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Luminescence dating of Quaternary marine terraces from the coastal part of Eastern Black Sea and their tectonic implications for the Eastern Pontides, Turkey

The timing of the deposition of the well-preserved Quaternary marine terraces in the coastal region of northeastern Turkey are crucial in understanding the Quaternary tectonics of the Pontides. The chronology of raised marine terraces between Trabzon and Rize has remained unrevealed because of chronologic limitations. This study aims to establish chronology for the terrace deposits by applying optically stimulated luminescence (OSL) dating methods using single aliquot regenerative dose (SAR) techniques on quartz grains extracted from marine terraces. | Turkish Journal of Earth Sciences Turkish J Earth Sci 2021 30 359-378 http journals.tubitak.gov.tr earth TÜBİTAK Research Article doi 10.3906 yer-2005-21 Luminescence dating of Quaternary marine terraces from the coastal part of Eastern Black Sea and their tectonic implications for the Eastern Pontides Turkey Mustafa SOFTA1 2 Joel Q. G. SPENCER2 Hasan SÖZBİLİR1 Sebastien HUOT3 Tahir EMRE1 1 Department of Geology Dokuz Eylül University İzmir Turkey 2 Department of Geology Kansas State University Manhattan KS USA 3 Illinois State Geological Survey University of Illinois at Urbana-Champaign Champaign IL USA Received 18.05.2020 Accepted Published Online 03.01.2021 Final Version 17.05.2021 Abstract The timing of the deposition of the well-preserved Quaternary marine terraces in the coastal region of northeastern Turkey are crucial in understanding the Quaternary tectonics of the Pontides. The chronology of raised marine terraces between Trabzon and Rize has remained unrevealed because of chronologic limitations. This study aims to establish chronology for the terrace deposits by applying optically stimulated luminescence OSL dating methods using single aliquot regenerative dose SAR techniques on quartz grains extracted from marine terraces. Eleven samples were collected from the lowest three Quaternary marine terraces. The OSL ages clusters into three groups 52.4 4.6 to 60.0 4.7 ka terrace level T1 16.8 0.8 to 33.9 2.8 ka T2 and 11.7 0.9 ka T3 . This chronology is consistent with the classical terrace stratigraphy i.e. younger terraces are located at lower elevations and vice versa for the older terraces. We correlate the established terrace chronology with MIS 3c MIS 3a and MIS 1. We calculated apparent uplift rates are 0.98 0.12 mm year 1.39 0.26 mm year and 1.50 0.78 mm year from marine terrace levels 1 2 and 3 respectively. Based on the existing eustatic sea-level data curve we estimated tectonic uplift rates up to 5 mm per year. Our results indicate that the .