Abstract
Northern Anatolia has been the subject of many studies due to its complex tectonic structure. Here we report on a paleomagnetic study sampled from upper Cretaceous to middle Miocene sedimentary and volcanic rocks at 54 sites running along the traces of the North Anatolian Fault in the Pontides, Northern Türkiye, to define the post-late Cretaceous tectonic evolution of the area. The results were evaluated together with previously published paleomagnetic data around the Kırşehir Block and the Pontides. The rotational pattern showed distinct phases in the Pontides after the late Cretaceous. A predominant late Cretaceous-middle Eocene clockwise rotation up to 38.1° ± 17.4° probably occurred due to the progressive collision between the Pontides and the Kırşehir Block from west to east. The ongoing deformation continued along the İzmir-Ankara-Erzincan Suture Belt during the middle Eocene-middle Miocene time as evidenced by the paleomagnetic rotation pattern, while no significant rotations were observed further north of the suture zone at this time period. On the other hand, middle Miocene paleomagnetic sites showed a counterclockwise rotation, reflecting the westward escape of the Anatolian microplate, while local fault-bounded vertical block rotations were apparent in places.
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The data that support the findings of this study are available on request from the corresponding author.
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Acknowledgements
We thank Savaş Karabulut and Hakan Cengiz for their help in the fieldwork and appreciate Burak Semih Çabuk for his assistance in the laboratory and fieldwork. This research was supported by the Grant Agency of Istanbul University-Cerrahpaşa (project no. 26206). The publication is in concordance with the research plan of the Institute of Geology of the Czech Academy of Sciences (No. RVO67985831). We are grateful to the editor, Nuretdin Kaymakçı, and one anonymous reviewer for their valuable suggestions that improved the manuscript.
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Appendix A.
Paleomagnetic results illustrating site numbers, age, geographic location (°N, °E), formation, rock type and bedding attitudes. N: number of samples; n: number of samples included in the site average; Dg/Ig (Ds/Is): declination/inclination before (after) tectonic correction; α95: 95% confidence limit; k: precision parameter; A95min/max: minimum/maximum cone of confidence envelopes of the VGP populations. Sites with an asterisk (*) were not considered for tectonic interpretation due to the reasons given in the text.
Appendix B.
Paleomagnetic results from previous studies. N: number of sites; D: declination; I: inclination; α95: 95% confidence limit; R: tectonic rotation; ΔR: error in rotation; *: number of samples
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Ucar, H., Cengiz, M. Post-late Cretaceous paleomagnetic rotations of the Pontides, Northern Anatolia, Türkiye. Int J Earth Sci (Geol Rundsch) (2024). https://doi.org/10.1007/s00531-024-02404-y
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DOI: https://doi.org/10.1007/s00531-024-02404-y