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Découverte de la surface d’érosion messinienne onshore/offshore dans deux lieux clés : le Promontoire Baléares (Ibiza) et la marge est-sarde (Orosei) ArchiMer
Maillard, Agnès; Gaullier, Virginie; Lézin, Carine; Chanier, Frank; Odonne, Francis; Lofi, Johanna.
As the Messinian sea-level draw down associated with the Messinian Salinity Crisis is still questioned, we propose to show that the widely spread erosion surface affecting the Mediterranean margins is indeed linked to an exondation demonstrated from offshore and onshore data. Our study presents a comprehensive onshore to offshore correlation of the Messinian erosional surface. It is focused on small drainage systems or interfluve areas, outside of evaporite basins or incised canyons, where the Messinian erosion had not yet been studied previously: around Ibiza on the Balearic Promontory and around Orosei on the Eastern Sardinian margin, Tyrrhenian Basin, both areas where new offshore data were recently acquired. We show that the late Messinian erosion...
Tipo: Text Palavras-chave: Crise de salinité messinienne; Méditerranée nord-occidentale; Surface d' Érosion; Ibiza; Marge est-sarde; Messinian Salinity Crisis (MSC); Northwestern Mediterranean; Erosion surface; Ibiza; Eastern Sardinian margin.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00622/73392/72608.pdf
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Post-rift evolution of the Gulf of Lion margin tested by stratigraphic modelling ArchiMer
Leroux, Estelle; Rabineau, Marina; Aslanian, Daniel; Gorini, Christian; Bache, Francois; Moulin, Maryline; Pellen, Romain; Granjeon, Didier; Rubino, Jean-loup.
The sedimentary architecture of basins and passive margins is determined by a complex interaction of parameters, including subsidence, eustasy, and sediment supply. A quantification of the post-rift (20 Ma-0 Ma) vertical movements of the Gulf of Lion (West Mediterranean) is proposed here based on the stratigraphic study of sedimentary paleomarkers using a large 3D grid of reflection seismic data, correlations with existing drillings, and refraction data. Post-rift subsidence was measured by the direct use of sedimentary geometries analysed in 3D and validated by numerical stratigraphic modelling. Three domains of subsidence were found: on the continental shelf and slope, subsidence corresponds to a seaward tilting with different amplitudes, whereas the...
Tipo: Text Palavras-chave: Modélisations stratigraphiques; Stratigraphie sismique; Golfe du Lion; Post-Rift subsidence; Crise de salinité messinienne; Processus profonds et superficiels; Stratigraphic modelling; Seismic stratigraphy; Gulf of Lion; Post-rift subsidence; Messinian salinity crisis; Deep and surface processes.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00283/39421/37903.pdf
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