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Early Triassic potassic volcanism in the Afyon Zone of the Anatolides/Turkey: implications for the rifting of the Neo-Tethys

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Abstract

Afyon Zone, which was derived from the Anatolide–Tauride platform during closure of the Neo-Tethys, is made up of pre-Mesozoic basement and unconformably overlying Triassic–Early Tertiary cover series. The Afyon Zone contains widespread metavolcanic rocks, which are dominated by rhyolite, dacite, and trachyandesite. They form a distinct volcanic succession, which is separated from the underlying Silurian–Lower Carboniferous metacarbonates and meta-siliciclastics by a regional unconformity. Trachyandesitic metavolcanics are made up of massive lava flows, pyroclastics and epiclastics, less frequently, domes and dikes, which were developed on a deeply eroded subaerial landmass. U/Pb and Pb/Pb zircon geochronology yielded Lower Triassic (~250 Ma) ages, which are interpreted as extrusion age of trachyandesitic volcanics. Based on the stratigraphic, geochronological, and geochemical data, we suggest that these Lower Triassic magmatic rocks represent an extensional tectonic setting on the northern active margin of the Gondwana, which led to the development of the northern branch of the Neo-Tethys.

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Acknowledgments

The authors wish to thank Mümtaz Çolak and Cumhur Kocabaş for X-Ray diffraction analyses of sanidine phenocrysts, separated from meta-trachyandesites, at Izmir Institute of Technology and the Engineering Faculty of Dokuz Eylul University/Turkey. This work was supported through the Scientific and Technological Research Council of Turkey (TUBİTAK) within the project number 103Y011.

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Authors and Affiliations

  1. Dokuz Eylül Üniversitesi, Mühendislik Fakültesi, Jeoloji Mühendisliği Bölümü, 35160, Tınaztepe, Buca, İzmir, Turkey

    Cüneyt Akal, Osman Candan & O. Ersin Koralay

  2. Institüt für Erd- und Umweltwissenschaften, Universität Potsdam, 14476, Potsdam-Golm, Germany

    Roland Oberhänsli

  3. Institute of Geology and Geophysics Chinese Academy of Sciences, P.O. Box. 9825, 100029, Beijing, China

    Fukun Chen

  4. Earth System Science Research Centre, Institute for Geosciences, University of Mainz, Becherweg 21, 55099, Mainz, Germany

    Dejan Prelević

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  1. Cüneyt Akal
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  2. Osman Candan
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  3. O. Ersin Koralay
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  4. Roland Oberhänsli
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  5. Fukun Chen
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Correspondence to Cüneyt Akal.

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Akal, C., Candan, O., Koralay, O.E. et al. Early Triassic potassic volcanism in the Afyon Zone of the Anatolides/Turkey: implications for the rifting of the Neo-Tethys. Int J Earth Sci (Geol Rundsch) 101, 177–194 (2012). https://doi.org/10.1007/s00531-011-0654-2

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