Early Triassic potassic volcanism in the Afyon Zone of the Anatolides/Turkey: implications for the rifting of the Neo-Tethys |
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| Authors: | Cüneyt Akal Osman Candan O Ersin Koralay Roland Oberhänsli Fukun Chen Dejan Prelevi? |
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| Institution: | 1.Dokuz Eylül üniversitesi,Mühendislik Fakültesi, Jeoloji Mühendisli?i B?lümü,T?naztepe, Buca,Turkey;2.Institüt für Erd- und Umweltwissenschaften,Universit?t Potsdam,Potsdam-Golm,Germany;3.Institute of Geology and Geophysics Chinese Academy of Sciences,Beijing,China;4.Earth System Science Research Centre, Institute for Geosciences,University of Mainz,Mainz,Germany |
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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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