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Journal of the Geological Society; 2008; v. 165; issue.1; p. 263-277;
DOI: 10.1144/0016-76492006-145
© 2008 Geological Society of London

Original Article

Timing, slip rate, displacement and cooling history of the Mykonos detachment footwall, Cyclades, Greece, and implications for the opening of the Aegean Sea basin

Stéphanie Brichau1, Uwe Ring2, Andrew Carter1, Robert Bolhar2, Patrick Monié3, Daniel Stockli4 & Maurice Brunel3

1 School of Earth Sciences, University and Birkbeck College, London WC1E 7HX, UK (e-mail: s.brichau{at}bbk.ac.uk)
2 Department of Geological Sciences, University of Canterbury, Christchurch 8140, New Zealand
3 UMR 5573, Université Montpellier II, 34095 Montpellier Cedex 05, France
4 Department of Geology, University of Kansas, Lawrence, KS 66045, USA

We constrain the slip and cooling history of the Mykonos detachment footwall using thermochronometry. A U–Pb zircon age of 13.5 ± 0.3 Ma dates intrusion of the Mykonos monzogranite. 40Ar/39Ar hornblende and biotite ages from the monzogranite are 12.7 ± 0.6 Ma and 10.9 ± 0.6 Ma, whereas zircon and apatite fission-track ages range from 13 ± 0.8 Ma to 10.7 ± 0.8 Ma and 12.5 ± 2.2 Ma to 10.5 ± 1.8 Ma. (U–Th)/He ages range from 13.6 ± 0.6 Ma to 9.0 ± 0.7 Ma for zircon and 11.1 ± 0.5 Ma to 8.9 ± 0.4 Ma for apatite. The ages in part overlap within 2{sigma} errors and together with the long apatite fission-track lengths (>14 µm) support rapid cooling at rates >100 °C Ma–1. The low-temperature thermochronometric ages decrease east-northeastwards in the direction of hanging-wall transport on the Mykonos detachment. Age–distance relationships show that the Mykonos detachment slipped at an average rate of 6.0 +9.2/–2.4 km Ma–1 causing c. 30 km of offset and c. 12 km of exhumation. This result indicates that Miocene low-angle normal faulting was not important for the exhumation of the Cycladic blueschist unit. The opening of the Aegean Sea basin in the Miocene was controlled by a few large-magnitude low-angle normal faults.





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U. RING and C. KUMERICS
Vertical ductile thinning and its contribution to the exhumation of high-pressure rocks: the Cycladic blueschist unit in the Aegean
Journal of the Geological Society, 2008; 165: 1019 - 1030.
[Abstract] [Full Text] [PDF]