40Ar/39Ar dating of ignimbrites and plinian air-fall layers from Cappadocia,Central Turkey: Implications to chronostratigraphic and Eastern Mediterranean palaeoenvironmental record |
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| Institution: | 1. Laboratoire de géologie, Ecole Normale Supérieure, UMR CNRS 8538, 24 rue Lhomond, 75005 Paris, France;2. UPMC Univ. Paris 06, ISTEP F-75005, Paris, France;3. CNRS, UMR 7193, F-75005, Paris, France;4. IUF, F-75005 Paris, France;5. Eurasia Institute of Earth Sciences and Department of Geology, Istanbul Technical University, Maslak, 34469 Istanbul, Turkey;1. Department of Geology, Cumhuriyet University, 58140 Sivas, Turkey;2. Department of Geophysics, Cumhuriyet University, 58140 Sivas, Turkey;3. Geomagnetism Laboratory, Geology and Geophysics, School of Environmental Sciences, University of Liverpool, Liverpool L69 7ZE, UK;1. Van Yüzüncü Y?l University, Faculty of Architecture and Engineering, Department of Mining Engineering, Zeve Campus, 65080 Van, Turkey;2. Istanbul University, Faculty of Engineering, Department of Geological Engineering, 34320 Avc?lar, Istanbul, Turkey;3. Russian Academy of Sciences, Institute of the Ore Deposits Geology, Petrology, Mineralogy and Geochemistry, Moscow, Russia;1. Yüzüncü Y?l University, Department of Geological Engineering, TR-65100 Van, Turkey;2. Sakarya University, Department of Geography, TR-54187, Sakarya, Turkey;3. Laboratoire des Sciences du Climat et de l’''Environnement, CEA/CNRS/UVSQ et Université Paris-Saclay, Gif-Sur-Yvette, France;1. Department of Earth Sciences, Utrecht University, Utrecht, the Netherlands;2. Institute of Geological Sciences, Freie Universität Berlin, Berlin, Germany;3. Department of Geological Engineering, Van Yüzüncü Y?l University, Van, Turkey |
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| Abstract: | Magmatism forming the Central Anatolian Volcanic Province of Cappadocia, central Turkey, records the last phase of Neotethyan subduction after ～11 Ma. Thirteen large calc-alkaline ignimbrite sheets form marker bands within the volcano-sedimentary succession (the Ürgüp Formation) and provide a robust chronostratigraphy for paleoecologic evaluation of the interleaved paleosols. This paper evaluates the chronologic record in the context of the radiometric, magnetostratigraphic and lithostratigraphic controls. Previous inconsistencies relating primarily to K/Ar evidence were reason for the initiation of an integrated study which includes 40Ar/39Ar dating, palaeomagnetic and stratigraphic evidence. The newly determined 40Ar/39Ar-ages (Lepetit, 2010) are in agreement with Ar/Ar and U/Pb data meanwhile published by Pauquette and Le Pennec (2012) and Aydar et al. (2012). The 40Ar/39Ar-ages restrict the end of the Ürgüp Formation to the late Miocene. The paleosol sequence enclosed by the ignimbrites is thus restricted to the late Miocene, the most intense formation of pedogene calcretes correlating with the Messinian Salinity Crisis. |
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| Keywords: | Tephrostratigraphy Neogene Cappadocia Turkey |
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