Discovery of Messinian canyons and new seismic stratigraphic model, offshore Provence (SE France): Implications for the hydrographic network reconstruction

The interpretation of high-resolution 2D marine seismic profiles together with the analysis of sea-bottom cores allowed a stratigraphic and structural framework of the Provence continental shelf to be proposed. The integration of onshore and offshore stratigraphy, structure and geomorphology provide...

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Bibliographic Details
Published in:	Marine and petroleum geology Vol. 57; pp. 25 - 50
Main Authors:	Tassy, A., Fournier, F., Munch, P., Borgomano, J., Thinon, I., Fabri, M.-C., Rabineau, M., Arfib, B., Begot, J., Beslier, M.-O., Cornée, J.-J., Fournillon, A., Gorini, C., Guennoc, P., Léonide, P., Oudet, J., Paquet, F., Sage, F., Toullec, R.
Format:	Journal Article
Language:	English
Published:	Kidlington Elsevier Ltd 01-11-2014 Elsevier
Subjects:	Applied geophysics Base Plio-Quaternary surface Earth Sciences Earth, ocean, space Exact sciences and technology Geological mapping Geomorphology Internal geophysics Karst Offshore seismic data Provence continental shelf Sciences of the Universe Shallow coring Stratigraphy Submarine canyon Western Mediterranean Provence France Mediterranean Sea West Mediterranean Europe Western Europe Shallow coring Western Mediterranean Karst Base Plio-Quaternary surface Offshore seismic data Provence continental shelf Geological mapping Submarine canyon Neogene continental shelf transgression upper Tertiary seismic profiles drill cores currents fluvial erosion Cenozoic unconformities high resolution onshore models maps Quaternary Tertiary Messinian karst Pliocene offshore submarine canyons interpretation upper Miocene drainage Miocene Phanerozoic isobaths
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Summary:	The interpretation of high-resolution 2D marine seismic profiles together with the analysis of sea-bottom cores allowed a stratigraphic and structural framework of the Provence continental shelf to be proposed. The integration of onshore and offshore stratigraphy, structure and geomorphology provided new insights into Messinian paleotopography and paleohydrography. A geological map of the offshore Provence continental shelf, isobath map of the base Plio-Quaternary surface are presented for the first time in this area. The base Plio-Quaternary surface is a polyphased unconformity that is composed of deep canyons developed by fluvial erosion during the Messinian event, and wave-cut surfaces formed during post-Messinian transgressions. The study evidenced a deep, E–W-trending canyon (Bandol canyon) connected to the head of the Cassidaigne canyon, and filled with up to 600 m-thick Plio-Quaternary deposits. The development of canyons on the Provence margin during the Messinian event was dominantly controlled by the lithology and structure of pre-Messinian formations. A map of the Messinian paleo-drainage network is proposed to explain the presence of deep canyons in the Eastern area and the lack of incision in the Western area. An underground karst drainage scheme is proposed, linked with the current submarine Port-Miou spring. •2D seismic profiles and sea-bottom cores are performed on the Provence margin.•Interpretation is based on the integration with the onshore stratigraphy.•Geological map of the continental shelf is provided for the first time in the area.•3D land-sea surface of Messinian paleotopography and paleohydrography is provided.•E–W infilled Messinian canyon has been discovered, connected to Cassidaigne canyon.
ISSN:	0264-8172 1873-4073
DOI:	10.1016/j.marpetgeo.2014.05.001