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* Institute of Geology and Paleontology, University of Lausanne, CH-1015 Lausanne, Switzerland
Department of Geology and Paleontology, Sofia University St. Kliment Ohridski, 15 Tzar Osvoboditel Bd., 1504 Sofia, Bulgaria
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 brittleductile shearing during the Palaeogene period: a lower limit for their exhumation is given by the Late Maastrichtian age of the HPLT metamorphism of a similar nearby area (Çaml
ca 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 UPb LAICPMS 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 Cretaceousearly 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 UPb (LAICPMS) geochronology xenotime
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