Journal of Petrology Advance Access originally published online on December 14, 2004
Journal of Petrology 2005 46(3):641-669; doi:10.1093/petrology/egh092
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Exhumation Paths of High-Pressure–Low-Temperature Metamorphic Rocks from the Lycian Nappes and the Menderes Massif (SW Turkey): a Multi-Equilibrium Approach
1 LABORATOIRE DE GÉOLOGIE DE L'ECOLE NORMALE SUPÉRIEURE, CNRS, UMR 8538, 24, RUE LHOMOND, 75005 PARIS, FRANCE
2 INSTITUT FÜR GEOWISSENSCHAFTEN, UNIVERSITÄT POTSDAM, KARL LIEBKNECHTSTRASSE 24–25, D-14476 POTSDAM-GOLM, GERMANY
3 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
4 DOKUZ EYLÜL ÜNIVERSITESI, MÜHENDISLIK-MIRMALIK FAKÜLTESI, JEOLOJI MÜH. BÖLÜMÜ, TR-35100 BORNOVA–IZMIR, TURKEY
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.
KEY WORDS: exhumation; high-pressure–low-temperature metamorphism; multi-equilibrium P–T estimates; Lycian Nappes; Menderes Massif
* Corresponding author. Telephone: 00 33 1 44 32 22 74. Fax: 00 33 1 44 32 20 00. E-mail: rimmele{at}geologie.ens.fr
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