Investigation into regional thermal structure of the Thrace Region, NW Turkey, from aeromagnetic and borehole data |
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| Authors: | Z Mümtaz Hisarli M Nuri Dolmaz Mahmut Okyar Ali Etiz Naci Orbay |
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| Institution: | 1. Engineering Faculty, Department of Geophysical Engineering, Istanbul University, 34850, Avc?lar, Istanbul, Turkey
2. Engineering and Architecture Faculty, Department of Geophysical Engineering, Suleyman Demirel University, 32260, Isparta, Turkey
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| Abstract: | The aeromagnetic values over the study region are relatively uniform except for a few anomalies in the northeastern and southwestern
areas. Analyses of aeromagnetic data were performed in NW Turkey, in order to have a look into the subsurface regional thermal
structure of the region. For this purpose, power spectra, reduced to pole (RTP), and band-pass filtered anomalies were produced
using geophysical techniques. Band-pass filtered data were produced from the RTP aeromagnetic anomalies to isolate near surface
and undesired deep effects. Based on the aeromagnetic data interpretation, the thickness of the magnetized crust, named the
Curie Point Depth (CPD), in the study area lies between 9.7 and 20.3 km. The CPD estimates in the Thrace region of Turkey
indicate two shallow CPD (SCPD1 and SCPD2) zones (the Istranca Massif and the Saros Graben area). The deep CPD are located
within the Thrace Basin with sediment thickness of about 9 km. The corresponding heat flow map prepared from the averaged
thermal conductivities and thermal gradients from the CPD reveals the existence of one low heat flow zone (75 mW/m2) over the center of Thrace Basin, and two high heat flow zones over the Istranca Masif (100–125 mW/m2) in the northern side and Saros Graben (125–135 mW/m2) areas in the southern side of the Thrace Basin. |
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