Estimation of Curie-Point Depths and Heat Flow from Spectral Analysis of EMAG2 Magnetic Data in Cyprus Island

Abstract

This study aims to determine Curie point depth (CPD), Heat flow and the boundaries of geological structures of Cyprus Island using EMAG2 magnetic data. CPD values were calculated by applying spectral analysis technique to magnetic anomaly map divided into 60 blocks (60x60 km2). Then, different thermal conductivity values (K=1, 1.5 and 2.5 Wm–1 K–1) and heat flow values were calculated using CPD values. CPD values ranged from 12.4 km to 28.18 km, and heat flow values were calculated between 20 and 50 mW/m2 for K=1. Shallow CPD values (CPD< 15km) were calculated in Polis, Morphou Bay, in the area between Larnaca and Famagusta and north of Kyrenia. Heat flow values are relatively high in these areas which can be researched in detail in terms of potential geothermal. In the final phase of the study, the boundaries of buried geological structures were determined by Analytic Signal (AS), Total Horizontal Derivative (THDR) and Tilt angle (TA) methods. Moho depth, Curie-Moho difference, 2D cross-correlation map of Moho and Curie depths and Earthquake distribution map are used for interpretation of the tectonic regime. Moho-Curie difference is roughly 0 and the 2D cross-correlation map produces higher (0.60-0.75) values in the southern part of the study area which might be evaluated as a passive crust. It is possible to say that few earthquakes are observed where the difference is around 0.