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Journal of Petrology Advance Access published online on December 14, 2004
Journal of Petrology, doi:10.1093/petrology/egh092
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Journal of Petrology © Oxford University Press 2005; all rights reserved
Received November 15, 2003
Accepted October 21, 2004

Article

Exhumation Paths of High-Pressure-Low-Temperature Metamorphic Rocks from the Lycian Nappes and the Menderes Massif (SW Turkey): a Multi-Equilibrium Approach

GAËTAN RIMMELÉ 1*, TEDDY PARRA 2, BRUNO GOFFÉ 2, ROLAND OBERHÄNSLI 3, LAURENT JOLIVET 4, and OSMAN CANDAN 5

1 LABORATOIRE DE GÉOLOGIE DE L'ECOLE NORMALE SUPÉRIEURE, CNRS, UMR 8538, 24, RUE LHOMOND, 75005 PARIS, FRANCE; INSTITUT FÜR GEOWISSENSCHAFTEN, UNIVERSITÄT POTSDAM, KARL LIEBKNECHTSTRASSE 24-25, D-14476 POTSDAM-GOLM, GERMANY
2 LABORATOIRE DE GÉOLOGIE DE L'ECOLE NORMALE SUPÉRIEURE, CNRS, UMR 8538, 24, RUE LHOMOND, 75005 PARIS, FRANCE
3 INSTITUT FÜR GEOWISSENSCHAFTEN, UNIVERSITÄT POTSDAM, KARL LIEBKNECHTSTRASSE 24-25, D-14476 POTSDAM-GOLM, GERMANY
4 LABORATOIRE DE TECTONIQUE, UMR 7072, UNIVERSITÉ PIERRE ET MARIE CURIE, TOUR 26-0, ETAGE 1, CASE 129, 4, PLACE JUSSIEU, 75252 PARIS CEDEX 05, FRANCE
5 DOKUZ EYLÜL ÜNIVERSITESI, MÜHENDISLIK-MIRMALIK FAKÜLTESI, JEOLOJI MÜH. BÖLÜMÜ, TR-35100 BORNOVA-IZMIR, TURKEY

* To whom correspondence should be addressed.
GAËTAN RIMMELÉ, E-mail: rimmele{at}geologie.ens.fr


  Abstract

The Menderes Massif and the overlying Lycian Nappes occupy an extensive area of SW Turkey where high-pressure-low-temperature metamorphic rocks occur. Precise retrograde P-T paths reflecting the tectonic mechanisms responsible for the exhumation of these high-pressure-low-temperature rocks can be constrained with multi-equilibrium P-T estimates relying on local equilibria. Whereas a simple isothermal decompression is documented for the exhumation of high-pressure parageneses from the southern Menderes Massif, various P-T paths are observed in the overlying Karaova Formation of the Lycian Nappes. In the uppermost levels of this unit, far from the contact with the Menderes Massif, all P-T estimates depict cooling decompression paths. These high-pressure cooling paths are associated with top-to-the-NNE movements related to the Akçakaya shear zone, located at the top of the Karaova Formation. This zone of strain localization is a local intra-nappe contact that was active in the early stages of exhumation of the high-pressure rocks. In contrast, at the base of the Karaova Formation, along the contact with the Menderes Massif, P-T calculations show decompressional heating exhumation paths. These paths are associated with severe deformation characterized by top-to-the-east shearing related to a major shear zone (the Gerit shear zone) that reflects late exhumation of high-pressure parageneses under warmer conditions.

Keywords: exhumation; high-pressure-low-temperature metamorphism; multi-equilibrium P-T estimates; Lycian Nappes; Menderes Massif.
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