Terraforming : the key role of subduction systems
Abstract:
This manuscript presents my research in two main areas: the magmatic processes involved in the formation of the continental crust, and the volatile cycle in subduction zones. My initial work focused on magmatism in the context of an island arc, in particular the Kohistan-Ladakh arc, and helped to constrain the evolution of the deep crust. I then explored the magmatic and metamorphic processes of the slab using numerical models and in a European post-collisional context. More recently, my research has focused on the behaviour of volatile elements – particularly carbon – in a subduction context. Through the study of stable isotopes (Fe, Zn, C and O), I have analyzed the role of fluids and redox processes on carbon mobility and speciation. Field data (Alps) and models reveal how serpentinites and sediments control the transfer of carbon to the mantle. My work combines petrology, geochemistry and modelling. My future projects focus on CO₂ mobility and magmatic processes in the Himalayas and the Massif Central.
Jury:
Rapporteur:
Mme, Marguerite Godard DR-CNRS Univ-Montpellier
M., Jonathan Blundy; Prof.; University of Oxford
M., Peter Kelemen ; Prof. ; Lamont-Doherty Observatory
Examinateur:
M., Jean Marc Montel, Prof. ; univ-lorraine
M., Stephane Guillot ; DR CNRS Université Grenoble Alpes
Mme, Estelle Koga DR CNRS Univ Orléans