Geochemistry and geochronology of orthogneisses in the Derbent (Alaşehir) area, eastern part of the Ödemiş-Kiraz submassif, Menderes Massif: Pan-African magmatic activity

KORALAY O. E., DORA O., Chen F., Satir M., CANDAN O.

Turkish Journal of Earth Sciences, cilt.13, sa.1, ss.37-61, 2004 (Scopus, TRDizin) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 13 Sayı: 1
  • Basım Tarihi: 2004
  • Dergi Adı: Turkish Journal of Earth Sciences
  • Derginin Tarandığı İndeksler: Scopus, TR DİZİN (ULAKBİM)
  • Sayfa Sayıları: ss.37-61
  • Anahtar Kelimeler: Geochemistry, Menderes Massif, Orthogneiss, Pan-African, Pb-Pb zircon dating, Turkey
  • Dokuz Eylül Üniversitesi Adresli: Evet

Özet

Pan-African basement rocks and the Palaeozoic cover series of the Menderes Massif are exposed around Derbent (Alaşehir) in the eastern part of the Ödemiş-Kiraz submassif. Garnet-mica schists of the Pan-African basement are intruded by the protoliths of orthogneisses and Triassic leucocratic orthogneisses. This study focuses on the geochronology and geochemistry of orthogneisses related to the Pan-African evolution of the Menderes Massif in latest Proterozoic time. Geochemical data suggest that the orthogneisses were derived from S-type, peraluminous, syn- to post-collisional granitoids of calc-alkaline affinity. Zircon grains from the orthogneisses, which are euhedral with typical igneous morphologies, were dated by the Pb-Pb evaporation method. Single zircon ages of two samples yielded 207Pb/206Pb ages of 561.5±1.8 Ma and 570.5±2.2 Ma. These ages are interpreted as the time of protolith emplacement of the orthogneisses. This major magmatic episode of the Menderes Massif can be attributed the Pan-African Orogeny which was related to the closure of the ocean basins and amalgamation of East and West Gondwana. Copyright © TÜBİTAK.