Complex layered deformation within the Aegean crust and mantle revealed by seismic anisotropy

Endrun, B., Lebedev, S., Meier, T., Tirel, C. and Friederich, W. (2011) Complex layered deformation within the Aegean crust and mantle revealed by seismic anisotropy Nature Geoscience, 4 (3). pp. 203-207. DOI 10.1038/ngeo1065.

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Abstract

Continental lithosphere can undergo pervasive internal deformation, often distributed over broad zones near plate boundaries. However, because of the paucity of observational constraints on three-dimensional movement at depth, patterns of flow within the lithosphere remain uncertain. Endmember models for lithospheric flow invoke deformation localized on faults or deep shear zones or, alternatively, diffuse, viscous-fluid-like flow. Here we determine seismic Rayleigh-wave anisotropy in the crust and mantle of the Aegean region, an archetypal example of continental deformation. Our data reveal a complex, depth-dependent flow pattern within the extending lithosphere. Beneath the northern Aegean Sea, fast shear wave propagation is in a North–South direction within the mantle lithosphere, parallel to the extensional component of the current strain rate field. In the south-central Aegean, where deformation is weak at present, anisotropic fabric in the lower crust runs parallel to the direction of palaeo-extension in the Miocene. The close match of orientations of regional-scale anisotropic fabric and the directions of extension during the last significant episodes of deformation implies that at least a large part of the extension in the Aegean has been taken up by distributed viscous flow in the lower crust and lithospheric mantle.

Document Type: Article
Research affiliation: OceanRep > The Future Ocean - Cluster of Excellence > FO-R09
OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > The Future Ocean - Cluster of Excellence > FO-R06
Kiel University
Refereed: Yes
DOI etc.: 10.1038/ngeo1065
ISSN: 1752-0894
Projects: Future Ocean
Date Deposited: 04 Oct 2017 15:58
Last Modified: 24 Sep 2019 03:48
URI: http://eprints.uni-kiel.de/id/eprint/39643

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