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Geological Magazine; March 2007; v. 144; no. 2; p. 393-400; DOI: 10.1017/S001675680700310X
© 2007 Cambridge University Press (CUP)
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Record of a Palaeogene syn-collisional extension in the north Aegean region: evidence from the Kemer micaschists (NW Turkey)

LAURENT BECCALETTO*,*, NIKOLAY BONEV{dagger}, DELPHINE BOSCH{ddagger} and OLIVIER BRUGUIER§

* Institute of Geology and Paleontology, University of Lausanne, CH-1015 Lausanne, Switzerland
{dagger} Department of Geology and Paleontology, Sofia University ‘St. Kliment Ohridski’, 15 Tzar Osvoboditel Bd., 1504 Sofia, Bulgaria
{ddagger} Laboratoire de Tectonophysique, Université de Montpellier II, UMR 5568-CNRS/UMII, Place E. Bataillon, 34 095 Montpellier Cedex 05, France
§ Service ICP-MS, ISTEEM, Université de Montpellier II, Place E. Bataillon, 34 095 Montpellier Cedex 05, France

* Author for correspondence: laurent.beccaletto{at}unil.ch

In NW Turkey, the medium-grade Kemer micaschists of the Biga Peninsula record NE-directed extension related to ductile to brittle–ductile shearing during the Palaeogene period: a lower limit for their exhumation is given by the Late Maastrichtian age of the HP–LT metamorphism of a similar nearby area (Çamlica micaschists); an upper limit is given by the Early Eocene intrusion age of the post-kinematic Karabiga granitoid, dated as 52.7 ± 1.9 Ma using the U–Pb LA–ICP–MS method on xenotime. Correlations with the northeasterly Rhodope region and integration into the geodynamic regional frame indicate that the Kemer micaschists experienced an extensional deformation connected to a collisional context in latest Cretaceous–early Tertiary times. The Kemer micaschists therefore represent a new area (the first in Turkey), which suffered synorogenic extension in the north Aegean domain at the very beginning of Tertiary times.

Key Words: ductile shear • metamorphism • extension • north Aegean • U–Pb (LA–ICP–MS) geochronology • xenotime




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