Reference : UMR7327-MARROU0-025
Workplace : ORLEANS
Date of publication : Wednesday, June 15, 2022
Scientific Responsible name : GAILLARD Fabrice
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 1 October 2022
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly
Description of the thesis topic
Electromobility (on-board batteries) is being used today, and for many more years, by lithium-based battery technologies. For the growth of the European battery manufacturing, it is therefore imperative to discover and increase lithium resources in Europe. Due to a long geological history marked by numerous orogens, lithium deposits are numerous in Europe, which shows a true potential of discovery. These are mainly observed as rare-metal granites and pegmatites (Li-Cs-Ta-Sn). However, these small intrusions are undetectable at depth by the geophysical techniques. It is therefore critical to understand ore forming processes related to these rare metals magmas in order to establish effective ore targeting. Research carried out by the BRGM and within the framework of the BRGM-ISTO UMR as well as more recent international publications tend more and more to associate the genesis of these magmas with the partial melting of lithium-rich metasediments rather than to the end of crystallization of parental granites. To validate this hypothesis, this thesis aims to demonstrate this hypothesis in the laboratory by the experimental low-partial melting of natural samples of hyperaluminous metasediments.
The objective of the PhD is to identify the reaction path conducive to Li-Nb-Ta rich granitic melts. In order to do so, experimental petrology will be used to simulate crustal melting in the laboratory. A thorough geochemical work on metamorphic rocks will also be needed. The results will be shared with a consortium of researchers who are involved in the TRANSFAIR project (ie. Nancy, Paris, Toulouse & Chambéry).
ISTO is a laboratory equipped with outstanding facilities in experimental petrology and micro-analytic tools. The candidate will have access to all these facilities.
: ISTO (https://www.isto-orleans.en/) is a laboratory supported by three national entities (university of Orléans-CNRS-BRGM). The PhD candidate will follow the rules of the Research school at Orléans (https://www.univ-orleans.fr/fr/univ/recherche/ecoles-doctorales/ed-552-energie-materiaux-sciences-de-la-terre-et-de-lunivers-emstu). The daily work will be supervised by a scientific et technical group: the MAGMA group and the Experimental platform.
Constraints and risks
High-pressure and high-temperature experiments are planned. The candidate will be trained to the safety issues.
In order to apply, the candidate must hold a MASTER degree. The ability to work and collaborate in a group of people are important. A CV and an application letter must be submitted.
The candidate must have a good expertise in three of the following fields:
- Good knowledge of the petrology of magmatic rocks
- Good knowledge of the petrology of metamorphic rocks
- Experience in experimental petrology
- Experience in chemical characterization of solid samples (crystals and glasses)
- Experience in thermodynamic calculations on phase equilibria in metamorphic/magmatic rocks
- Good level in both written and spoken English
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