Browsing by Author "Erturac, Mehmet Korhan"

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Comparative Study of the Marine Terraces Along the Bulgarian and Turkish Black Sea Coasts for Determination of the Tectonic Effect and Environmental Change
(Bulgarian Acad Science, 2021) Kostov, Konstantin; Erturac, Mehmet Korhan; Nakov, Radoslav; Kazanci, Nizamettin; Lazarova, Anna; Sahiner, Eren; Okur, Hilal
Evaluation of the Plio-Quaternary Tectonic Stress Regime From Fault Kinematic Analysis in the Lake Van Basin (Eastern Anatolia)
(Pergamon-elsevier Science Ltd, 2020) Selcuk, Azad Saglam; Erturac, Mehmet Korhan; Sunal, Gursel; Cakir, Ziyadin
We focus on the Neogene-Quaternary tectonic evolution of the Lake Van Basin located within the Turkish-Iranian Plateau. To better understand the complex tectonic history of the region and determine the paleostress patterns, we investigate and report on the geometric, structural, and kinematic characteristics of the Basin based on field observations of fault-slip orientations which are classified according to radiometric ages of the basin stratigraphy. The analysis of large-scale structures and fault kinematics indicate that three different deformation phases prevailed in the Lake Van Basin during the Neogene-Quaternary periods. Phase 1 is characterized by NW-SE extension and NE-SW contraction that gave rise to the development of strike-slip faults with thrust or normal components during the late Miocene, deforming the fluvial sediments which expose at east/northeast of the Basin. Phase 2 is characterized in fluvial and lake deposits of the Middle Pleistocene, deformed by dominant contraction stress regime effective along NW-SE direction. The late Pleistocene tectonic regime (Phase 3) consists of transpressional deformation that develops under NNW-SSE compression and ENE-WSW extension. According to our analysis, the present-day deformation pattern of the Lake Van Basin is dominated by compression at east, while at the northern part is transtensional.
The Quaternary Climatic and Tectonic Development of the Murat River Valley (Mus Basin, Eastern Turkey) as Recorded by Fluvial Deposits Dated by Optically Stimulated Luminescence
(Mdpi, 2021) Avsin, Nurcan; Erturac, Mehmet Korhan; Sahiner, Eren; Demir, Tuncer
The paper describes climatic and tectonic effects on fluvial processes of East Anatolia. This study from the Mus Basin contains three alluvial terrace levels (T3-T1) ranging from 30-35 m to 3-5 m above the present Murat River in its middle section. In order to provide a chronology for the evaluation of the significant, effects of climatic changes and tectonic uplift, we used optically stimulated luminescence (OSL) dating of the river deposits of the youngest (T3) and medium terrace (T2). The ages from these terrace deposits show that the T3 has formed approximately 6.5 ka ago, i.e., during the last part of the Holocene (MIS 1) and T2 has formed nearly 25 ka ago, i.e., during MIS 2 at the ending of the last glacial period. According to these results, it appears that the Murat River established its terrace sequences both in cold and warm periods. The variations in climate oriented fluvial evolution between the East Anatolia fluvial system and the temperate-periglacial fluvial systems in Europe may be the conclusion of different vegetation cover and melting thicker snow coverings in cold periods.