Two-stage felsic volcanism in the western part of the southeastern Anatolian orogen: Petrologic and geodynamic implications


Yilmaz H., Alpaslan M., Temel A.

INTERNATIONAL GEOLOGY REVIEW, cilt.49, ss.120-141, 2007 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 49 Konu: 2
  • Basım Tarihi: 2007
  • Doi Numarası: 10.2747/0020-6814.49.2.120
  • Dergi Adı: INTERNATIONAL GEOLOGY REVIEW
  • Sayfa Sayıları: ss.120-141

Özet

We describe the petrogenesis of three phases of Late Oligocene to Middle Miocene felsic volcanism that occurred in the western part of the southeastern Anatolian orogen. All units are calcalkaline. The S-type character of these volcanic rocks is supported by their peraluminous natures (A/CNK 1.11-3.14) and high (up to 9.89%) normative corundum contents. Elevated Rb/Sr ratios and low MgO and Fe2O3 total of the first phase suggest that it might represent melts lacking entrained Fe-Mg-rich crystals, and that the magma developed by muscovite-dehydration melting. Relatively lower Rb/Sr ratios and higher Ba, Sr and Eu concentrations, and high zircon-saturation temperatures of the last two phases, indicate that these melts formed by water-saturated melting.