Amaury Bouyon's PhD | INSTITUT DE PHYSIQUE DU GLOBE DE PARIS

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Stable isotope geochemistry

  Amaury Bouyon's PhD

Redox variations as seen through Selenium and Sulfur isotope geochemsitry
Encadrant (et co-encadrant) : 
Résumé: 

My PhD focuses on two main aspects, the isotopic composition of sulfur and the isotopic composition of selenium. The first one is a well-known technique in the lab and can be used to investigate Archean sediments as well as carbonatites. The second one is the subject of a methodological development based on the new high resolution mass spectrometer, the Mat253 Ultra.

 

Mat253 Ultra, in IPGP

 

The samples I am interested in are from the Precambrian of Brazil, from more recent sedimentary rocks with a focus on the organic sulfur fraction,  and from carbonatites which are a special kind of volcanic rocks. The main goal is to define the redox state or the redox evolution of these sytems through time. I am using for this the sulfur multi-isotopic composition, which means the three isotopic ratios of sulfur. Other tools can be carbon or oxygen isotopes.

 

Carbonatite samples.
Date de soutenance: 
Friday 10 December 2021 - 14:00
Jury: 
Fleurice Parat, Maitre de Conférence (Université de Montpellier), Rapportrice Christophe Thomazo, Maitre de Conférence (Université de Bourgogne), Rapporteur Emilie Thomassot, Maitre de Conférence (Université de Lorraine), Examinatrice Catherine Chauvel, Directrice de Recherche CNRS (IPGP), Examinatrice James Farquhar, Professeur (University of Maryland), Examinateur Pierre Cartigny, Directeur de Recherche CNRS (IPGP), Directeur de thèse