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Geological Magazine; May 2003; v. 140; no. 3; p. 245-252; DOI: 10.1017/S0016756803007799
© 2003 Cambridge University Press (CUP)
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Article

Fast extension but little exhumation: the Vari detachment in the Cyclades, Greece

UWE RING*,*, STUART N. THOMSON{dagger} and MICHAEL BRÖCKER{ddagger}

* Institut für Geowissenschaften, Johannes Gutenberg-Universität, 55099 Mainz, Germany
{dagger} Institut für Geologie, Mineralogie und Geophysik, Ruhr-Universität, 44780 Bochum, Germany
{ddagger} Institut fur Mineralogie, Westfälische Wilhelms-Universität, 48149 Müunster, Germany

* Author for correspondence: ring{at}uni-mainz.de

Markedly different cooling histories for the hanging- and footwall of the Vari detachment on Syros and Tinos islands, Greece, are revealed by zircon and apatite fission-track data. The Vari/Akrotiri unit in the hangingwall cooled slowly at rates of 5–15 °C Myr–1 since Late Cretaceous times. Samples from the Cycladic blueschist unit in the footwall of the detachment on Tinos Island have a mean zircon fission-track age of 10.0 ± 1.0 Ma, which together with a published mean apatite fission-track age of 9.4 ± 0.5 Ma indicates rapid cooling at rates of at least ~ 60 °C Myr–1. We derive a minimum slip rate of ~ 6.5 km Myr–1 and a displacement of >~ 20 km and propose that the development of the detachment in the thermally softened magmatic arc aided fast displacement. Intra-arc extension accomplished the final ~ 6–9 km of exhumation of the Cycladic blueschists from ~ 60 km depth. The fast-slipping intra-arc detachments did not cause much exhumation, but were important for regional-scale extension and the formation of the Aegean Sea.

Key Words: Detachment faults • fission-track dating • exhumation • Cyclades • Greece




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