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1 Institut für Geowissenschaften, Johannes Gutenberg-Universität, 55099 Mainz, Germany
2 T.H. Huxley School of Environment, Earth Science and Engineering, Imperial College, London SW7 2BP, UK
3 GeoForschungsZentrum, Telegrafenberg, 14473 Potsdam, Germany
4 Jeologi Mühendisligi Bölümü, Dokuz Eylül Üniversitesi, 35100 Bornova, Turkey
Two symmetrically arranged detachment systems delimit the central Menderes metamorphic core complex and define a bivergent continental breakaway zone in the Anatolide belt of western Turkey. Structural analysis and apatite fission-track thermochronology show that a large east-trending syncline within the Alpine nappe stack in the central part of the orogen is related to late Miocene–early Pliocene to recent core-complex formation. The syncline formed as a result of two opposite-facing rolling hinges in the footwalls of each of the two detachments. Back-rotation of the syncline limbs suggests that the detachments rotated from an initial dip of 40°–60° to a currently shallow orientation of 0°–20°.
Key Words: detachment faults • core complexes • fission-track dating • extension tectonics • Turkey
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