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Bellot-Coignus_NinaMs. Nina Bellot

Function: Doctoral research fellow

Participation in ClerVolc program N°: 5

Main Research Unit: LMV



I am a ClerVolc PHD student at the Laboratoire Magmas et Volcans (LMV) in Clermont-Ferrand. I started a PHD in September 2012 after obtaining my Master 2 « Magmas et Volcans » at the University Blaise Pascal in Clermont-Ferrand. I am working in the field of geochemistry, under the supervision of Maud BOYET and Christian PIN. During my PHD I’m studying the La-Ce isotopic system, from the chemistry to the analysis of the Cerium isotopes. We are developing a method to measure them as oxides on the Thermo ionisation mass spectrometer in the LMV. We are applying our new method to different types of rocks particularly arc lavas from the Lesser Antilles, but also on other kinds of rocks to acquire a large amount of isotopic data on Ce. I have knowledge of working in a clean room, and different methods of chemical element separation and isotopic dilution. Because of the significant differences in abundances of the Ce isotopes (136Ce = 0,18 % ; 138Ce = 0,25% ; 140Ce = 88,43% ; 142Ce = 11,13%) the measurements are difficult and we are working on having the best reproducibility and the lowest errors. The study of this isotopic system (la-Ce) will give a new tool to better constrain the isotopic composition of rocks combined with the Sm-Nd system.

Research Topics

Composition of the magmas, origin and magmatic processes. Behaviour of the REE in the Earth’s Mantle, development of a new geochemical method, geochemistry of lavas in subduction zones and technical development of TIMS.


  • Bellot-Coignus N., Boyet M., Doucelance R., Pin C., Savov, Plank, Elliott, (2015). Cerium isotope systematics in the Mariana arc-basin system. Goldschmidt conference, Prague.

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