Paleomagnetic Results from Northeast Anatolia:Remagnetization in Late Cretaceous Sandstonesand Tectonic Rotation at the Eastern Extensionof the Izmir–Ankara–Erzincan Suture Zone

Acta Geophysica

Çinku, M.C.¹ 

[1] Department of Geophysical Engineering, Faculty of Engineering,Istanbul University, Istanbul, Turkey

关键词: Northeastern Anatolia;    remagnetisation;    Late Cretaceous;    Paleomagnetic rotation;    Middle Eocene;   

学科分类：地球科学(综合)

来源: Polska Akademia Nauk * Instytut Geofizyki

【 摘 要 】

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.

【 授权许可】

Unknown