HAL : insu-00715950, version 1

DOI : 10.1016/j.tecto.2012.06.011

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Tectonophysics Accepted manuscript (2013) 95 p.

Aegean tectonics: Strain localisation, slab tearing and trench retreat

Laurent Jolivet 1, Claudio Faccenna 2, Benjamin Huet 3, Loic Labrousse 4, Laetitia Le Pourhiet 4, Olivier Lacombe 4, Emmanuel Lecomte 4, Evgenii E.B. Burov 4, Yoann Denèle 5, Jean-Pierre Brun 6, Frédéric Gueydan 7, Mélody Philippon 6, Anne Paul 4, Gwenaëlle Salaün 4, Hayrullah Karabulut 8, Claudia Piromallo 9, Patrick Monié 7, Aral I. Okay 10, Roland Oberhänsli 11, Amaury Pourteau 11, Romain Augier 1, Leslie Gadenne 1, Olivier Driussi 1

(2013)

We review the geodynamic evolution of the Aegea-Anatolia region and discuss strain localisation there over geological times. From Late Eocene to Present, crustal deformation in the Aegean backarc has localised progressively during slab retreat. Extension started with the formation of the Rhodope Metamorphic Core Complex (Eocene) and migrated to the Cyclades and the northern Menderes massif (Oligocene and Miocene), accommodated by crustal-scale detachments and a first series of core complexes (MCCs). Extension then localised in Western Turkey, the Corinth Rift and the external Hellenic arc after Messinian times, while the North Anatolian Fault penetrated the Aegean Sea. Through time the direction and style of extension have not changed significantly except in terms of localisation. The contributions of progressive slab retreat and tearing, basal drag, extrusion tectonics and tectonic inheritance are discussed and we favour a model (1) where slab retreat is the main driving engine, (2) successive slab tearing episodes are the main causes of this stepwise strain localisation and (3) the inherited heterogeneity of the crust is a major factor for localising detachments. The continental crust has an inherited strong heterogeneity and crustal-scale contacts such as major thrust planes act as weak zones or as zones of contrast of resistance and viscosity that can localise later deformation. The dynamics of slabs at depth and the asthenospheric flow due to slab retreat also have influence strain localisation in the upper plate. Successive slab ruptures from the Middle Miocene to the Late Miocene have isolated a narrow stripe of lithosphere, still attached to the African lithosphere below Crete. The formation of the North Anatolian Fault is partly a consequence of this evolution. The extrusion of Anatolia and the Aegean extension are partly driven from below (asthenospheric flow) and from above (extrusion of a lid of rigid crust).

1 :	Institut des Sciences de la Terre d'Orléans (ISTO)
	Université d'Orléans – CNRS : UMR7327 – INSU – Bureau de Recherches Géologiques et Minières (BRGM)
2 :	Università “Roma TRE”, Dipartimento Scienze Geologiche, Roma
	inconnue
3 :	Structural Processes Group Vienna
	University of Vienna
4 :	Institut des Sciences de la Terre de Paris (iSTeP)
	CNRS : UMR7193 – Université Pierre et Marie Curie [UPMC] - Paris VI
5 :	Géosciences Environnement Toulouse (GET)
	CNRS : UMR5563 – Institut de recherche pour le développement [IRD] : UMR239 – Université Paul Sabatier [UPS] - Toulouse III – Observatoire Midi-Pyrénées
6 :	Géosciences Rennes (GR)
	CNRS : UMR6118 – INSU – Observatoire des Sciences de l'Univers de Rennes – Université de Rennes 1
7 :	Géosciences Montpellier (GM)
	CNRS : UMR5243 – Université Montpellier II - Sciences et techniques
8 :	Kandilli Observatory and Earthquake Research Institute
	Bogazici University
9 :	INGV, Rome
	inconnue
10 :	Avrasya Yerbilimleri Enstitüsü, Istanbul Teknik Universitesi
	Istanbul Teknik Universitesi
11 :	Institut für Erd‐ und Umweltwissenschaften
	Universität Potsdam

domaine

:

Planète et Univers/Sciences de la Terre/Tectonique Sciences de l'environnement/Milieux et Changements globaux

mots-clés : backarc extension – slab retreat – asthenospheric flow – strain localisation – Aegean Sea – metamorphic core complex

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Contributeur : Nathalie Pothier <>

Soumis le : Vendredi 24 Août 2012, 08:20:29

Dernière modification le : Mardi 22 Janvier 2013, 15:04:20