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Geometry and Kinematics of Bivergent Extension in the Southern Cycladic Archipelago: Constraining an Extensional Hinge Zone on Sikinos Island, Aegean Sea, Greece
Stockholm University, Faculty of Science, Department of Geological Sciences.
Number of Authors: 22021 (English)In: Tectonics, ISSN 0278-7407, E-ISSN 1944-9194, Vol. 40, no 6, article id e2020TC006641Article in journal (Refereed) Published
Abstract [en]

We report the results of a field study on Sikinos Island in the Aegean extensional province of Greece and propose a hinge zone controlling incipient bivergent extension in the southern Cyclades. A first deformation event led to top-S thrusting of the Cycladic Blueschist Unit (CBU) onto the Cycladic basement in the Oligocene. The mean kinematic vorticity number (Wm) during this event is between 0.56 and 0.63 in the CBU, and 0.72 to 0.84 in the basement, indicating general-shear deformation with about equal components of pure and simple shear. The strain geometry was close to plane strain. Subsequent lower-greenschist-facies extensional shearing was also by general-shear deformation; however, the pure-shear component was distinctly greater (Wm = 0.3–0.41). The degree of subvertical pure-shear flattening increases structurally upward and explains alternating top-N and top-S shear senses over large parts of the island. Along with an increased coaxial deformation component, the strain geometry became oblate. Published quantitative data from nearby Ios Island are similar and both data sets define an extensional hinge zone between top-N extensional deformation across large parts of the central and northern Cyclades and top-S extensional deformation at the southern and western fringe of the archipelago. This extensional hinge zone is an important large-scale structure forming early in the history of lithospheric extension due to southward retreat of the Hellenic slab.

Place, publisher, year, edition, pages
2021. Vol. 40, no 6, article id e2020TC006641
Keywords [en]
Aegean Sea, Cycladic blueschist unit, extensional deformation, Greece, kinematic vorticity, strain analysis
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-196782DOI: 10.1029/2020TC006641ISI: 000665973300007OAI: oai:DiVA.org:su-196782DiVA, id: diva2:1598695
Available from: 2021-09-29 Created: 2021-09-29 Last updated: 2022-02-25Bibliographically approved

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Ring, UweGlodny, Johannes

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