Strain and flow in the metamorphic core complex of Ios Island (Cyclades, Greece).

Mizera, Marcel and Behrmann, Jan H. (2016) Strain and flow in the metamorphic core complex of Ios Island (Cyclades, Greece). International Journal of Earth Sciences, 105 (7). pp. 2097-2110. DOI 10.1007/s00531-015-1259-y.

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We have analysed strain and flow kinematics in the footwall of the South Cyclades Shear Zone (SCSZ), an important tectonic boundary within the Attic-Cycladic Crystalline Complex exposed on Ios Island, Cyclades, Aegean Sea. Coarse-grained augen gneisses in the basement unit flooring the SCSZ and forming a metamorphic core complex are excellently suited to measure finite strain using the Fry method and estimate the vorticity number (Wk) of flow with the “blocked-object” method. The results show that Oligo-Miocene exhumation of the basement unit during extension brought approximately 70 % N–S crustal stretching and up to 40 % subvertical shortening in a plane strain environment (k = 0.99). Linear down-section strain decrease constrains a zone of contact deformation of the SCSZ of about 1.5 km thick. Kinematic vorticity number estimates suggest little deviation from pure shear (Wk = 0.26). Finite strain and Wk are not correlated, indicating that the Ios basement and the overlying cover units were stretched compatibly. While the SCSZ is a localized zone of high strain, net displacement, however, may be restricted to about ten kilometres. This has important repercussions on large-scale tectonic models for extension in the Aegean.

Document Type: Article
Additional Information: WOS:000384423000012
Keywords: South Cyclades Shear Zone, Thrust, Detachment, Aegean Sea, Metamorphic core complex, Ios
Research affiliation: OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Kiel University
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1007/s00531-015-1259-y
ISSN: 1437-3254
Date Deposited: 27 Oct 2016 12:51
Last Modified: 01 Feb 2019 14:59

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