İzmir‐Ankara suture as a Triassic to Cretaceous plate boundary – data from central Anatolia

摘要: The Izmir‐Ankara suture represents part of the boundary between Laurasia and Gondwana along which a wide Tethyan ocean was subducted. In northwest Turkey, it is associated with distinct oceanic subduction‐accretion complexes Late Triassic, Jurassic Cretaceous ages. Triassic accretion consist predominantly basalt lesser amounts shale, limestone, chert, Permian (274 Ma zircon U‐Pb age) metagabbro serpentinite, have undergone greenschist facies metamorphism. Ar‐Ar muscovite ages from phyllites range 210 down to 145 broad southward younging. complex, ophiolitic melange, consists basalt, radiolarian shale minor recrystallized serpentinite greywacke, showing various degrees blueschist metamorphism penetrative deformation. phengite two metabasites are ca. 80 (Campanian). melange includes large peridotite‐gabbro bodies plagiogranites 180 Geochronological geological data show that lithosphere subducted north under Pontides Cretaceous. This period characterized generally by subduction‐accretion, except in Early Cretaceous, when subduction‐erosion took place. Sakarya segment all subduction complexes, as well adjacent continental sequences, unconformably overlain Lower Eocene red beds. This, stratigraphy Zone indicate hard collision Anatolide‐Tauride Block place Paleocene.