Timing of neotectonic fracturing by fission track dating of obsidian in-filling faults in the İkizdere–Rize area, NE Black Sea region, Turkey |
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| Authors: | ZehraYe&#;ingil Durmu&#;Boztu&#; MuratEr MassimoOddone & GiulioBigazzi |
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| Institution: | Department of Physics, Faculty of Arts and Sciences, Çukurova University, 01330 Adana, Turkey,;Department of Geological Engineering, Cumhuriyet University, 58140 Sivas, Turkey,;MTA Doğu Karadeniz Bölge Müdürlüğü, Trabzon, Turkey,;Department of General Chemistry, University of Pavia, viale Taramelli 12, 27100 Pavia, ltaly,;Institute of Geochronology and Isotope Geochemistry, C.N.R., via Alfieri 1, 56010 Ghezzano (Pisa), ltaly |
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| Abstract: | There are several NE–SW- and NNW–SSE-trending sets of neotectonic faults that are infilled with obsidians in the İkizdere–Rize district of the NE Black Sea region, Turkey. Using the fission-track technique, it is estimated that these fracture-filling obsidians were formed between 1.73 ± 0.10 and 1.93 ± 0.15 Ma. This short period is consistent with a unique eruption, and is supported by petrographic and geochemical data that reveal very homogenous characteristics. Although existing literature data indicate that these faults are part of the early Pliocene neotectonic fracture system in this region, the determination of latest Pliocene–Pleistocene formation for the İkizdere obsidians better constrains its timing. |
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