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Interpretation of aeromagnetic data of the Sivas Basin in the central eastern Turkey

The Sivas Basin is located in the eastern part of the central Anatolia. In this study, aeromagnetic data in the basin and surrounding area are processed and anomalies are interpreted to determine the approximate locations of the causative bodies and reveal their relationship with the tectonic trends. The sedimentary basin is surrounded by strong magnetic anomalies from the south, east, and northeast. The most apparent anomalies are observed in the E-NE of Zara, SW of Divriği, and north of Kangal. These anomalies do not present significant directional change when they are reduced to the pole process. | Turkish Journal of Earth Sciences Turkish J Earth Sci 2021 30 81-92 http journals.tubitak.gov.tr earth TÜBİTAK Research Article doi 10.3906 yer-2002-12 Interpretation of aeromagnetic data of the Sivas Basin in the central eastern Turkey 1 2 3 Funda BİLİM Attila AYDEMİR 1 Geophysical Engineering Department Engineering Faculty Sivas Cumhuriyet University Sivas Turkey 3 Turkish Petroleum Corporation Ankara Turkey 3 Energy Systems Engineering Department Engineering Faculty Atılım University Ankara Turkey Received 16.02.2020 Accepted Published Online 14.08.2020 Final Version 15.01.2021 Abstract The Sivas Basin is located in the eastern part of the central Anatolia. In this study aeromagnetic data in the basin and surrounding area are processed and anomalies are interpreted to determine the approximate locations of the causative bodies and reveal their relationship with the tectonic trends. The sedimentary basin is surrounded by strong magnetic anomalies from the south east and northeast. The most apparent anomalies are observed in the E-NE of Zara SW of Divriği and north of Kangal. These anomalies do not present significant directional change when they are reduced to the pole process. Causative bodies of the southern anomalies around Divriği and Kangal extend from NE to SW and the northerly anomaly trend to the north of Kangal crosses the southern one Divriği trend in the analytic signal map. These trends are well-defined by the maxima points of the horizontal derivatives and these maxspots generally follow the boundaries of anomalies in the tilt angle map. The Kangal Fault controls the extensions of the Divriği anomalies through the north and they are not observed in the area to the north of the fault. The Hafik Anomaly in the north of the study area is also differentiated from the anomaly group in the E-NE of Zara precisely defining that they are created by 2 different causative bodies. Aeromagnetic characteristics of the ophiolites to the south indicate that they .