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Bulletin de la Societe Geologique de France; May 2007; v. 178; no. 3; p. 231-243; DOI: 10.2113/gssgfbull.178.3.231
© 2007 Societe Geologique de France
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Age and environmental evolution of the syn-rift fill of the southern coast of the gulf of Corinth (Akrata-Derveni region, Greece)

Sébastien Rohais1,2, Sébastien Joannin3, Jean-Paul Colin4, Jean-Pierre Suc3, François Guillocheau1 and Rémi Eschard2

1 Geosciences-Rennes, UMR 6118, Université de Rennes 1, Campus de Beaulieu, 35042 Rennes cedex
2 IFP, Division Géologie – Géochimie, 1–4 avenue de Bois Préau, 92852 Rueil-Malmaison, France
3 UMR CNRS 5125 Paléoenvironnements & Paléobiosphère, Université Claude Bernard – Lyon 1, 27-43 Bd du 11 Novembre, 69622 Villeurbanne cedex, France
4 3 Impasse des Biroulayres, 33610 Cestas

The southern coast of the gulf of Corinth exhibits syn-rift deposits, giving insights into the first stages of continental extension as well as the geodynamic evolution of the surrounding Aegean region. The stratigraphy (relative position, 3D geometry, dating) of these deposits is still subject to controversies. The syn-rift evolution of the central part of the southern coast of the Corinth rift is revisited, based on new sedimentological and paleontological data. While ostracods analysis provides precise information about the paleoenvironments, recent advances in palynology supply a more accurate chronology.

For the first time, we document marine evidences and Pleistocene evidences below the well-known giant Gilbert-type fan deltas of the Corinth rift. The syn-rift fill records a three-phase history: (1) the Lower Group corresponds to continental to lacustrine environments passing up progressively to brackish environments with occasionally marine incursions from before 1.8 Ma to some time after 1.5 Ma, (2) the Middle Group corresponds to giant alluvial fans and to Gilbert-type fan deltas prograding in an alternating marine and lacustrine environment from around 1.5 Ma to some time after 0.7 Ma, and (3) the Upper Group corresponds to slope deposits, Gilbert-type fan deltas and marine terraces indicating the emergence of syn-rift sediments along the southern coast from at least 0.4 Ma to the present day, with alternating marine and lacustrine deposition controlled by the position of the Mediterranean sea level relative to the Rion Strait sill.

Key Words: Sedimentology • Palynology • Ostracod • Pleistocene • Corinth Rift • Greece






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