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La stratigraphie tertiaire et la surface d'érosion messinienne sur les marges occidentales de la mer Noire: stratigraphie sismique haute résolution

Abstract : The Tertiary paleogeographic evolution of the Black Sea, within the paratethys realm, was characterised by several periodic isolation episodes. The eutatic responses of the Black Sea to these de-connexions, and particularly those related to the Mediterranean Messinian crisis, are still not clearly established. The high resolution seismic stratigraphy study we present is based on interpretation of multichanel HR seismic data correlated with drillings recovered on the occidental Black Sea margin. Our investigations were concentrated on the identification of erosional surfaces, interpreted as markers of eustatic falls, linked to the basin isolation phases. On the Romano-Ukrainian shelf, the seismic profiles display six major discontinuities regarded as Tertiary erosional surfaces : (1) the surfaces underlined at the base of the Eocene (E), at the base of the Oligocene (O), in the Middle Miocene (M) and at the base of the Pontian (P); (2) and two intra-Pontian erosional unconformities (L.IPU and IPU). On the other hand, the Messinian erosional surface was clearly identified on the Bulgaro-Turckish margin. Recent correlation between the Paratethysian and Mediterranean stratigraphic scale suggest that the IPU surface recognised on the Romano-Ukrainian shelf is equivalent to the Messinian erosional surface. Among the five ante-Messinian erosional surfaces described, we interpret the M surface as the signature of a catastrophic sea level fall related to the Upper Burdigalian isolation phase. We propose that the four other surfaces correspond either to submarine erosion episodes, or to transgressive events. The discovery of the Messinian erosional surface in Black Sea constituting the major result of this study, enables to validate the assomption about the Messinian Dessiccation of the Black Sea [Hsü and Giovanoli, 1979].
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Contributor : Hervé Gillet <>
Submitted on : Monday, February 28, 2005 - 1:03:24 PM
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Hervé Gillet. La stratigraphie tertiaire et la surface d'érosion messinienne sur les marges occidentales de la mer Noire: stratigraphie sismique haute résolution. Géologie appliquée. Université de Bretagne occidentale - Brest, 2004. Français. ⟨tel-00008594⟩

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