Investigating edge detection, Curie point depth, and heat flow using EMAG2 magnetic and EGM08 gravity data in the northern part of Eastern Anatolia, Turkey

The edge detection, the Curie point depths (CPDs), and the heat flow in the northern part of Eastern Anatolia were examinedusing EMAG2 magnetic and EGM08 Bouguer gravity data. Edge detection methods are extensively employed to delineate the edgesof sources using potential field data. In the study area, the tilt angle, total horizontal derivative, theta map, and 3D Euler deconvolutionmethods were used to delineate the subsurface geology and heterogeneity. The 3D Euler deconvolution method was carried out todetermine the depth of the subsurface magnetic and gravity anomalies. The Euler depth solutions show that the depths range from 0to 15 km for the Bouguer gravity anomalies, while the depths vary from 0 to 16 km for the magnetic anomalies. In this study area, theCPD values vary between 15.7 km and 18.6 km. For a thermal conductivity of 2.5 W m–1 K–1, the heat flow values were determined tobe between 75 and 95 mW m–2. A plot of CPDs versus heat flow values revealed an exponential correlation between heat flow and CPDvalues. A good relationship was detected between the CPDs and the heat flow values.

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Abraham EM, Obande EG, Chukwu M, Chukwu CG, Onwe MR (2015). Estimating depth to the bottom of magnetic sources at Wikki Warm Spring region, northeastern Nigeria, using fractal distribution of sources approach. Turkish Journal of Earth Sciences 24(5): 494-512.
Altınoğlu FF, Sarı M, Aydın A (2015). Detection of lineaments in Denizli basin of western Anatolia region using Bouguer gravity data. Pure and Applied Geophysics 1722: 415-425.
Alvandi A, Asil RH (2014). Edge detection process of Qom salt dome gravity anomalies using hyperbolic tilt angle. International Journal of Geomatics and Geosciences 52: 209-224.
Arslan M, Tüysüz N, Korkmaz S, Kurt H (1997). Geochemistry and petrogenesis of the Eastern Pontide volcanic rocks, Northeast Turkey. Chemie der Erde 57:157-187.
Ateş A, Bilim F, Büyüksaraç A (2005). Curie point depth investigation of Central Anatolia, Turkey. Pure and Applied Geophysics 162(2): 357-371.
Aydın İ, Karat Hİ, Koçak A (2005). Curie-point depth map of Turkey. Geophysical Journal International 162(2): 633-640.4.
Barka A, Gülen L (1989). Complex Evolution of the Erzincan Basin (Eastern Turkey) and its Pull-apart and Continental Escape Origin. Journal of Structural Geology 11: 275-283.
Barka A, Akyüz HS, Cohen HA, Watchorn F (2000). Tectonic evolution of the Niksar and Tasova–Erbaa pull-apart basins, North Anatolian Fault Zone: their significance for the motion of the Anatolian block. Tectonophysics 322(3-4), 243-264.
Bektaş O, Yılmaz C, Taslı K, Akdağ K, Özgür S (1995). Cretaceous rifting of the Eastern Pontides carbonate platform (NE Turkey): the formation of the carbonate breccias and turbidit. Geologia 57(1-2): 233-244.
Bektaş Ö, Ravat D, Büyüksaraç A, Bilim F, Ateş A (2007). Regional geothermal characterisation of East Anatolia from aeromagnetic, heat flow and gravity data. Pure and Applied Geophysics 164(5): 975-998.
Bilim F (2007). Investigations into the tectonic lineaments and thermal structure of Kutahya–Denizli region, western Anatolia, from using aeromagnetic, gravity and seismological data. Physics of the Earth and Planetary Interiors 165(3-4): 135-146.
Bilim F, Akay T, Aydemir A, Kosaroglu S (2016). Curie point depth, heat-flow and radiogenic heat production deduced from the spectral analysis of the aeromagnetic data for geothermal investigation on the Menderes Massif and the Aegean Region, western Turkey. Geothermics 60: 44-57.
Bilim F, Aydemir A, Ates A (2017). Tectonics and thermal structure in the Gulf of Iskenderun (southern Turkey) from the aeromagnetic, borehole and seismic data. Geothermics 70: 206-221.
Blakely RJ (1995). Potential theory in gravity and magnetic applications. Cambridge, UK: Cambridge University Press.
Chukwu CG, Udensi EE, Abraham EM, Ekwe AC, Selemo AO (2018). Geothermal energy potential from analysis of aeromagnetic data of part of the Niger-delta basin, southern Nigeria. Energy 143: 846-853.
Cordell L, Grauch VJS (1985). Mapping basement magnetization zones from aeromagnetic data in the San Juan Basin, New Mexico. In The utility of regional gravity and magnetic anomaly maps. Society of Exploration Geophysicists, pp. 181-197.
Dolmaz MN, Hisarli ZM, Ustaömer T, Orbay N (2005). Curie point depths based on spectrum analysis of aeromagnetic data, West Anatolian extensional province, Turkey. Pure and Applied Geophysics 162(3): 571-590.
Elbarbary S, Zaher MA, Mesbah H, El-Shahat A, Embaby A (2018). Curie point depth, heat flow and geothermal gradient maps of Egypt deduced from aeromagnetic data. Renewable and Sustainable Energy Reviews 91: 620-629.
Emre Ö, Duman TY, Özalp S, Elmacı H, Olgun Ş et al. (2013). Geological Map of Turkey at 1:500,000 Scale. Publications of Mineral Research and Exploration Institute (MTA) of Turkey.
Gedikoğlu A, Pelin S, Özsayar T (1979). The main lines of geotectonic development of the East Pontids in Mesozoic age. In: Proceedings of the 1st Geological Congress of the Middle East, pp. 555-580.
Gosh GK (2016). Interpretation of gravity data using 3D Euler deconvolution, tilt angle, horizontal tilt angle and source edge approximation of the North-West Himalaya. Acta Geophysica 644: 1112-1138.
Maden N (2009). Crustal thermal properties of the Central Pontides (Northern Turkey) deduced from spectral analysis of magnetic data. Turkish Journal of Earth Sciences 18(3): 383-392.
Maden N, Gelisli K, Eyuboglu Y, Bektas O (2009a). Determination of tectonic and crustal structure of the eastern Pontide orogenic belt (NE Turkey) using gravity and magnetic data. Pure and Applied Geophysics 166(12): 1987.
Maden N, Gelişli K, Eyüboğlu Y, Bektaş O (2009b). Two-and-threedimensional crustal thickness of the eastern Pontides (NE Turkey). Turkish Journal of Earth Sciences 18(2): 225-238.
Maus S, Barckhausen U, Berkenbosch H, Bournas N et al. (2009). EMAG2: A 2–arc min resolution Earth Magnetic Anomaly Grid compiled from satellite, airborne, and marine magnetic measurements. Geochemistry, Geophysics, Geosystems 10(8).
Miller HG, Singh V (1994). Potential field tilt - a new concept for location of potential field sources. Journal of Applied Geophysics 32: 213-217.
Mono JA, Ndougsa-Mbarga T, Tarek Y, Ngoh JD, Amougou OUIO (2018). Estimation of Curie-point depths, geothermal gradients and near-surface heat flow from spectral analysis of aeromagnetic data in the Loum–Minta area (Centre-East Cameroon). Egyptian journal of petroleum 27(4): 1291-1299.
MTA (2002). Geological Map of Turkey at 1:500,000 Scale. Publications of Mineral Research and Exploration Institute (MTA) of Turkey.
Nwankwo L I, Olasehinde PI, Akoshile, CO (2011). Heat flow anomalies from the spectral analysis of airborne magnetic data of Nupe Basin, Nigeria. Asian Journal of Earth Sciences 4(1): 20-28.
Okubo Y, Graf RJ, Hansen RO, Ogawa K, Tsu H (1985). Curie-point depths of the Island of Kyushu and surrounding areas, Japan. Geophysics 50(3): 481-494.
Oruç B (2011). Edge detection and depth estimation using a tilt angle map from gravity gradient data of the Kozaklı-Central Anatolia Region, Turkey. Pure and Applied Geophysics 168(10): 1769- 1780.
Oruç B, Sertçelik I, Kafadar Ö, Selim HH (2013). Structural interpretation of the Erzurum Basin, eastern Turkey, using curvature gravity gradient tensor and gravity inversion of basement relief. Journal of Applied Geophysics 88: 105-113.
Özer Ç, Polat O (2017a). İzmir ve çevresinin 3-B kabuk hız yapısı. Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi 32(3): 733-747 (in Turkish).
Ozer C, Polat O (2017b). Local earthquake tomography of Izmir geothermal area, Aegean region of Turkey. Bollettino di Geofisica Teorica ed Applicata 58(1): 17-42.
Ozer C, Gok E, Polat O (2018). Three-dimensional seismic velocity structure of the Aegean Region of Turkey from local earthquake tomography. Annals of Geophysics 61(1): 111.
Ozer C, Ozyazicioglu M, Gok E, Polat O (2019). Imaging the crustal structure throughout the East Anatolian Fault Zone, Turkey, by local earthquake tomography. Pure and Applied Geophysics 176(6): 2235-2261.
Pamuk E (2018). Edge detection in microgravity data: An example of Bornova plain and its surroundings, western Anatolia, Turkey. Dokuz Eylül Üniversitesi Mühendislik Fakültesi Fen ve Mühendislik Dergisi 20(60): 1026-1035.
Pavlis NK, Holmes SA, Kenyon SC, Factor JK (2008). An earth gravitational model to degree 2160: EGM2008. EGU General Assembly, Vienna, Austria, April 13-18.
Pavlis NK, Holmes SA, Kenyon SC, Factor JK (2012). The development and evaluation of the Earth Gravitational Model 2008 (EGM2008). Journal of Geophysical Research: Solid Earth 117(B4).
Reid AB, Allsop JM, Granser H, Millet, AJ, Somerton IW (1990). Magnetic interpretation in 3-D using Euler deconvolution. Geophysics 55: 80-91.
Spector A, Grant, FS (1970). Statistical models for interpreting aeromagnetic data. Geophysics 35(2): 293-302.
Şengör AMC, Tüysüz O, Imren C, Sakınç M, Eyidoğan H et al. (2005). The North Anatolian fault: A new look. Annual Review of Earth and Planetary Sciences 33: 37-112.
Tanaka A, Okubo Y, Matsubayashi O (1999). Curie point depth based on spectrum analysis of the magnetic anomaly data in East and Southeast Asia. Tectonophysics 306(3-4): 461-470.
Tatar O, Akpınar Z, Gürsoy H, Piper JD, Kocbulut F et al. (2013). Palaeomagnetic evidence for the neotectonic evolution of the Erzincan Basin, North Anatolian Fault Zone, Turkey. Journal of Geodynamics 65: 244-258.
Thompson DT (1982). EULDPH - a new technique for making computer-assisted depth estimates from magnetic data. Geophysics 47: 31-37.
Wijns C, Perez C, Kowalczyk P (2005). Theta map: edge detection in magnetic data. Geophysics 70(4): 39-43.
Yılmaz A, Yılmaz H (2006). Characteristic features and structural evolution of a post collisional basin: the Sivas Basin, central Anatolia, Turkey. Journal of Asian Earth Sciences 27: 164-176.