PhD student

Subject

Geochemical tracers of fluid-rock interactions in exhumed mantle domains: a comprehensive study of serpentinization processes, from field to experiments

Begining and end of the contract

October 2018 - October 2021

Supervisors :

  • Marc Ulrich, EOST - IPGS, University of Strasbourg
  • Manuel Munoz, Geosciences Montpellier
  • Damien Lemarchand - LHyGeS, University of Strasbourg

Project description

This project proposes to investigate the role of fluid systems related to the exhumation of mantle rocks and serpentinization in deep water rifted margins. The aim of the project is to (1) understand when, where and how fluids interacted with mantle rocks, (2) characterize the nature and chemical signatures of these fluids and related mass fluxes, and (3) determine the conditions of reactions, in particular the temperature of mantle fluid-rock interactions.

The results will significantly improve the understanding of the fluid circulations in magma-poor rifted margins. In particular, the more precise determination of the temperature of serpentinization is fundamental in order to characterize the thermal regime during mantle exhumation at distal rifted margins, a key parameter that is still poorly constrained.

Keywords

exhumed mantle, serpentinization, B-Li isotopes, geothermometer, experimental geochemistry

Conferences

- Goldschmidt 2019 : Geochemical tracers of fluid-rock interactions in exhumed mantle domains: a comprehensive study of serpentinization processes. (Poster) Flora Hochscheid, Marc Ulrich, Manuel Munoz, Damien Lemarchand and Gianreto Manatschal

Master Thesis

Incipient magmatism during ridge-to-subduction transition: Evidences from the New-Caledonia ophiolite