Palaeomagnetic and geochronological evidence for a major middle Miocene unconformity in Soke Basin (western Anatolia) and its tectonic implications for the Aegean region

Date

2017-07-01

Author

UZEL, BORA
SÜMER, ÖKMEN
ÖZKAPTAN, MURAT
ÖZKAYMAK, ÇAĞLAR
Kuiper, Klaudia
SÖZBİLİR, HASAN
Kaymakcı, Nuretdin
İNCİ, UĞUR
Langereis, Cornelis G.

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Cenozoic convergence between the Eurasian and African plates and concurrent slab roll-back processes have produced a progressive extension in back-arc areas, such as the Aegean region and western Anatolia. There is still a long-standing controversy as to whether this was a continuous or stepwise process. To shed light on this controversy and on the driving mechanism of regional extension, we present palaeomagnetic and geochronological results from the Soke Basin located at the southeastern rim of the Izmir-Balikesir Transfer Zone. Our improved geochronology shows that volcanic activity in the region occurred between 11.66 and 12.85 Ma. Middle to late Miocene palaeomagnetic data for the Soke Basin show a c. 23 degrees clockwise rotation, whereas early Miocene data show a c. 28 degrees counterclockwise rotation. The primary nature of the magnetization is indicated by a positive tilt test. The resulting c. 51 degrees counterclockwise rotations during the middle Miocene signify a major tectonic reorganization, during a period when an interruption of exhumation of metamorphic massifs has been reported. We suggest that the Izmir-Balikesir Transfer Zone is the main driver of the reorganization in the region. The regional fingerprint of this tectonic reorganization coincides with the acceleration of trench retreat and illustrates the surface impact of tearing of the Hellenic slab.

Subject Keywords

Geomagnetic secular variation, Balikesir transfer zone, Mesozoic cover series, Central Turkey, Gediz graben, Neotectonic deformation, Fault zone, Continental lithosphere

URI

https://hdl.handle.net/11511/48201

Journal

JOURNAL OF THE GEOLOGICAL SOCIETY

DOI

https://doi.org/10.1144/jgs2016-006

Collections

Department of Geological Engineering, Article

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Citation Formats

B. UZEL et al., “Palaeomagnetic and geochronological evidence for a major middle Miocene unconformity in Soke Basin (western Anatolia) and its tectonic implications for the Aegean region,” JOURNAL OF THE GEOLOGICAL SOCIETY, pp. 721–740, 2017, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/48201.