13/02 Séminaires Généraux: Heleen Vanneste (ENSAT/Ecolab, Université de Toulouse)
de 16:00 à 17:00
|S'adresser à||Francis Albarède, Isabelle Daniel|
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Seepage of Hydrocarbon Bearing Fluids at the Carlos Ribeiro and Darwin Mud Volcanoes (Gulf of Cadiz): A Geochemical Approach.
Submarine mud volcanoes are dynamic features that episodically expel gas-charged fluids and mud onto the seafloor, transferring various chemical constituents into the overlying water column. After decennia of research spatial and temporal variation in mud volcano activity is still poorly understood and so their importance as a source of methane and other elements to oceanic chemical budgets cannot be properly constrained.
In this talk, I will present the results of a detailed study addressing this gap in our knowledge. Fluid, chemical fluxes and mudflow activity are assessed at two mud volcanoes, Carlos Ribeiro and Darwin, located in the Gulf of Cadiz (NE Atlantic). Analyses of the chemical composition of pore fluids, sediments and authigenic carbonates are combined with 1-D transport-reaction pore fluid modelling.
Francis Albarède, Isabelle Daniel
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