Collision Chronology Along the Izmir-Ankara-Erzincan Suture Zone: Insights From the Saricakaya Basin, Western Anatolia

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Date

2019-10-01

Author

Mueller, M. A.
Licht, A.
Campbell, C.
Ocakoglu, F.
Taylor, M. H.
Burch, L.
Ugrai, T.
Kaya, Muhammed Çağrı
Kurtoglu, B.
Coster, P. M. C.
Metais, G.
Beard, K. C.

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Debate persists concerning the timing and geodynamics of intercontinental collision, style of syncollisional deformation, and development of topography and fold-and-thrust belts along the >1,700-km-long Izmir-Ankara-Erzincan suture zone (IAESZ) in Turkey. Resolving this debate is a necessary precursor to evaluating the integrity of convergent margin models and kinematic, topographic, and biogeographic reconstructions of the Mediterranean domain. Geodynamic models argue either for a synchronous or diachronous collision during either the Late Cretaceous and/or Eocene, followed by Eocene slab breakoff and postcollisional magmatism. We investigate the collision chronology in western Anatolia as recorded in the sedimentary archives of the 90-km-long Saricakaya Basin perched at shallow structural levels along the IAESZ. Based on new zircon U-Pb geochronology and depositional environment and sedimentary provenance results, we demonstrate that the Saricakaya Basin is an Eocene sedimentary basin with sediment sourced from both the IAESZ and Sogut Thrust fault to the south and north, respectively, and formed primarily by flexural loading from north-south shortening along the syncollisional Sogut Thrust. Our results refine the timing of collision between the Anatolides and Pontide terranes in western Anatolia to Maastrichtian-Middle Paleocene and Early Eocene crustal shortening and basin formation. Furthermore, we demonstrate contemporaneous collision, deformation, and magmatism across the IAESZ, supporting synchronous collision models. We show that regional postcollisional magmatism can be explained by renewed underthrusting instead of slab breakoff. This new IAESZ chronology provides additional constraints for kinematic, geodynamic, and biogeographic reconstructions of the Mediterranean domain.

Subject Keywords

Detrital zircons, Eocene, Collision, Geochronology, Anatolia

URI

https://hdl.handle.net/11511/30873

Journal

TECTONICS

DOI

https://doi.org/10.1029/2019tc005683

Collections

Graduate School of Natural and Applied Sciences, Article

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Citation Formats

M. A. Mueller et al., “Collision Chronology Along the Izmir-Ankara-Erzincan Suture Zone: Insights From the Saricakaya Basin, Western Anatolia,” TECTONICS, pp. 3652–3674, 2019, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/30873.