Post doc position (24 months) - Mineralogy and geochronologyUnderstanding processes and time scales in ancient terrestrial and extraterrestrial (phosphate) materials through nanoscale investigations.

Context:

This post doc is part of a wider project COSMO-SAT (P.I. A.-M. Seydoux-Guillaume, Co-P.I. F. Vurpillot and M. Roskosz) from the PEPR Origins (https://pepr-origins.fr/en/). The objective of COSMO-SAT is to develop a new generation of tomographic atom probe dedicated to the analysis of terrestrial and extraterrestrial geological samples in order to significantly improve their quantitative and isotopic measurements at the nanometric scale. Measuring quantitatively the elemental and isotopic composition of samples, down to the atomic scale, allows to trace and quantify the irradiation processes and the gas-grain interactions in the protoplanetary disk, to determine the origin of pre-solar grains and their associated nucleosynthesis, as well as the origin of primitive complex objects. The project has several ambitious instrumental improvement objectives (https://pepr-origins.fr/en/projet/cosmo-sat/) to tackle various questions. One concerns extraterrestrial nano-geochronology and the understanding of complex samples from the Archean to the Hadean through isotopic analysis of very small volumes of chronometric minerals (zircons, baddeleyites, phosphates, etc.), and the study of processes at the nanoscale. This will be at the centre of the present Post doc.

More details here: https://lgltpe.fr/postdoctoral-position-in-mineralogy-geochronology/

Application:

Interested candidates should send a short CV before July 15th, 2026 (including the list of articles/communications) + a letter of motivation + at least one letter of recommendation, by email to anne.magali.seydoux @ univ-st-etienne.fr (anne.magali.seydoux @ univ-st-etienne.fr)

Starting date: November 2026 (flexible over a few months). Participation in the atom probe school in Rouen (early November 2026) is mandatory.

Working places:

The present postdoctoral project will be mostly based at LGL-TPE in Saint-Etienne (https://lgltpe.fr/) in a completely new building on the manufacture campus of the University Jean Monnet (https://lgltpe.fr/inauguration-du-batiment-sciences-manufacture-de-lujm/) with Anne-Magali Seydoux-Guillaume (FIB/TEM developments). Significant time will be spent at Groupe de Physique des Matériaux (GPM) in Rouen (https://gpm.univ-rouen.fr/) where the COSMO-SAT APT is hosted. Regular visits to Laboratoire Magmas et Volcans in Clermont-Ferrand (https://lmv.uca.fr/) are also planned, mainly for scientific meetings with partner researchers specialized in primitive earth and Mars geochemistry and geochronology (Martin Guitreau and Maud Boyet).