Interpretation of the Gravity and Magnetic Anomalies of the Cappadocia Region, Central Turkey

Abstract

The Cappadocia region, located in Central Turkey, is characterized by widespread lava flows and volcanoclastic deposits dating from Miocene to Quaternary. Gravity and aeromagnetic anomalies of the region appear to present similar high and low amplitude regions, although the aeromagnetic anomalies exhibit a rather complex pattern which is thought to be caused by remanent magnetization. The low-pass filtered aeromagnetic map shows a deep-seated magnetic anomaly which may be linked to the widespread volcanic activity at the surface. The pseudogravity transformation of the upward continued anomaly has been constructed. The pseudogravity anomaly demonstrates some form of clockwise rotation. This anomaly was modelled by means of a three-dimensional method. The top and bottom of the body are at 6.3km and 11km (including the flight height) from the ground surface, respectively. This deep body is ellipsoidal and extends along an E-W direction, which is in line with the regional stress direction deduced from GPS measurements. A new mobilistic dynamo-tectonic system appears to explain the body's E-W elongation. The modelled body may be the source for the inferred geothermal energy of the region. Magnetic measurements were carried out on oriented rock samples collected from outcrops of ignimbrites and basalts, providing directions and intensities of remanent magnetization, susceptibilities and Koeningsberger (Q) ratios. Standard deviations of remanent directions of the Natural Remanent Magnetization (NRM) display a wide scatter implying unreliability of the surface data. Reduction to pole (RTP) transformation of magnetic anomalies was successful with the induced magnetization angle despite the complex pattern of magnetic anomalies.

Structural interpretation of the Tuzgolu and Haymana Basins, Central Anatolia, Turkey, using seismic, gravity and aeromagnetic data

“…Calis, Karacadag and Deliler volcanites), which resulted from the tectonic movements that occurred at different times throughout the geological history, are outcropped in limited areas and are also encountered as intercalations with sedimentary deposits. The age (Late Cretaceous, Mid-Late Eocene and Late MioceneQuaternary) of these volcanic rocks is identical to the main tectonic periods in the Central Anatolia (Dincer, 1978;Dellaloglu, 1991;Buyuksarac et al, 2005).…”

“…There are some other obvious anomalies in Fig. 5, such as the anomaly to the south of Konya studied by Ates and Kearey (2000), the other one to the east of Aksaray studied by Buyuksarac et al (2005) and the last one to the north of Kaman. However, their lo- cations are beyond the boundaries of the Tuzgolu and Haymana Basins and as such are not the subject of this study.…”

Crustal Structure of Turkey from Aeromagnetic, Gravity and Deep Seismic Reflection Data

“…Reasons and examples of complexity in the filtering process were given by Kearey (1991) and Buyuksarac et al (2005). The crustal thickness map produced from the low-pass filtered gravity anomalies of Turkey is given in Fig.…”

Determination of Tectonic and Crustal Structure of the Eastern Pontide Orogenic Belt (NE Turkey) Using Gravity and Magnetic Data

“…In the Eastern Anatolia region, BEKTAS et al (2007) showed that the Curie point depth fluctuated between 12.9 and 22.6 km. BUYUKSARAC et al (2005) identified a rotational effect in Cappadocia region, and found good correlation between magnetic anomalies and anticlockwise rotations. On the other hand, BUYUKSARAC (2007) investigated the regional wrench tectonics of inner East Anatolia (Turkey) using potential field data and exhibited similarities between tectonic lineaments of inner East Anatolia and the direction of the East Anatolian Fault Zone.…”