Thermochronometric constraints on the tectonic evolution of the Serifos detachment, Aegean Sea, Greece |
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Authors: | Stephanie Brichau Stuart Thomson Uwe Ring |
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Institution: | (1) Joint Research School of Earth Sciences, University and Birkbeck College, London, WC1E7HX, UK;(2) Department of Geosciences, University of Arizona, Tucson, AZ 85721-0077, USA;(3) Department of Geological Sciences, University of Canterbury, Christchurch, 8140, New Zealand |
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Abstract: | We constrain the timing and kinematics of the Serifos detachment in the southwestern Cyclades, Greece, using low-temperature
thermochronometry. Fission-track dating shows that the Serifos detachment was active between ~13 and 6 Ma and that the Serifos
granodiorite in its footwall intruded at or before ~12–11 Ma into the extensional shear zone and initially cooled very rapidly
at rates >180°C per million year. The mylonite zone at the top of the granodiorite and mylonitic structures in its country
rocks record a consistent top-SSW shear sense in the ductile crust. In the brittle regime top-NNE shear-sense indicators occur
as well. Conjugate top-SSW and top-NNE high-angle normal faults are the youngest deformational features and cut across the
detachment. Age–distance relationships for the fission-track data display a relatively flat pattern. We discuss a model advocating
initial top-SSW movement on the Serifos detachment before and during emplacement of the granodiorite. Updoming of the detachment
during exhumation and cooling caused subsequent bivergent extension in the brittle crust. |
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