Curie Point Depths of Albania Inferred from Ground Total Field Magnetic Data |
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Authors: | Email author" target="_blank">A?StampolidisEmail author I?Kane G?N?Tsokas P?Tsourlos |
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Institution: | (1) Applied Geophysics Laboratory, Department of Geophysics, School of Geology, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece |
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Abstract: | Ground total magnetic field data of Albania were used to produce estimates of the Curie point isotherm. The strategy followed
was to estimate the depth to the bottom of the deepest magnetic sources. Firstly, the average depth to the top of the deepest
crustal block, zt, was computed by linear fitting to the second lowest-frequency segment of the azimuthally averaged power spectrum of the
total magnetic field data. Then, the depth to the centroid of the deepest crustal block, z0, was computed by linear fitting to the lowest-frequency segment of the azimuthally averaged power spectrum of a distribution
of magnetic dipoles. Finally, the depth to the bottom, the inferred Curie point depth, zb, was calculated from zb=2z0−zt. Curie depth estimates for Albania vary from about 17 to 25.5 km (below sea level). These results are consistent with the
depths inferred by extrapolating geothermal gradient and heat-flow values, suggesting that the Curie point depth analysis
is useful to estimate the regional thermal structure. It also suggests that the approach was valid and that ground total magnetic
field data can be used for this purpose. |
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Keywords: | Albania Curie point depth ground magnetic data power spectrum |
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