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Geological Society, London, Special Publications; 2004; v. 221; p. 181-202;
DOI: 10.1144/GSL.SP.2004.221.01.10
© 2004 Geological Society of London

High Resolution Sequence Stratigraphy and Depositional Model

Genetic units/parasequences of the Annot turbidite system, SE France

François Guillocheau1, Jean-Marie Quéméner1,{dagger}, Cécile Robin2, Philippe Joseph3 & Olivier Broucke1

1 Géosciences-Rennes, UMR 6118, Université de Rennes 1, 35042 Rennes, Francefrancois.guillocheau{at}univ-rennes1.fr
2 Université Pierre et Marie Curie (Paris VI), FRE 2400, 75252 Paris Cedex 05, France
3 IFP, 1-4 avenue de Bois-Préau, 92506 Rueil Malmaison, France

High-frequency cycles (genetic units or parasequences), with a mean duration of 20000 years, have been identified in the Grè d’Annot turbidite system of the southern Alpine foreland basin (Late Eocene/Early Oligocene). They filled a narrow (2–8 km wide) synsedimentary syncline that formed a confined basin fed upward by a fan-delta located on a narrow shelf. These cycles are 10m thick, and each consists of a basal heterolithic component and an upper sandy homolithic unit, traceable over at least 10 km. They result from the superposition of (1) a progradational phase with an accretionary system (low-angle accretionary bedsets) and a feeder system (by-pass to high preservation oblique laminasets) and (2) an aggradational phase with a ‘spread’ system overlain by a condensed interval. The progradational phase shows very low-angle clinoforms (low-angle accretionary sets, 1–2 m high, a few tens to a few hundreds of metres long) fed by erosional structures (channels or large scours, 0.2–2 m deep, a few metres to a few tens of metres wide). The aggradational phase (subplanar laminasets, ‘scour and fill’ structures) forms a ramp, and drapes the underlying sediments. These progradational geometries may be explained by the narrow sub-basin morphology and by the transition from channelled flow (updip narrow part) to unconfined flow (downdip wider part). These genetic units directly record the variations in sedimentation rate of the feeding fan-delta on the shelf, which are controlled by the 20 000 year cycles of sea-level change.





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