciplinary overview and draws up the ′state-of-the-art′ of scientific knowledge on this influential turbidite system. Complementary aspects are covered, from structural geology, sedimentology and sequence stratigraphy, to modelling of sedimentary processes and architectures, geochemistry, reservoir characterization, seismic modelling and uses as analogues for deep-marine hydrocarbon fields.
This book will be of use to both academic researchers (geologists and geophysicists) and industry professionals dealing with the characterization and modelling of deep-water sediments.