Structural analyis of the Menderes metamorphics, Lycian nappes and Bornova melange rocks of the Izmir-Ankara zone in Akhisar (Manisa)

In the Akhisar region to the northeast of İzmir in west Turkey, the Menderes massif, the Lycian nappes and the Bornova melange of the İzmir-Ankara zone form the main tectonic belts in structurally ascending order. In this region the Menderes massif is represented by massive marbles. The Akhisar nappe of the the Lycian nappes tectonically overlays the Menderes massif and is newly described in this study, and is composed of red and gren metaclastics with conglomerate and rhyolite intercalations and limestone lenses in the lower part, and recrystallized limestones in the upper part. The Bornova melange of the İzmir-Ankara zone tectonically overlays both the Menderes massif and is represented by an ophiolitic complex. The mafic volcanic rocks found in the Bornova melange are alkaline and subalkaline basalts. Tectonic setting diagrams show that they mostly have affinity with the the ocean-floor basalts, the calc-alkaline basalts and mid-ocean ridge basalts. The structures in the uppermost part of the Menderes massif and the lower part of the Akhisar nappe are mainly described and studied. Along this zone the kinematic indicators associated with stretching lineation and foliation indicate a top-to-the northeast sense of shear during the emplacement of the Akhisar nappe on the Menderes massif. Keywords: İzmir-Ankara Zone, Menderes Massif, Lycian Nappes, Bornova Melange, Akhisar Nappe.