Geodynamic Evolution of Datça Basin Since the Pliocene
- 1Dokuz Eylül University, Engineering Faculty, Department of Geological Engineering, İzmir, Turkey (okmen.sumer@deu.edu.tr)
- 2Middle East Technical University, Department of Geological Engineering, 06800, Ankara, Turkey
- 3Afyon Kocatepe University, Department of Geological Engineering, 03200, Afyon, Turkey
- 4Earthquake Research and Implementation Center, Afyon Kocatepe University, 03200, Afyon, Turkey
- 5University of Bucharest, Geology and Geophysics, 050107, Bucharest, Romania
- 6Utrecht University, Department of Earth Sciences, 3584 CD Utrecht, The Netherlands
The slab edge processes related to the subduction of the African slab along the Aegean-Cyprian trench, beneath Anatolia, played a significant role in Cenozoic extension in western Anatolia. The Datça Basin, which includes various Late Miocene depositional environments characterised by continental to marine transitions, is a WSW-ESE trending asymmetric depression developed on the Datça Peninsula, which separates the Aegean and Eastern Mediterranean Seas at the SW corner of Anatolia. Presently, the region is seismically active and is dominated by the E-W-trending Gökova Graben in the north and the NE-SW-trending Pliny-Strabo Trench in the south. Here, we conduct high resolution integrated stratigraphic study, that includes biostratigraphy, magnetostratigraphy as well as kinematic studies involving paleostress analysis to unravel geodynamic evolution of the region within the context of Africa-Eurasia convergence.
Three prominent sequences separated by unconformities are recognised in the Datça Basin; i) facies associations related to alluvial fan to fluvio-lacustrine deposits of Pliocene age, ii) facies extending from alluvial fan to fluvio-deltaic to marine incursions interlayered with two air-fall ash deposits of Pleistocene age, and iii) alluvial fan to fluvial to marine coastal facies of the modern basin infill. Integration of available information and our findings indicate that the basin experienced three distinct deformation phases associated with reactivation of pre-existing structures since Pliocene. First, the Datça Basin was initially developed as a transtensional basin in Pliocene possibly due to strike-slip deformation related to the Pliny-Strabo Trench, then orthogonal extensional deformation dominated and the basin evolved into a superimposed half-graben as a result of NNE to NNW directed extensional strain and subsequently became a full graben under N-S directed extension by the late Pliocene onwards.
This research is supported by The Scientific and Technological Research Council of Turkey (TUBITAK) with Grant Number of 117R012.
Keywords: Integrated stratigraphy, kinematics, basin evolution, Datça Basin, Southwestern Anatolia
How to cite: Sümer, Ö., Şiş, F. S., İnce, M. D., Özkaymak, Ç., Tosun, L., Uzel, B., Stoica, M., Langereis, C., and Kaymakci, N.: Geodynamic Evolution of Datça Basin Since the Pliocene, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-4070, https://doi.org/10.5194/egusphere-egu2020-4070, 2020.