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Journal of the Geological Society; 2003; v. 160; issue.6; p. 947-962;
DOI: 10.1144/0016-764902-125
© 2003 Geological Society of London

Original Article

Neotethyan ophiolitic rocks of the Anatolides of NW Turkey and comparison with Tauride ophiolites

A. Piril Önen

Department of Geological Engineering, Middle East Technical University, Ankara 06531, Turkey (e-mail: piril@metu.edu.tr)

The I2zmir–Ankara–Erzincan zone in Turkey is part of the Anatolide belt. In NW Anatolia, near Kütahya, the ophiolitic rocks within the I2zmir–Ankara–Erzincan suture zone have a tholeiitic character and oceanic back-arc chemistry. Amphibolites form a metamorphic sole to part of the ophiolite in the Kütahya region and yield an 40Ar/39Ar age of 93 ± 2 Ma, interpreted to record high-grade metamorphism and intra-oceanic thrusting of pre-existing ocean crust. Gabbros and dykes yield 40Ar/39Ar ages of 94 ± 13 Ma and 48 ± 12 Ma. The first is suggested to be the ophiolite formation age, and the second a regional metamorphic event. The ophiolitic rocks of the Kütahya region are composite and record several events in the evolution of a Neotethyan seaway situated in north–central Anatolia and farther east. They are interpreted to have formed in a small ocean basin marginal to the subducting I2zmir–Ankara–Erzincan ocean. The Kütahya ophiolites of the Anatolide belt are similar in age to the Tauride ophiolites, and the sub-ophiolite metamorphic rocks and dykes in the ultramafic parts of the ophiolites in the Anatolide–Tauride Block formed at the same intraoceanic subduction zone within the same Neotethyan ocean.

Key Words: Neotethyan • I2zmir–Ankara–Erzincan zone • ophiolites • back-arc basins




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