Expertise

Research Projects

On going collaborative Research Projects

S2S : Sediment provenance studies:

We participate to several academic research projects to determine the geographical origin of sediments in a Source To Sink approach. We use the Sr and Nd isotope compositions of sediments to trace their provenance and study the variability of sedimentary fluxes as a function of forcing parameters such as eustatism or climate during margins and sedimentary basin formation. Our main study field is the Gulf of Lion in the Mediterranean Sea.

MICROPLASTIC (FUI20)

The aim of the Microplastic project is to better understand the origins and fate of microplastic particles within our environment and their impact. Within this vast program SEDISOR will be in charge of establishing new procedures to analyse the chemical compositions and the stable isotope compositions of microplastic particles to identify their origins.

Heavy metals contamination in rivers and lakes

We use lead (Pb) isotopes to study potential pollutions in sediments collected in rivers or lakes. The Pb isotopes compositions of natural rocks are clearly distinctive from industrial materials or gasoil particles. Therefore, Pb isotope analyses can help understanding high Pb concentrations in the environment.

Mantle geochemistry

STORM Oceanographic cruise (R/V L’Atalante, January-February 2015): The South-East Indian Ridge (SEIR) between Australia and Antarctica displays large variations of axial morphology despite an almost constant intermediate spreading rate. The Australia-Antarctic Discordance (AAD) between 120°E and 128°E is a section of the mid-ocean ridge where the magma budget is abnormally low, and which marks the boundary between Indian and Pacific mantle domains with distinct geochemical isotopic compositions. A major objective of the STORM cruise was to test the hypothesis of a mantle flow from the Pacific to the Indian domains. SEDISOR was on board and is involved in the study of collected dredges samples.

Polynesian oceanic crust structure: Within the French Extraplac program (http://www.extraplac.fr) SEDISOR is involved in the petrographic and geochemical study of magmatic samples collected in the Marquesas and Tuamotu areas during the oceanographic cruises POLYPLAC 1 & 2.

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