Palaeomagnetic study of the Galatean Volcanic Province, north-central Turkey: neogene deformation at the northern border of the Anatolian Block
✍ Scribed by Hali̇l Gürsoy; John D. A. Piper; Orhan Tatar
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 714 KB
- Volume
- 34
- Category
- Article
- ISSN
- 0072-1050
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✦ Synopsis
A regional palaeomagnetic study is reported from 24 lavas of the (Late Miocene) Galatean Volcanic Province bordering the North Anatolian Fault Zone (NAFZ) in northern Anatolia. Rock magnetic studies show that the lavas have a ferromagnetic content dominated by low-Ti magnetite assemblages which have been subjected to variable degrees of high and low temperature oxidation. Although larger fractions of ferromagnetic grains are multidomain, signi®cant fractions of single domain grains are always present and presumed to be responsible for the stable remanence at all sites. Magnetic remanence is interpreted to be essentially primary because it preserves a record of both polarities which has since been tectonically rotated. Fifteen sites de®ne a coherent dipolar axis with a mean direction of D/I 16 . 8/56 . 58 (a 95 6 . 98). This is rotated clockwise by 10 . 2+7 . 28 from the Eurasian ®eld at 10 Ma and is interpreted to record block rotation during westward expulsion of lithosphere along the northern margin of the Anatolian region late in the Neotectonic history. Upper Cretaceous rocks from the northern side of this sector of the NAFZ exhibit rotations relative to Eurasia; whilst these may have been imparted partly during Eocene collision of the I . stanbul and Sakarya zones, consistent counterclockwise motions show that dierential block rotations are occurring here with the Galatean region bounded at its northern margin by the NAFZ.