Deformation in SW Anatolia (Turkey) Documented by Anisotropy of Magnetic Susceptibility Data

Gülyüz, Erhan
Langereis, Cor G.
Özacar, Atilla Arda
Kaymakcı, Nuretdin
Convergence between the Eurasian and the African plates in the West Anatolian-Aegean region results in a trench retreat due to slab roll-back and tearing of the subducted African lithosphere. The upper plate response of this process gave way to back-arc extension in the region. We have conducted a very detailed anisotropy of magnetic susceptibility (AMS) study on the Neogene rocks in SW Anatolia to unravel the style and magnitudes of deformation. For this purpose, from 83 sites in 11 structurally homogeneous domains, 1,680 paleomagnetic samples were analyzed. The results show that AMS fabrics are related to the tectonic deformation and that the magnetic lineation (maximum susceptibility axis, k1) is parallel to inferred maximum extension, while minimum susceptibility (k3) is typically normal to the bedding plane, corresponding to a preserved compaction associated with deposition fabric. The intermediate axis (k2) is parallel to a second extension direction and indicates that the region has been under the control of multi-directional extension during the Neogene. Two main magnetic lineation directions are identified and represent Oligocene to middle Miocene E-W, and late Miocene to Pliocene NW-SE oriented extension. The magnetic lineation directions are dominantly parallel or perpendicular to the general strikes of the normal faults. The results show that the deformation in the region resembles two differentially stretched rubber sheets under the influence of SW oriented extension, exerted by the southward retreating Eastern Mediterranean subduction system.


Active tectonics and kinematics of Fethiye-Göcek Bay, SW Turkey
Tosun, Levent; Kaymakcı, Nuretdin; Department of Geological Engineering (2018)
Tomographic studies conducted in Eastern Mediterranean region reveal that Pliny-Strabo Trench corresponds to a tear known as "STEP" (Subduction Transform Edge Propagator) fault connecting the Aegean and Cyprean trenches along the northern edge of the northward subducting African lithosphere. Recently, it is claimed that Fethiye-Burdur Fault Zone, which interpreted as a sinistral transtensional shear zone, is the northeaster continuation of this fault. In order to test this hypothesis, a rigorous study aimin...
Active tectonics and kinematics of Fethiye-Göcek Bay, SW Turkey: Insight about the eastern edge of Pliny-Strabo Trenches
Tosun, Levent; Avşar, Ulaş; Avşar, Özgür; Dondurur, Derman; Kaymakcı, Nuretdin (2021-04-01)
© 2021 Elsevier LtdPliny-Strabo Trench (PST)is a Subduction Transform Edge Propagator (STEP) fault developed at the northern edge of the African oceanic lithosphere connecting the Aegean and Cyprian trenches in the eastern Mediterranean. Recent studies have demonstrated that the PST terminates close to Turkish Border and links to the Cyprian trench east of Rhodes and south of Fethiye-Göcek Bay. However, it is also claimed that the PST extends into SW Anatolia along a sinistral transtensional shear zone, so-...
Paleomagnetic evidence for upper plate response to a STEP fault, SW Anatolia
Kaymakcı, Nuretdin; ÖZKAPTAN, MURAT; Özacar, Atilla Arda; UZEL, BORA; SÖZBİLİR, HASAN (Elsevier BV, 2018-09-15)
Pliny-Strabo Trench is a Subduction Transform-Edge Propagator (STEP) Fault developed on the northern edge of the subducted African Oceanic Lithosphere. It connects the Aegean and Cyprian trenches in the Eastern Mediterranean convergent system. Although, deep geometry of the STEP fault and associated slab tear in mantle are imaged, its shallow vertical and lateral continuation in the crust and impact on the over-riding plate are still unknown. Thus, we have studied SW Anatolia, the candidate site where this ...
Analysis of seismic anisotropy across Central Anatolia by shear wave splitting
Pamir, Dilekcan; Özacar, Atilla Arda; Department of Geological Engineering (2014)
Central Anatolia plays a significant role to connect the theories on the ongoing tectonic escape, the African Plate subduction along Cyprus Arc and the collision of Arabian Plate along Bitlis Suture. On the other hand, the shear wave splitting measurements which characterize the seismic anisotropy are very sparse in the region. The seismic data recorded by national seismic networks with a denser coverage provides a unique opportunity to analyze the effect of present slab geometry (slab tears, slab break-off...
Segmented African lithosphere beneath the Anatolian region inferred from teleseismic P-wave tomography
Biryol, C. Berk; Beck, Susan L.; Zandt, George; Özacar, Atilla Arda (2011-03-01)
P>Lithospheric deformation throughout Anatolia, a part of the Alpine-Himalayan orogenic belt, is controlled mainly by collision-related tectonic escape of the Anatolian Plate and subduction roll-back along the Aegean Subduction Zone. We study the deeper lithosphere and mantle structure of Anatolia using teleseismic, finite-frequency, P-wave traveltime tomography. We use data from several temporary and permanent seismic networks deployed in the region. Approximately 34 000 P-wave relative traveltime residual...
Citation Formats
M. ÖZKAPTAN, E. Gülyüz, B. UZEL, C. G. Langereis, A. A. Özacar, and N. Kaymakcı, “Deformation in SW Anatolia (Turkey) Documented by Anisotropy of Magnetic Susceptibility Data,” Tectonics, vol. 40, no. 12, pp. 0–0, 2021, Accessed: 00, 2022. [Online]. Available: