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Tectonic Crossroads: Evolving Orogens of Eurasia-Africa-Arabia

Paper No. 1
Presentation Time: 08:30-18:30

DETERMINATION OF MAIN STRAND OF A STRIKE-SLIP FAULT BY USING SUBSIDIARY STRUCTURES: ESKISEHIR FAULT ZONE AS A CASE STUDY


SEYITOGLU, Gurol1, ESAT, Korhan1, TEMEL, Abidin2 and TELSIZ, Sevgi3, (1)Department of Geological Engineering, Tectonics Research Group, Ankara University, Tandogan, Ankara, 06100, Turkey, (2)Department of Geological Engineering, Hacettepe University, Beytepe Kampüsü, Ankara, 06532, Turkey, (3)Department of Geological Engineering, Hacettepe University, Beytepe Kampüsü, Ankara, 06532, Korhan.Esat@eng.ankara.edu.tr

Eskisehir Fault Zone is one of the important neotectonic structures of Turkey and extends from Bursa-Inegol to the west of Tuzgolu. Although most studied section lies between Bozuyuk and Eskisehir, there is no consensus on the structural style of the Eskisehir Fault Zone in this region. Some of the recent studies report the Eskisehir Fault as a transtensional structure whereas others suggest that earlier strike-slip faulting superimposed by younger normal faults.

On the contrary, our field observations on the subsidiary structures indicate an active right lateral strike-slip regime. Between Bozuyuk and Eskisehir, Riedel shear surfaces, overturned fold axes, small thrust surfaces, calcite filled open fractures and dyke systems indicate a theoretical main strand of strike-slip fault trending N 60-80 W. When this result is taken into account, two segments of the main strike-slip fault have been recognised between Bozuyuk and Eskisehir. In the NW of Inonu town, Sarisu Cayi is diverted 4.5 km right laterally by Bahcehisar segment. Further to east, the course of Sarisu Cayi is again deflected 18 km right laterally by en echelon Cukurhisar segment. Toward south, Porsuk river is also diverted right laterally by Kizilinler, Gokcekisik and Akcapinar segments. It is clear that E-W trending normal faults are not compatible with NW-SE trending right lateral strike-slip system. Indeed E-W trending Inonu fault is cut by N45W trending right lateral R shear in the Turkish Aeronautical Association Training Centre and the right lateral strike-slip faults control the drainage system of the region. All these data indicate that the E-W trending normal faults must belong to the earlier extensional tectonics and the region is under the influence of the current strike-slip tectonics.

This working hypothesis should be tested by geophysical methods especially on the Cukurhisar segment which is highly important to evaluate seismic risk of Eskisehir settlement.

Session No. 8--Booth# 18

Strike-slip and transform fault tectonics. Posters
Monday, 4 October 2010: 08:30-18:30
Exhibition Hall (METU Convention and Cultural Centre)
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