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Interaction tectonique-sédimentation dans le rift de Corinthe, Grèce. Architecture stratigraphique et sédimentologie du Gilbert-delta de Kerinitis.

Abstract : Synrift stratigraphy on a normal fault block is subdivided into three groups. The Lower group is composed of continental sediments (fluvio-lacustrine). The Middle group contains the giant Gilbert-type fan deltas and their associated fine-grained facies. The Upper group is composed of the recent to present day Gilbert-deltas and superficial deposits. The Lower group is marked by a low subsidence rate on the young Pirgaki fault and some secondary faults. A marked increase in subsidence rate mark the transition to the Middle group. It is proposed that the increase in subsidence rate is due to the connexion between two major faults. The Upper group was deposited during uplift of the study area in the footwall of the Helike fault. It is suggested that the giant Kerinitis Gilbert-type fan delta was deposited during the Early to early Middle Pleistocene, under marine conditions. Facies characterizing a range of depositional processes are assigned to four facies associations: topset, foreset, bottomset and prodelta. The stratal architecture is composed of eleven Key Stratal Surfaces (KSS) separating eleven Stratal Units (SU). In this subsidence-dominated system, each SU records a highstand period and principally a period of decreasing eustatic sea level. The KSS, record transgressions that took place in periods of rapid sea level rise. The eustatic signal, controlling the deposition of the SU is of higher frequency than the tectonic signal, which controlled four stages of delta growth. The four delta growth stages are linked with the initiation, maximum growth and the abrupt death of the Pirgaki-Kerinitis fault system.
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https://tel.archives-ouvertes.fr/tel-00457060
Contributor : Nicolas Backert <>
Submitted on : Tuesday, February 16, 2010 - 3:12:49 PM
Last modification on : Thursday, May 28, 2020 - 3:10:07 PM
Long-term archiving on: : Friday, June 18, 2010 - 6:05:41 PM

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  • HAL Id : tel-00457060, version 1

Citation

Nicolas Backert. Interaction tectonique-sédimentation dans le rift de Corinthe, Grèce. Architecture stratigraphique et sédimentologie du Gilbert-delta de Kerinitis.. Géologie appliquée. Institut National Polytechnique de Lorraine - INPL, 2009. Français. ⟨tel-00457060⟩

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