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Record of a Palaeogene syn-collisional extension in the north Aegean region: evidence from the Kemer micaschists (NW Turkey)

Published online by Cambridge University Press:  13 February 2007

LAURENT BECCALETTO
Affiliation:
Institute of Geology and Paleontology, University of Lausanne, CH-1015 Lausanne, Switzerland
NIKOLAY BONEV
Affiliation:
Department of Geology and Paleontology, Sofia University ‘St. Kliment Ohridski’, 15 Tzar Osvoboditel Bd., 1504 Sofia, Bulgaria
DELPHINE BOSCH
Affiliation:
Laboratoire de Tectonophysique, Université de Montpellier II, UMR 5568-CNRS/UMII, Place E. Bataillon, 34 095 Montpellier Cedex 05, France
OLIVIER BRUGUIER
Affiliation:
Service ICP-MS, ISTEEM, Université de Montpellier II, Place E. Bataillon, 34 095 Montpellier Cedex 05, France

Abstract

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 (Çamlıca 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.

Type
Original Article
Copyright
© 2007 Cambridge University Press

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