Turhan AYYILDIZ, Mine Sezgül KAYSERİ ÖZER, Koray SÖZERİ, Grégoire MÉTAIS, Baki VAROL, Şevket ŞEN, Recep Hayrettin SANCAY

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Paleoenvironment of the Late Oligocene from the Kağızman-Tuzluca Basin (northeastern Anatolia) based on the micro- and macrofloras

Paleoenvironment of the Late Oligocene from the Kağızman-Tuzluca Basin (northeastern Anatolia) based on the micro- and macrofloras

The Kağızman-Tuzluca Basin in East Anatolia is still poorly documented for its stratigraphy and in particular its paleofloralassemblages. In this study, the microfloras from the Kağızman-Kötek and Kömürlü areas and the macroflora from the Tuzluca area inthis basin have been defined to overcome this deficiency. Sedimentary sequences of the Kağızman-Kömürlü area have been depositedin terrestrial conditions different from the sequences of the Kağızman-Kötek and Tuzluca areas, which were deposited in brackishconditions near a shallow marine environment. Paleovegetation in eastern Anatolia is represented by mixed mesophytic and coniferousforests restricted to high and middle altitudes (e.g.Pinus ,Ulmus , Fagaceae,Engelhardia ,Sequoia ,Zelkova , Lauraceae,Pterocarya , andQuercus ). Open vegetation elements (Asteraceae-Asteroideae,Tubulifloriditesspp., Poaceae, and Umbelliferae) in East Anatolia aremore predominant than in West Anatolia. The presence of some marine dinoflagellates andCalamus , Lauraceae, and Arecaceae suggestsnear-seaside plant distribution in the Kağızman-Kötek and Tuzluca areas. According to micro- and macrofloral records and numericalclimatic values calculated by the coexistence approach method, paleoclimatic conditions could have changed between warm temperateand subtropical, and also seasonality was effective in East Anatolia during the Late Oligocene. In addition, the paleoclimate of EastAnatolia during the Late Oligocene appears to be colder than in West Anatolia based on the palynological data, and this could be relatedto the high elevation of East Anatolia as compared to West Anatolia. Moreover, the low precipitation values of East Anatolian indicate adry period in the paleoclimatic conditions of the Late Oligocene.
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  • Yayın Aralığı: Yılda 6 Sayı
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