Chronostratigraphy, palaeogeography and sequence stratigraphy
2004. "Chronostratigraphy, palaeogeography and sequence stratigraphy", 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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New sedimentological and biostratigraphical data on the Annot sub-basin (southern Alps, France) provide a good overview of a fore-deep basin infill with well-known Annot turbiditic complex. This basin shows a total thickness of more than 1100 m, where the Grès d'Annot exceeds 500m with well-longitudinal and transversal outcrops. Our study is to define a chronostratigraphical framework, which allows comparisons of local signatures of sea-level fluctuations with eustatic curve, and also identification of tectonic effects. The Annot succession could be interpreted as a second-order cycle. We identify a deepening and transgressive Priabonian interval, represented by the transition from platform of the Calcaires Nummulitiques to hemipelagic marls of the Marnes Bleues where tectonic subsidence rate outpaces third-order eustatic fluctuations and sedimentary influx. Priabonian to early Rupelian Annot turbidites progressively appear with a thickening-and coarsening-upward stacking pattern of four different sand-rich turbiditic systems with lobes, megaslide, channelized lobes and erosional/depositional channel. Each prograding system is separated by an erosive surface corresponding to a third sequence boundary. A possible sequence stratigraphy interpretation may be modelled as a forced regression during foreland basin closure, where the upper turbiditic systems correspond to lowstand prograding complexes from basin floor fan to proximal slope fan.
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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.