LATE NEOGENE UPLIFT ASSOCIATED WITH THE NORTH ANATOLIAN FAULT IN THE CENTRAL PONTIDES; THE NORTHERN MARGIN OF THE CENTRAL ANATOLIAN PLATEAU, TURKEY

In the context of the margin evolution of the Central Anatolian Plateau, we address the mode and timing of the uplift in the Central Pontides. We present morphometric analyses, interpret published geodetic and seismic reflection data as well as structural and geomorphic field observations. Our regional morphometric analyses reveal regional topographic anomalies, steep channel gradients, and local high relief areas as proxies for ongoing differential surface uplift, which is higher in the western sector of the Central Pontides. The results from NAF-normal components of geodetic slip vectors indicate that regional stress is accumulated in the broad restraining bend of the NAF, and seismic reflection and structural field data indicate a deeper structural detachment horizon that creates an active orogenic wedge with a northward polarity and a positive flower structure geometry across the Central Pontides. Our tectonic concept implies that the NAF is the main driving force for wedge tectonics and uplift in the Central Pontides. The syn-tectonic deposits within the inverted basins and deeply incised gorges of the Kızılırmak and Filyos rivers imply that the formation of relief, changes in sedimentary dynamics, and >1400 m and 1200 m, respectively fluvial incision were the consequences of accelereated uplift starting in the early Pliocene. The Central Pontides thus provide an example of the initial to intermediate stage of continental plateau evolution, when the role of surface breaking faults plays a critical role in margin growth and sedimentary basin evolution.