Geochemistry of the Middle Miocene Collision-related Yamadagi (Eastern Anatolia) Calc-alkaline Volcanics, Turkey


EKİCİ T. , ALPASLAN M., PARLAK O., UÇURUM A.

TURKISH JOURNAL OF EARTH SCIENCES, cilt.18, ss.511-528, 2009 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 18 Konu: 4
  • Basım Tarihi: 2009
  • Doi Numarası: 10.3906/yer-0712-1
  • Dergi Adı: TURKISH JOURNAL OF EARTH SCIENCES
  • Sayfa Sayıları: ss.511-528

Özet

Major, trace element and K-Ar age determinations are reported for a suite from the Yamadagi volcanics in the Eastern Anatolia. The exposed rocks mainly consist of medium-potassium calc-alkaline basaltic andesites, andesites and dacites. Petrographical data exhibit disequilibrium mineral textures, such as resorption of the ferromagnesian phases, clinopyroxene-mantled orthopyroxene, and sieve-textured plagioclases. The Yamadagi volcanics have a calkalkaline character, and trace element characteristics exhibit that the volcanics resemble subduction zone volcanics and/or volcanics assimilated by continental crust. K/Ar age determinations show that the Yamadagi volcanics were formed during the 12 +/- 0.5 - 15 +/- 0.5 Ma time interval. Geochemical characteristics of these volcanics can be attributed to complex petrogenetic processes, including magma mixing and crustal assimilation along with fractional crystallization.