Reference : UMR5563-VALCHA-001
Nombre de Postes : 1
Workplace : TOULOUSE
Date of publication : Thursday, December 15, 2022
Type of Contract : FTC Scientist
Contract Period : 18 months
Expected date of employment : 2 May 2023
Proportion of work : Full time
Remuneration : 2800 - 3000€
Desired level of education : PhD
Experience required : Indifferent
To trace and characterize the interactions between deep-sea water, hydrothermal fluids, and ferro-oxidizing microbial mats via the elemental and isotopic geochemistry of strontium, lithium and iron.
• Participate in the collection of natural samples at seabed observatories through oceanographic campaigns
• Analyze strontium, lithium and iron elemental/isotopic compositions, diffuse hydrothermal fluids and iron-rich microbial mats through state-of-the-art analytical services and platforms at GET, LEGOS and OSU-OMP
• Contribute to thermodynamic modeling of water-rock interactions
• Laboratory skills in performing geochemical (ICP-OES, ion chromatography and ICP-MS) and isotope mass spectrometry (TIMS, MC-ICPMS) analyses
• Clean room skills for sample treatment and processing
• Knowledge of marine fluid sampling protocols through oceanographic campaigns
• Basic knowledge of geochemical software for calculating mineral-fluid interactions (such as PHREEQC)
• Ability to work as a team within the ANR – IRONWOMAN consortium
• Ability to interact with the national and international community involved in the EMSO-deep-sea observatory
• Ability to communicate effectively in English and French
• Geological knowledge of ocean lithosphere and marine geochemistry
• Previous work experience not necessarily required
The GET laboratory, which is part of the Midi-Pyrénées Observatory (OSU-OMP), is composed of 7 research teams in geosciences and environment. In total, the laboratory has 170 permanent researchers and 90 contract agents (doctoral students, post-doctoral students) and depends on four administrative departments: CNRS, IRD, UPS and CNES.
The recruited post-doctoral candidate recruited will be assigned to the LOA research team: Coupling Lithosphere – Ocean - Atmosphere (ER4), and the scientific research axis “Marine geosciences”, developing its research project within the framework of the funded project ANR – IRONWOMAN under the direction of Valérie Chavagnac and Christine Destrigneville of GET and François Lacan of the Toulouse Isotopie Marine team of LEGOS (OSU-OMP laboratory). At the national level, the recruit will work in collaboration with the IRONWOMAN project teams (MIO, AD2M and LGE) involved in the seabed observatory (EMSO-Azores and EMSO-Ligure).
Constraints and risks
- oceanographic cruise
- clean laboratory work
This post-doctorate position is part of the ANR funded IRONWOMAN project (ttps://anrironwoman.wixsite.com/anr-ironwoman), which aims to validate the hypothesis of the primordial role of marine bacteria oxidizing iron (FeOB) in the development of iron-rich mats, and their impact on the biogeochemical cycle of iron and on primary production in the deep oceans, depending on the variations in the environmental conditions involved. This is based on 1) in situ sampling of iron-rich mats and their environments (some of which have already been carried out), either by annual sampling or by deployments of colonization experiments, and the development of a new instrument for sampling nucleic acids and fluids for monthly collection; 2) continuous monitoring of physico-chemical environmental conditions in two contrasting deep-sea environments of EMSO Azores (Mid-Atlantic hydrothermal site) and EMSO West Ligure (Mediterranean deep coastal plain), taking advantage of their deep-sea observatory status (IR EMSO France); and 3) geochemical, isotopic, multi-omic, cultural and microbiological analyses. Through this multidisciplinary, long-term approach and instrumental development, the IRONWOMAN project will provide a better understanding of ocean microbial biodiversity and its response to global environmental changes, which could impact the concentration of dissolved oxygen and iron (dO2 and dFe respectively) in the deep ocean.
As part of this project, the post-doctoral candidate will participate in the geochemical and isotopic characterization of strontium – lithium – iron environmental media bathing iron-rich mats.
Application document: CV, publication list, motivation letter
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