Nous aurons le plaisir d’accueillir Pierre Maffre le jeudi 23 octobre à 10h30 au 2ème étage du bâtiment 504 pour un séminaire intitulé : “Uplift episodes in Earth history: various consequences on ocean-atmosphere geochemistry and climate”.
Résumé : Continental uplift is known to have had profound consequences on Earth climate, either modifying atmospheric and oceanic dynamics by the generation of topography, or disturbing geochemical cycles by rock exhumation, weathering, erosion and sedimentation. Several aspects of these interactions have been hypothesized for more than a century. Yet, up to now, new chains of processes are still suggested regarding how continental uplift may have affected the evolution of climate: CO2 drawdown by silicate weathering, emitted by oxidative weathering or buried in form of organic carbon. Here I will present several examples of documented or hypothetical uplift episodes in the Neogene, Cretaceous and Carboniferous, having contrasted impacts on the Earth system, and different imprints in geochemical proxy records.
