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Evidence of Late Cretaceous oroclinal bending in north-central Anatolia: palaeomagnetic results from Mesozoic and Cenozoic rocks along the İzmir–Ankara–Erzincan Suture Zone

By
Mualla Cengiz Cinku
Mualla Cengiz Cinku
Istanbul University, Faculty of Engineering, Department of Geophysical Engineering, 34320 Avcılar Istanbul, Turkey
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Mumtaz Hisarli
Mumtaz Hisarli
Istanbul University, Faculty of Engineering, Department of Geophysical Engineering, 34320 Avcılar Istanbul, Turkey
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Ann M. Hirt
Ann M. Hirt
Institute of Geophysics, Department of Earth Sciences, Sonneggstrasse 5, ETH Zurich, 8092 Zurich, Switzerland
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Friedrich Heller
Friedrich Heller
Institute of Geophysics, Department of Earth Sciences, Sonneggstrasse 5, ETH Zurich, 8092 Zurich, Switzerland
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Timur Ustaömer
Timur Ustaömer
Istanbul University, Faculty of Engineering, Department of Geological Engineering, 34320 Avcılar Istanbul, Turkey
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Nurcan Kaya
Nurcan Kaya
Istanbul University, Faculty of Engineering, Department of Geophysical Engineering, 34320 Avcılar Istanbul, Turkey
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Erdinç Öksüm
Erdinç Öksüm
Istanbul University, Faculty of Engineering, Department of Geophysical Engineering, 34320 Avcılar Istanbul, Turkey
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Naci Orbay
Naci Orbay
Istanbul University, Faculty of Engineering, Department of Geophysical Engineering, 34320 Avcılar Istanbul, Turkey
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Published:
January 01, 2016

Abstract

The Sakarya Zone and the Kırşehir Block of northern Turkey are separated by the İzmir–Ankara–Erzincan Suture (IAES) Zone which is the remnant of the northern branch of the Neotethys Ocean. During the closure of the IAES in the Late Cretaceous, northwards drift of the Kırşehir Block and its eventual indentation into the Sakarya Zone produced crustal deformation defined by thrusts and reverse faults, mainly between the indenting Kırşehir Block and the Sakarya Zone. Previous palaeomagnetic studies in the eastern part of the Pontides and the Sakarya Zone showed that palaeomagnetic declinations could record the deformation that resulted in the curvature of the IAES. In order to define the tectonic deformation of the northern part of the Kırşehir Block, we present new palaeomagnetic data from 57 different sites that include Mesozoic–Cenozoic sedimentary and volcanic rocks. The results from Late Cretaceous rocks (40 sites) indicate that large clockwise rotations of c. 140–165° occurred in the eastern limb of the bend, while anticlockwise rotations progressively decreased from c. 80° to 55° from SW to NW in the western limb of the bend. In contrast, small clockwise and anticlockwise rotations are observed in the flat-lying segment of the suture zone. These rotation patterns are consistent with the geometrical trends of the IAES in northern Turkey. Declinations of seven different Middle Eocene sites within the Kırşehir Block are rotated anticlockwise by c. 30–10°. This indicates that the deformation in the Sakarya Zone and the Kırşehir Block continued in the Middle Eocene.

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Geological Society, London, Special Publications

Palaeomagnetism in Fold and Thrust Belts: New Perspectives

E. L. Pueyo
E. L. Pueyo
IGME, Spain
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F. Cifelli
F. Cifelli
Università degli Studi Roma TRE, Italy
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A. J. Sussman
A. J. Sussman
Los Alamos National Laboratory, USA
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B. Oliva-Urcia
B. Oliva-Urcia
Universidad Autónoma de Madrid, Spain
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Geological Society of London
Volume
425
ISBN electronic:
9781862399570
Publication date:
January 01, 2016

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