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GEO-TECTONICS  May 2018

GEO-TECTONICS May 2018

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Subject:

PhD position in Rennes (petrology-geochronology)

From:

Pavel Pitra <[log in to unmask]>

Reply-To:

Tectonics & structural geology discussion list <[log in to unmask]>

Date:

Wed, 2 May 2018 01:08:21 +0200

Content-Type:

multipart/mixed

Parts/Attachments:

Parts/Attachments

text/plain (95 lines) , PhD-Rennes-DatMetEN.pdf (95 lines)

Dear colleagues,

please see the attached file for a full-time 3-year PhD opportunity in 
metamorphic petrology - geochronology at Rennes University, France.
Please don't hesitate to transfer it to the potentially interested 
candidates.

All the best,

Pavel


---

A critical study of age constraints on metamorphism in convergence 
zones: from burial to exhumation
3-year PhD position at the University of Rennes (France)
Advisors: Pavel Pitra, Marc Poujol, Philippe Yamato

Dating metamorphic events is a major challenge for the understanding of 
orogenic processes. It brings temporal constraints on the 
pressure-temperature evolution (P-T path) of rocks during their burial 
(e.g. in subduction zones) and subsequent exhumation. Coupling 
metamorphic and geochronological data is therefore crucial for the 
understanding of the dynamics of convergence zones and, consequently, 
for proposing any geodynamic reconstructions. The robustness of this 
link is therefore a first-order issue. As an example, 
sub-contemporaneous ages obtained for both the high- and low-pressure 
metamorphic stages in a same geological domain can lead to either (i) 
propose extremely fast exhumation rates, the physical and/or tectonic 
mechanisms of which remain unknown, or (ii) question the classic 
interpretation of the pressure recorded by metamorphic rocks in terms of 
burial depth, or (iii) reconsider the overall interpretation of the 
acquired radiometric data in metamorphic rocks.
High-pressure rocks (e.g. eclogites) that have undergone significant 
decompression (e.g. in the low-pressure granulite facies) are the most 
interesting targets for addressing these issues. Classically, P-T paths 
are linked to ages through the analysis of trace elements in the dated 
minerals, which are supposed to reflect the moment of crystallization of 
the mineral along the P-T path. However, our preliminary results from 
several variscan eclogites show the limitations of this approach, as it 
does not necessarily yield reliable results. This has a strong impact on 
the geodynamic interpretation of the studied region.
This study will be focused on two specific eclogite-facies rock targets, 
the Norwegian Caledonides and the Rhodope belt, where the ‘issue’ of 
sub-contemporaneous ages attributed to the high- and low-pressure stages 
of their respective metamorphic evolution is known. The advantage of 
these two orogens is also that they cover a large time span to explore 
(~400 Ma for the Caledonian belt and ~50 Ma for the Rhodope). The goal 
of this PhD project is to combine state-of-the-art petrological, 
geochemical and geochronological analyses on these eclogite-facies 
rocks, using a large spectrum of methods:
- a detailed petrological analysis, including meticulous petrography and 
phase equilibria modelling (Theriak-Domino, THERMOCALC)
- combination of several dating techniques (U-Th-Pb on zircon, monazite, 
rutile, titanite, apatite,…, Sm-Nd and Lu-Hf on garnet)
- trace elements (REE) partitioning between the dated minerals and the 
main metamorphic rock-forming phases
- using Raman spectroscopy to identify inclusions in the dated minerals 
and to constrain their entrapment pressure (shift of spectral peaks)
- trace-element thermobarometry (Ti-in-zircon, Zr-in-rutile, Ti-in-quartz)

Requirements: The candidate must hold a Master diploma (MSc or 
equivalent) in geology and have solid basic knowledge in metamorphic 
petrology, geochronology and tectonics. Previous experience with one or 
several of the methods used is a plus. Good communication skills are 
expected.

Some more details can be found at 
https://theses.u-bretagneloire.fr/egaal/theses-2018. The application 
must also be done through this web page, but interested candidates are 
invited to first contact the advisors (Pavel Pitra 
<[log in to unmask]>, Marc Poujol 
<[log in to unmask]>, Philippe Yamato 
<[log in to unmask]>) and send a full CV, a statement of 
interest, mark reports, details about previous internships etc., and the 
names and emails of two references, *before mid-May*. The deadline for 
online application is May 31, 2018.






-- 
Pavel PITRA
Géosciences Rennes			[log in to unmask]
Université Rennes 1			tel: (++33) 2.23.23.65.06
Campus de Beaulieu - Bat. 15		
F - 35 042 RENNES CEDEX
FRANCE				http://www.geosciences.univ-rennes1.fr/
           https://geosciences.univ-rennes1.fr/interlocuteurs/pavel-pitra


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