Kinematics and age of the Afyon Zone in the Akhisar region,western Türkiye

Abstract

In western Anatolia, to the south of the İzmir-Ankara Suture, Menderes Massif, Cycladic Blueschists, Afyon Zone and Bornova Mélange form the main tectonic belts from structurally bottom to top. In the Akhisar region, the Akhisar Nappe consists of Hasköy Formation, below, and Görenez Limestone, above. The Hasköy Formation is composed of a metaclastic sequence with metarhyolite intercalations (237.4 ± 1.1 Ma, zircon LA-ICP-MS) and recrystallized limestone lenses, and it gradually passes upward into late Norian-Early Jurassic Görenez Limestone. New radiogenic data from metarhyolites of the Hasköy Formation and fossil determinations from recrystallized limestones of the Görenez Limestone show that the age of Akhisar Nappe ranges from early Late Triassic to Early Jurassic. Along contact between the Akhisar Nappe and the Menderes Massif, the linear fabric and associated asymmetric structures in mylonitic fault zone indicate a top-NE shear sense. Correlation between the internal stratigraphy of the Akhisar Nappe and the Mesozoic part of the Afyon Zone sequences in its eastern part indicate that the Akhisar Nappe is the western continuation of the Afyon Zone.