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Géodynamique et impact de la crise d'érosion et de salinité Messinienne sur les transferts sédimentaires (bassin de Valence, bassin Adriatique)

Abstract : The geodynamic evolution of the Mediterranean area, especially in the Valencia and Adriatic basins, is strongly influenced by its ante-Neogene history. The localization of existing thresholds at that time, and their impact on the following tectono- sedimentary evolutions still remain largely unknown. In this work, we will try to reconstruct this evolution and better understand the part of these thresholds, in particular during the Messinian Erosional and Salinity Crisis (MESC, 5.96-5.32 Ma). We provide here a complete view of the Neogene sedimentary infilling for the both Valencia and Adriatic basins thanks to a compilation of seismic profiles correlated to industrial boreholes.Our results allow us to individualize the Valence-Provençal domain into three subbasins whose ages, subsidence and crustal nature differ. A new kinematic and geodynamic scenario for the Valencia and Neogene Algerian basins is proposed here. This segmentation provides also information about MESC. We highlight a fully incised-valley system whose length reaches more than 270 km, the latter associated with the development of several system tracts. Overall, these interpretations lets us look the Ebro basin connection paradox from a different angle.The Mesozoic Apulian-Gargano-Pelagosa composite threshold mainly control the Neogene sedimentation in the Adria domain and distinguishes two main depocenters. The propagating of the Albanid and Apennine deformation fronts control also the evolution of vertical movements and the sedimentation. Our results imply that the Messinian period corresponds to a major tectonic and/or kinematic reorganization phase within which the MSC is a superimposed event.
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https://tel.archives-ouvertes.fr/tel-01651341
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Submitted on : Thursday, January 18, 2018 - 10:24:26 PM
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Romain Pellen. Géodynamique et impact de la crise d'érosion et de salinité Messinienne sur les transferts sédimentaires (bassin de Valence, bassin Adriatique). Sciences de la Terre. Université de Bretagne occidentale - Brest, 2016. Français. ⟨NNT : 2016BRES0041⟩. ⟨tel-01651341⟩

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