Paleomagnetic results from Northeast Anatolia: remagnetization in Late Cretaceous sandstones and tectonic rotation at the Eastern extension of the Izmir–Ankara–Erzincan suture zone

Paleomagnetic results obtained from Upper Cretaceous sandstones in Northeastern Anatolia demonstrate that the entire area from Erzincan to Kars has been remagnetised. The remagnetisation was acquired before the Middle Eocene collision between the Eastern Pontides and the Arabian Platform because Mid...

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Bibliographic Details
Published in:Acta geophysica 2017-12, Vol.65 (6), p.1095-1109
Main Author: Cengiz Çinku, Mualla
Format: Article
Language:English
Subjects:
Cretaceous
Earth and Environmental Science
Earth Sciences
Eocene
Geophysics/Geodesy
Geotechnical Engineering & Applied Earth Sciences
Miocene
Paleomagnetism
Remagnetization dating
Research Article - Solid Earth Sciences
Rotation
Sandstone
Structural Geology
Tectonics
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Summary:Paleomagnetic results obtained from Upper Cretaceous sandstones in Northeastern Anatolia demonstrate that the entire area from Erzincan to Kars has been remagnetised. The remagnetisation was acquired before the Middle Eocene collision between the Eastern Pontides and the Arabian Platform because Middle Eocene sandstones carry primary natural remanent magnetisations. The post-folding in situ mean direction of the Upper Cretaceous sandstones is compared with mean directions of younger, Middle Eocene to present rock formations. As a result, a two-stage antagonistic rotation mechanism is proposed. First, the collision between the Pontides and the Taurides between Late Cretaceous and Middle Eocene was associated by clockwise rotation of  ~ 26°. In the second stage between Middle Eocene and Middle Miocene and beyond, counterclockwise rotations up to ~ 52° of the Pontide and Anatolide blocks and clockwise rotations of the Van Block were characterised by regional shortening and westward escape.
ISSN:1895-6572
1895-7455
DOI:10.1007/s11600-017-0097-7