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

AKAL C., CANDAN O., KORALAY O. E., Oberhaensli R., Chen F., Prelevic D.

INTERNATIONAL JOURNAL OF EARTH SCIENCES, cilt.101, sa.1, ss.177-194, 2012 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 101 Sayı: 1
  • Basım Tarihi: 2012
  • Doi Numarası: 10.1007/s00531-011-0654-2
  • Dergi Adı: INTERNATIONAL JOURNAL OF EARTH SCIENCES
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.177-194
  • Anahtar Kelimeler: Meta-trachyandesite, Afyon Zone, Turkey, Neo-Tethys, Paleo-tethys, EASTERN MEDITERRANEAN REGION, GEOCHEMICAL DISCRIMINATION, TURKEY, EVOLUTION, ROCKS, KONYA, DEFORMATION, CONSTRAINTS, SUBDUCTION, ZIRCON
  • Dokuz Eylül Üniversitesi Adresli: Evet

Özet

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 (similar to 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.