Stratigraphy of two conjugate margins (Gulf of Lion andWest Sardinia): modeling of vertical movements and sediment budgets

International audience; The post-rift (20-0 Ma) vertical movements of the Provence Basin (West Mediterranean) are quantified on itsboth conjugate (the Gulf of Lion and the West Sardinia) margins. This work is based on the stratigraphic studyof sedimentary markers using a large 3D grid of seismic data, correlations with existing drillings and refractiondata. The post-rift subsidence is measured by the direct use of sedimentary geometries analysed in 3D [Gorini etal., 2015; Rabineau et al., 2014] and validated by numerical stratigraphic modelling. Three domains were found:on the platform (1) and slope (2), the subsidence takes the form of a seaward tilting with different amplitudes,whereas the deep basin (3) subsides purely vertically [Leroux et al., 2015a]. These domains correspond to thedeeper crustal domains respectively highlighted by wide angle seismic data. The continental crust (1) and thethinned continental crust (2) are tilted, whereas the intermediate crust, identified as lower continental exhumedcrust [Moulin et al., 2015, Afhilado et al., 2015] (3) sagged. The post-break-up subsidence re-uses the initial hingelines of the rifting phase. This striking correlation between surface geologic processes and deep earth dynamicprocesses emphasizes that the sedimentary record and sedimentary markers is a window into deep geodynamicprocesses and dynamic topography.Pliocene-Pleistocene seismic markers enabled high resolution quantification of sediment budgets over the past6 Myr [Leroux et al., in press]. Sediment budget history is here completed on the Miocene interval. Thus, thecontrolling factors (climate, tectonics and eustasy) are discussed.Afilhado, A., Moulin, M., Aslanian, D., Schnürle, P., Klingelhoefer, F., Nouzé, H., Rabineau, M., Leroux,E. & Beslier, M.-O. (2015). Deep crustal structure across a young 1 passive margin from wide-angle and reflectionseismic data (The SARDINIA Experiment) - II. Sardinia’s margin. Bull. Soc. géol. France, 186, ILP Spec. issue,4-5, 331-351.Gorini, C., Montadert, L., Rabineau, M., (2015) New imaging of the salinity crisis: Dual Messinian lowstandmegasequences recorded in the deep basin of both the eastern and western Mediterranean, Marine and PetroleumGeology (2015), doi: 10.1016/j.marpetgeo.2015.01.009.Leroux, E., Aslanian, D., Rabineau, M., Moulin, M., Granjeon, D., Gorini C. & Droz, L. (2015a). Sedimentarymarkers in the Provençal basin (Western Mediterranean): a window into deep geodynamic processes. Terra Nova,27(2), 122-129.Leroux, E., Rabineau, M., Aslanian, D., Gorini, C., Molliex, S., Bache, F., Robin, C., Droz, L., Moulin, M.,Poort, J., Rubino, J.-L. & Suc, J.P. (2016, in press). High resolution evolution of terrigenous sediment yieldsin the Provence Basin during the last 6 Ma: relation with climate and tectonic. Basin Research, xx, xx-xx (ID:4759575-1545130).Moulin, M., Klingelhoefer, F., Afiladho, A., Aslanian, D., Schnürle, P., Nouze, H., Beslier, M.-O. & Feld, A.(2015). Deep crustal structure across an young passive margin from wide-angle and reflection seismic data (TheSARDINIA Experiment) - I. Gulf of Lion’s margin, Bull. Soc. géol. France., 186, ILP Spec. issue, 4-5,309-330.Rabineau, M., Leroux, E., Aslanian, D., Bache, F., Gorini, C., Moulin, M., Molliex, S., Droz, L., Reis, T. D.,Rubino, J.-L., Guillocheau, F. & Olivet, J.-L. (2014). Quantifying subsidence and isostatic readjustment usingsedimentary markers (example in the Gulf of Lion). Earth and Planetary Science Letters, 388, 1-14