Informations générales
Intitulé de l'offre : M/F Postdoc on investigation of physical-chemical conditions controlling the Hadean zircon crystallization and survival (H/F)
Référence : UMR5563-ANABOR-011
Nombre de Postes : 1
Lieu de travail : TOULOUSE
Date de publication : samedi 25 octobre 2025
Type de contrat : Chercheur en contrat CDD
Durée du contrat : 12 mois
Date d'embauche prévue : 1 janvier 2026
Quotité de travail : Complet
Rémunération : between €2,991 and €3,417 gross monthly depending on experience
Niveau d'études souhaité : Doctorat
Expérience souhaitée : Indifférent
Section(s) CN : 18 - Terre et planètes telluriques : structure, histoire, modèles
Missions
The Post Doc will work on zircon-melt equilibrium elemental partitioning at relatively low (≤900°C) temperatures in contrast to most available high-temperature partitioning (≥ 900°C) extrapolated to low-temperature processes (600°C). The experimental zircon/melt partitioning for trace elements, P-S-in-zircon sensors, Al-Ti-in-zircon and the zircon-hosted inclusion proxy to be established for the wide range of geologically relevant systems at controlled run duration(t)-P-T-fO2-aH2O. These experimental constraints will allow building novel geochemical and geodynamic models linking the shallow felsic crust production, segregation with mantle-crust differentiation and planetary geodynamics and habitability.
Activités
Experience using piston cylinder and DAC presses, high-temperature and high-pressure experiments, numerical modeling, Zr isotopes, atomic-scale and micro-scale analyses.
Compétences
Experience in solid materials physics, experiments using piston-cylinder and DAC presses, high-temperature and high-pressure experiments, numerical modeling, Zr isotopes, atomic-scale and micro-scale analyses..
Contexte de travail
Global geochemical fluxes via the planetary geodynamics, rock-forming reactions, transformations and movements over 4.5 Gyr link the planetary interior with the surface. The understanding of these links is largely conditioned by the use of mineral proxies among which zircon, ZrSiO4 has been holding the first place. The understanding is especially important for the Hadean eon, > 4 Ga, because no Hadean rock but uniquely zircon grain record was preserved. Zircon is silicate mineral which is the host of a plethora of elemental and isotopic tracers, e.g., Hf, Zr, Si, O, Th, U, Pb, Ti, Sc, Nb, Y, rare earth elements, REE, Cl, F that record the fluid and melt sources, physicochemical conditions, pressure-temperature, P-T, oxygen fugacity-water activity, fO2-aH2O, chronology of the host rock-forming processes and equilibrium versus disequilibrium crystallization. The existing tectono-magmatic systematics of zircons is currently based on two major assumptions of: zircon-melt thermodynamic equilibrium and uniformism of trace element behavior in zircon-melt system.
Contraintes et risques
High-temperature and high-pressure techniques.