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Déformation des unités métamorphiques de haute pression de la subduction à l'exhumation. (Exemple des Cyclades, Grèce)

Abstract : High pressure-­‐low temperature metamorphic rocks are witness of the behaviour of subduction zones at lithosphere scale. These rocks undergo prograde and retrograde metamorphism during burial and exhumation, respectively. During exhumation, deformation evolves from ductile to brittle. The present thesis consists in an analysis of the successive deformations recorded by the Cycladic Blueschist Unit (CBU) in Greece during a subduction-­‐exhumation cycle, in the frame of the Aegean back-­‐arc extension. The study of ductile deformations recorded by the CBU was used to separate those associated to burial, during subduction, from those related to exhumation and to characterise their kinematics in the frame of the Aegean extension dynamics. A restoration of post-­‐12 Ma deformations shows that in early to middle Miocene deformation is due to only one detachment (the North Cycladic Detachment) controlled only one core complex (the Central Cyclades Core Complex). Laboratory experiments on small-­‐scale models have been used to argue that Aegean extension, since 12 Ma, resulted from an interaction between the Hellenic subduction retreat toward the SW and the westward displacement of Anatolia at least 7 years earlier than what was thought up to now. The folded domain of the central Cyclades is a direct witness of this interaction. The experiments also show that the Vardar suture has played an important localising role in this process as a pre-­‐existing weak zone
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https://hal-insu.archives-ouvertes.fr/tel-01137796
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Submitted on : Tuesday, March 31, 2015 - 2:58:59 PM
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Melody Philippon. Déformation des unités métamorphiques de haute pression de la subduction à l'exhumation. (Exemple des Cyclades, Grèce). Sciences de la Terre. Universite Rennes 1, 2010. Français. ⟨tel-01137796⟩

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