Semmani N., Fournier F., Suc J. P., Fauquette S., Godeau N., Guihou A., Popescu S. M., Melinte-Dobrinescu M. C., Thomazo C., Marie L., Deschamps Pierre, Borgomano J. (2023). The Paleogene continental basins from SE France : new geographic and climatic insights from an integrated approach. Palaeogeography Palaeoclimatology Palaeoecology, 615, p. 111452 [22 p.]. ISSN 0031-0182.
Titre du document
The Paleogene continental basins from SE France : new geographic and climatic insights from an integrated approach
Année de publication
2023
Auteurs
Semmani N., Fournier F., Suc J. P., Fauquette S., Godeau N., Guihou A., Popescu S. M., Melinte-Dobrinescu M. C., Thomazo C., Marie L., Deschamps Pierre, Borgomano J.
Source
Palaeogeography Palaeoclimatology Palaeoecology, 2023,
615, p. 111452 [22 p.] ISSN 0031-0182
New insights into the geodynamic evolution, the paleogeographic framework and the paleoclimatic setting of the Upper Eocene-Oligocene lacustrine basins from South-East France have been provided by an integrative approach combining geochronology, micropaleontology and stable isotope analyses. U-Pb dating on calcite, pollen-based climatostratigraphy and strontium and sulfur isotope signatures of sulfates provided a robust chronostratigraphic framework for the Upper Eocene and Oligocene succession from the Vistrenque, Ale`s and Roussillon basins. The thick Priabonian- lower Rupelian lacustrine succession from the Vistrenque Basin is interpreted to be deposited in a strike-slip basin associated with the latest stages of pyrenean shortening. Floral assemblages are used to reconstruct the vegetation cover in the lacustrine systems and their neighbouring lowlands and highlands. Composition of saltwater inferred from strontium and sulfur isotope signatures of sulfates, the occurrence of calcareous nannofossils, dinoflagellate cysts and pollen grains of mangrove-related plants provided strong evidence for marine intrusions into the Ale`s Basin during the Priabonian and the Vistrenque Basin during the Rupelian and Chattian. Paleogeographic reconstructions of Southeast France during the Priabonian and late Rupelian strongly suggest marine incursions from the Alpine Sea via two potential pathways: upper Rhone Valley via the Crest Sill and lower Rhone Valley via the Haut-Var Pyrenean synclines. On the other hand, Upper Oligocene evaporite basins in the Camargue area have been subjected to marine intrusions from the Western Mediterranean Sea following the collapse of the eastern pyrenean relief during the Liguro-Provencal rifting stage. Finally, pollen analysis and Climate Amplitude Method revealed a brief but significant stage of cooling and aridification at the very base of the Rupelian which could represent the regional and terrestrial expression of the global climate cooling following the Eocene-Oligocene Transition.
Plan de classement
Sciences du milieu [021]
;
Géologie et formations superficielles [064]
Description Géographique
FRANCE
Localisation
Fonds IRD [F B010087794]
Identifiant IRD
fdi:010087794
