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Aegean tectonics strain localisation, slab tearing and trench retreat

  • We review the geodynamic evolution of the Aegean-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 (I) where slab retreat is the main driving engine, (2) successive slab tearing episodes are the mainWe review the geodynamic evolution of the Aegean-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 (I) 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 strip 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).show moreshow less

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Author:Laurent Jolivet, Claudio Faccenna, Benjamin Huet, Loic Labrousse, Laetitia Le Pourhiet, Olivier Lacombe, Emmanuel Lecomte, Evguenii Burov, Yoann Denele, Jean-Pierre Brun, Melody Philippon, Anne Paul, Gwenaelle Salaue, Hayrullah Karabulut, Claudia Piromallo, Patrick Monie, Frederic Gueydan, Aral I. Okay, Roland OberhänsliGND, Amaury Pourteau, Romain Augier, Leslie Gadenne, Olivier Driussi
DOI:https://doi.org/10.1016/j.tecto.2012.06.011
ISSN:0040-1951 (print)
Parent Title (English):Tectonophysics : international journal of geotectonics and the geology and physics of the interior of the earth
Publisher:Elsevier
Place of publication:Amsterdam
Document Type:Review
Language:English
Year of first Publication:2013
Year of Completion:2013
Release Date:2017/03/26
Tag:Aegean Sea; Asthenospheric flow; Backarc extension; Metamorphic core complex; Slab retreat; Strain localisation
Volume:597
Pagenumber:33
First Page:1
Last Page:33
Funder:EGEO project; SIMBAAD ANR project; TUBA (Turkish Academy of Sciences)
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Erd- und Umweltwissenschaften
Peer Review:Referiert