The Kiziltepe ophiolitic thrust sheet in the Bolkar Mountains of Turkey occurs between two subparallel ophiolite belts bounding the Tauride carbonate platform and represents a remnant of the Cretaceous Neo-Tethyan oceanic lithosphere. It is underlain by foliated amphibolite that represents a metamorphic sole developed at the inception of an intra-oceanic subduction zone in the Neo-Tethys ∼92-90 Ma. Blueschist-facies overprinting of the amphibolite indicates that the metamorphic sole was dragged deeper into the subduction zone where it experienced increasing P/T with cooling. Regional tectonic constraints suggest a Maastrichtian age for the timing of this blueschist-facies metamorphism. Sodic amphibole-rich veins and crossite/Mg-riebeckite rims on hornblende suggest that growth of blueschist-facies minerals was facilitated by infiltration of fluid along fractures and grain boundaries. We infer a counterclockwise P-T-t trajectory during which metamorphism was accompanied/succeeded by rapid uplift along the northern edge of the Tauride belt in Late Cretaceous-early Tertiary time.
Bibliographical noteFunding Information:
This study is supported by grants from the NSF (EAR-9219064 to Y. Dilek and EAR-9317100 to D.L. Whitney), Vassar College Faculty Research Funds, and Miami University manuscript preparation funds. 4°Ar/39Ar dating of amphibolites and dike rocks was done by Brad Hacker at Stanford University. Critical and constructive reviews of an early version by Virginia Sisson, Robert Coleman, and John Platt improved the paper. We thank Edwin Brown and Rebecca Jamieson for their thorough reviews for Tectonophysics.
- Eastern Mediterranean region
- Geology of Turkey
- Metamorphic sole
- P-T-t trajectory