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Abstract: Stratigraphic Evolution of the Campanian-Paleocene Autochthonous Succession of Southeast Anatolia, Turkiye

Ahmet Guven, Ahmet Dincer, M. Ergun Tuna, Tanyol Coruh

The Campanian-Paleocene succession, emplaced between the Mardin and Midyat groups of the southeast Anatolia, consists of 20 formations developed within five depositional sequences. These sequences evolved during the time intervals of the middle late Campanian, the late Campanian-early Maastrichtian, the middle-late Maastrichtian, the early-middle Paleocene and the late Paleocene respectively. Each sequence is represented by a succession of lowstand and highstand sediments. Therefore, transgressively started but repressively developed and unconformably separated successions were deposited in shallower parts of the basin, while a continuous sedimentation took place in the deeper areas which were always submergent.

Southeast Anatolia, being an extension of the shelf of the Arabian plate throughout the late Cretaceous, was eustatically deepened during the middle-late Campanian interval. A major tectonism affected the region and changed the paleogeographic configuration by creating a positive area in the north and a basin in the south after the late Campanian-early Maastrichtian time. A large portion of this basin filled with carbonates and clastics deposited during a transgressive and regressive episodes of the following periods. During the same interval, the positive areas of the north were eroded and leveled down. Eventually, a vast carbonate platform (Midyat Group) developed during the Eocene transgressions.

AAPG Search and Discovery Article #90956©1995 AAPG International Convention and Exposition Meeting, Nice, France