Petrochemistry of the Oyaca-Kedikayasi (Ankara) dacites as evidence for the post-collisional tectonic evolution of north-central Anatolia, Turkey

Bozkurt E., Kocyigit A., Winchester J., Holland G., Beyhan A.

GEOLOGICAL JOURNAL, vol.34, no.3, pp.223-231, 1999 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 34 Issue: 3
  • Publication Date: 1999
  • Doi Number: 10.1002/(sici)1099-1034(199907/09)34:3<223::aid-gj823>;2-b
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.223-231
  • Keywords: Ankara, central Anatolia, Turkey, dacites, post-collisional, DISCRIMINATION, ROCKS
  • Middle East Technical University Affiliated: Yes


The Lower Miocene Oyaca and Kedikayasi dacite stocks, unconformably overlain by Plio-Quaternary sedimentary and volcanic rocks, intrude a southward-verging imbricate thrust zone within the izmir-Ankara-Erzincan Suture Zone (IAESZ), approximately 50 km SW of Ankara. These stocks crop out as two petrographically distinguishable plagioclase, hornblende and biotite-phyric dacites. Xenoliths petrographically similar to the Kedikayasi dacite occur within the Oyaca stock, suggesting that the Kedikayasi stock is older; if so, the venting from the magma chamber may have removed the upper, more evolved magma first.