02/04/2021
The Human Resources Strategy for Researchers

Phd contract in the field of Earth sciences financed for three years by the University of Clermont Auvergne


  • ORGANISATION/COMPANY
    Université Clermont Auvergne
  • RESEARCH FIELD
    Geosciences
  • RESEARCHER PROFILE
    First Stage Researcher (R1)
  • APPLICATION DEADLINE
    23/05/2021 00:00 - Europe/Brussels
  • LOCATION
    France › Aubière
  • TYPE OF CONTRACT
    Temporary
  • JOB STATUS
    Full-time
  • HOURS PER WEEK
    35
  • OFFER STARTING DATE
    01/10/2021
  • REFERENCE NUMBER
    SF-CD-2021-026

OFFER DESCRIPTION

Exploration of crustal differentiation: a multi scale etrogeochemical study

In the post-Archean times, the continental crust is dominated by granitoids and it is accepted that there is a relationship between granite production and crustal growth, however, this link is still difficult to quantify. To overcome this difficulty, we need to evaluate the precise crust/mantle component of the granites sources, and the genetic link between lower crustal rocks and upper crustal granitic plutons. Previous studies have focussed on whole rock and zircons but their interpretation are still highly debated. The goal of this project is to study partially melted rocks from the lower crust, granites and enclaves within them to explore and better constrain crustal evolution processes which control the formation of the continental crust. To succeed, this project will use recent analytical developments at the mineral scale on REE-bearing minerals (apatite, titanite, monazite, allanite, zircon). The results obtained at the mineral scale (<600 microns) will be compared to whole rock analyses in order to study potential isotopic disequilibrium during partial melting and/or hybridization of magmas. These results will then be integrated in a more general context at the outcrop scale (few meters) and then at the crustal section scale (few kms). This project requires fieldwork in key locations where middle and lower crust granites and partially melted rocks are accessible. In these locations, a variety of granitoids (calk-alkaline and peraluminous) and partially melted lower and middle crust samples (granulite and amphibolite) will be carefully sampled. The studied localities represent exceptional Hercynian deep crustal roots and display direct field evidence of hybridization of granitoid via the incorporation of partially melted granulite to granitoid bodies. The PhD position will be conducted at the Laboratoire Magmas et Volcans (LMV) in Clermont-Ferrand, France. The appointment is for three years and will preferentially start on October 1st, 2021. Candidates should have a strong interest in petrology and geochemistry. A first experience using in-situ analytical techniques (microprobe, LA-ICP-MS) and/or in clean lab and with mass spectrometry techniques is preferable.

Methods : This work will require (i) sampling during two field seasons in collaboration with Antonio Langone (Pavia, Italy), (ii) a detailed metamorphic and magmatic petrological study of the different lithologies, (iii) the use of imaging and various in-situ analyses : SEM to identify the different phases, microprobe for major and minor elements analyses, LA-ICP-MS for trace elements analyses, (LA)-MC-ICP-MS for isotopes analyses (iv) the use of clean lab chemistry. 1Bruand E., Fowler M., Storey C., Laurent O., Antoine C., Guitreau M., Heilimo E., Nebel O. (2020). Accessory mineral constraints on crustal evolution: elemental fingerprints for magma discrimination. Geochemical Perspectives Lettersvol.13, p.712, DOI:10.7185/geochemlet.2006. 2Doucelance R., Bruand E., Matte S., Bosq C., Auclair D., Gannoun A.M.(2020). In-situ determination of Nd isotope ratios in apatite by LA-MC-ICPMS:Challenges and limitations.Chemical Geologyvol.550, p.119740, DOI:10.1016/j.chemgeo.2020.119740. 3Gasser, D., Bruand, E., Rubatto, D., Stüwe, K. (2014) The behaviour of monazite from greenschist facies phyllites to anatectic gneisses: an example from the Chugach Metamorphic Complex, southern Alaska. Lithos, 134-35, 108-122

More Information

Offer Requirements

  • REQUIRED EDUCATION LEVEL
    Geosciences: Master Degree or equivalent

Map Information

Job Work Location Personal Assistance locations
Work location(s)
1 position(s) available at
Magmas and Volcanoes Laboratory
France
Région Auvergne Rhône-Alpes
Aubière
63178
Campus Universitaire des Cézeaux, TSA 60026 - CS 60026, 6 Avenue Blaise Pascal

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EURAXESS offer ID: 623000

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