Investigating Moho depth, Curie Point, and heat flow variations of the Yozgat Batholith and its surrounding area, north central Anatolia,Turkey, using gravity and magnetic anomalies

Abstract

This paper proposes an interpretation of the Bouguer gravity and magnetic anomaly map of the Yozgat Batholith and its surrounding area (north central Anatolia) for determination of crustal and geothermal structures. In the study area, the Moho and Conrad depths based on a relationship between Bouguer gravity anomaly and seismically determined crustal thickness were estimated as 34-39 km and 19.5-21.5 km, respectively. The crustal thickness of the study area increases from west to east. The estimated Curie point depths in the study area by means of spectral analysis of the magnetic data vary between 10.4 and 19.5 km. The shallow depths indicate that the magnetization is restricted to the upper crust in the study area. In addition, the heat flow values calculated for a thermal conductivity of 2.7 W m -1 K -1 range from about 80 to 150 mWm -2 . The shallow velocity structures in central Anatolia are consistent with the estimated high heat flow values in the upper crust and associated with comparatively high negative Bouguer gravity anomalies.

Evaluation of sedimentary thickness and Curie point depths in the eastern part of Bornu Basin, North-Eastern Nigeria

“…Billim et al (2016) suggested that areas with CPD shallower than Moho depth are mostly located in the upper crust. Hence, the magnetic sources in the study area are located in the upper crust which agree with earlier assertions of Billim et al (2016); Billim (2017). Based on the current literatures it could be said that the variation of CPD within the Earth crust is largely depending on the geologic settings of an area.…”

“…The Curie point depth is the depths at which subsurface temperature (approximately 580 o C) loses spontaneous magnetization within the rock units and magnetic minerals show features of paramagnetic susceptibility (Khojamli et al, 2016). The depth at which the temperature reaches the Curie point is known as the Curie point depth (Billim, 2017). Curie point temperatures are not the same, the variation of the temperature depends upon the region, geology, and geochemical rock constituents (Khojamli et al, 2016).…”