Contribution to the revision of the geological map Aubagne-Marseille (Southeastern France) at the 1/50.000 scale, 3 rd edition: the Oligocene stratigraphical series of the Marseille-Aubagne basin
Contribution à la révision de la carte géologique Aubagne-Marseille à 1/50.000 3e édition: stratigraphie de l'Oligocène du bassin Marseille-Aubagne
Abstract
The establishment of the 3rd edition of the geological map Aubagne-Marseille at 1/50.000 scale, gave us the opportunity to study and map the Oligocene continental series which constitutes the sedimentary filling of the Marseille-Aubagne basin and other smaller neighboring Oligocene basins. Mapping was made at the 1/12.500 scale while detailed lithological sections were logged and sampled for biostratigraphical and sedimentological (microfacies) investigations. A compilation of previous geological field-works and drillings carried out on the Marseille-Aubagne basin since the fundamental work of Depéret (1889) allowed us to provide complementary data on the Oligocene stratigraphy. Our survey led us to establish a stratigraphical subdivision of the Oligocene series different from that proposed by Nury et al. in the 3rd edition of the map and notice Aubagne-Marseille (2018) and closer to the former stratigraphical scheme of Deperet (1889). In particular, thanks to accurate correlations, we develop here the idea that there is only one stratigraphical series with lateral facies variations on the whole of a single Oligocene basin, contrary to the idea supported by Nury et al. of the existence of three stratigraphical series in three independent sub-basins. In conclusion, we present the consequences that our results have on the geodynamical interpretation of the Oligocene basin Marseille-Aubagne.
Origin : Files produced by the author(s)
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