An example of an accretionary forearc basin from northern Central Anatolia and its implications for the history of subduction of Neo-Tethys in Turkey

摘要: Deformed sedimentary sequences of Late Cretaceous-middle Eocene age located between the Sakarya continent and Anatolian Complex have been interpreted as fill a forearc basin. The history structure this basin are critical for understanding evolution Neo-Tethyan subduction in Middle East. I test elaborate upon interpretation on basis three basic outcrop areas Upper Cretaceous-lower Tertiary confined to northeast-southwest-trending belt north-west Ankara. These Alci, Kinik Orhaniye areas. They expose two different called Alci Orhaniye. In area, sequence starts at base with continental red clastic rocks erosional surface an underlying ophiolitic melange continues upward into shallow-marine reefal buildup late Maastrichtian age. upper half is separated from its lower by local disconformity dominated debris-flow deposits composed mostly volcanic material. By contrast, both characterized thick, continuous coarsening-upward overlying conformably melange. deep-marine flysch, middle part material, topmost buildup. Lower contact relationships, lithologic composition, facies distribution, internal structures, regional tectonic settings strongly suggest that above-mentioned outcrops preserve remnants peripheral accretionary forming north-northwestern margin Haymana-Polath during Campanian-middle time. This here named "Orhaniye basin."