Modeling of Central Anatolian (Ankara and vicinity) Basins with Gravity and Magnetic Methods

Central Anatolian basins, which are boundend by the Pontides in the north and the K？r？ehir&Toros tectonic blocks to the south-southeast, geologically important structures in the region with sediment accumulations up to the present day to comprises subduction to collusion process (Senezoyik) in northern segment of the Neotethys Oceanic litosphere beneath to the Pontides. Within the scope of this study, these depositional structures, which are geographically located in Ankara and in the vicinity and classifield as the K？r？kkale-Bala, Alc？-Orhaniye, Haymana and Tüzg？lü basins in litreture. Although sedimentary deposition stages, lithological properties and source characteristics show great similarities, they are considered as different basins in terms of their today’s geographical positions. In this study, these basins were examined with gravity and magnetic methods and information about their structures in the depths of the earth were obtained. Especially, the Haymana and K？r？kkale-Bala basins were found to have the thickest sediment depositions in the region (about 8-9 km). The deep structures of the basins were modeled by gravity method and their possible connections with each other were determined. In particular, it has been tried to explain the ongoing debates in the literature that Tuzg？lü and Haymana basins were the same sedimentary basin in the past. Within the basin areas, no clear change in gravity data but high positive magnetic anomalies can be associated with the presence of volcanic units (Neogene) near beneath the surface. In addition, important data related to the evolution of tectonic deformation of the ？AESZ on these basins have been revealed. The information of the basins with this depth provides new perspective related with the geodynamic evolution of the region, especially considering the tectonic blocks they surround