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• W1988468415 abstract "Beginning in 1950, oil drilling in Camargue disclosed the existence of the Rhône palaeovalley, filled with 700 m of Pliocene sediments. Data from later drilling, in the Gulf of Lion and up the Durance River valley, permitted a satisfactory reconstruction of the former Messinian valley of the Durance River. This valley shows up as a 300 km long canyon linking the abyssal plains of the Balearic Basin to the Alpine domain. Such a reconstruction requires the cancelling of the tectonic deformations (contemporary or subsequent) which have affected that palaeotopography, nam ely: down-stream subsidence resulting from the sedimentary load and the collapse of the continental shelf, and by up-stream compression warpings, which are very perceptible at the crest of the anticlines (Eyguières and Mirabeau). Keeping in mind these observations, it is possible to produce a satisfactory reconstruction of the longitudinal profile of the canyon. The depth increases from up-stream to down-stream where its value is over 1000 m. Such an extraordinary deepening, as well as the Pliocene filling that has followed, cannot be tectonically controlled because: (1) the excavation is maximum down-stream; and (2) there is evidence for typical oscillatory movement. A eustatic interpretation integrates these two facts because during the Messinian salinity crisis, the Mediterranean Sea was affected by the strongest eustatic oscillation of its history. One knows that in the case of rejuvenation provoked by the subsidence of the base level, erosion proceeds from down-stream to up-stream. The magnitude of the Messinian channel across the continental shelf suggests a depth of about 2000 m before the basin dried up. These observations confirm the evidence that only the desiccated deep basin model is able to explain coherently the whole of the phenomena linked to the salinity crisis. A l'aide de sondages profonds implantés à terre et en mer et de levers détaillés de surface, on parvient à restituer le profil longitudinal du canyon messinien de la Durance sur une longueur de 300 km. L'âge de son creusement est calé stratigraphiquement aussi bien à l'amount qu'à l'aval. Le facteur tectonique n'est pas à l'origine de ce phénomène géodynamique car, aulieu de le précéder dans le temps, il lui fait suite. Dans les secteurs où il est intervenu, on s'est efforcé d'apprécier son rôle afin de neutraliser son incidence dans la reconstitution rétrograde qui est présentée. Ces précautions étant prises, il apparaît que les ruptures de pente du profil longitudinal du canyon reflètent les données lithologiques et structurales de son substratum et que l'ampleur du creusement diminue d'aval en amont. La dynamique du creusement procède donc d'un extraordinaire effondrement du niveau de base qui ne peut être appréhendé qu'indirectement, par ses incidences paléogéographiques. Celles-ci sont les plus prononcées au droit de la marge messinienne. A ce niveau, l'ampleur du creusement atteint (et sans doute dépasse) le millier de mètres, si l'on prend en compte la tranche de terrain érodée sur les interfluves. Ceci implique, pour les plaines abyssales, un abaissement du niveau de base de l'ordre de 1500 m. Compte tenu de la réponse isostatique à la décharge hydraulique lors de la crise de salinité messinienne, cela implique, pour le bassin pré-évaporitique, une profondeur de l'ordre de 2000 m." @default.
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• W1988468415 date "1979-01-01" @default.
• W1988468415 modified "2023-10-17" @default.
• W1988468415 title "Le canyon messinien de la Durance (Provence, France): Une preuve paléogéographique du bassin profond de dessiccation" @default.
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• W1988468415 doi "https://doi.org/10.1016/0031-0182(79)90073-7" @default.
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