Soutenance de thèse de Konstantinos Kydonakis (Géosciences Rennes)


 AHLeGall    22/10/2014 : 21:23

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Le mercredi 22 octobre 2014 à 14h00, en salle de conf de l'OSUR (RDC bât;14B, campus de Beaulieu, Université de Rennes 1), Konstantinos Kydonakis soutient sa thèse intitulée

Le mercredi 22 octobre 2014 à 14h00, en salle de conf de l'OSUR (RDC bât;14B, campus de Beaulieu, Université de Rennes 1), Konstantinos Kydonakis soutient sa thèse intitulée

Mesozoic Tectonics of the Aegean


Jury :
Jean-Pierre Burg (Professor, ETH, Zurich - reviewer)
Torgeir Andersen (Professor, University of Oslo - reviewer)
Kerry Gallagher (Professor, Géosciences Rennes - member)
Claudio Faccenna (Professor, Rome TRE - member)
Dimitrios Kostopoulos (Project Generation Leader, Eldorado Gold - member)
Jean-Pierre Brun (Professor, Géosciences Rennes - supervisor)
Frédéric Gueydan (Professor, Géosciences Montpellier - co-supervisor)


Abstract:
My study is part of the EC-Marie Curie Initial Training Network (ITN) project named TOPOMOD -Sculpting the Earth’s topography: insights from modelling deep-surface processes- (www.topomod.eu) within the Seventh Framework Programme (http://cordis.europa.eu/fp7/home_en.html) and is based around a multidisciplinary approach that aims to unravel different aspects of the deformation pattern of the North Aegean Domain. In this study, we considered the Chalkidiki Peninsula of northern Greece as an ideal area to study the deformation of the Aegean, from Cretaceous syn-metamorphic thrusting to Tertiary extension, using a variety of geological tools that includes generating both field and laboratory datasets. For the purpose of this study, we carried out several field mapping campaigns measuring the geometry of structural fabrics. An overview of the regional geometry is given in the compiled regional maps that illustrate the attitude of the measured planar and linear structural fabrics. We evaluated the intensity of the metamorphic conditions using isochemical phase diagram sections calculated by minimisation of the Gibbs free energy. Based on our model results, we inferred the existence of an early eclogite-facies event before the regional amphibolite-facies overprint. We performed high- (U/Pb in zircon and monazite) and medium-temperature (40Ar/39Ar on micas) geochronologic analyses coupled with low-temperature thermochronology and inverse thermal history modelling using a Bayesian transdimensional inversion scheme. The modelling results delineated the complete thermal path (T-t) of the study area from Cretaceous heating to Eocene near-surface arrival. We modelled the Tertiary geological evolution of the North Aegean with respect to exhumation of lower crust during core complex formation. Using scaled laboratory experiments we tested whether the gravity spreading of a crustal-scale thrust wedge that undergoes extension is a suitable process for the development of the North Aegean core complexes during the early opening of the Aegean. Our analysis suggests that strain localisation and core complex development near the backstop of the area affected by extension is intrinsic to the pre-collapse geometry of the orogenic wedge.


Contact : @"+"@"+"";self.close();' onmouseover='window.status="mai"+"lto:"+"@"+"@"+""; return true;' onmouseout='window.status="";return true;'>Konstantinos Kydonakis (Géosciences Rennes)