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The Depths to the Lithospheric Magnetic Sources Along the Kovdor–GSZ-76 Profile (Baltic Shield–Barents Sea)

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In the paper, we present the results of a study of the depths to lithospheric magnetic sources along the Kovdor–GSZ-76 composite profile starting on the Baltic Shield and ending in the northeast of the Barents Sea. The centroid depth and the depths to the top and bottom boundaries of the magnetically active layer are calculated from the azimuthally-averaged Fourier power spectra of the lithospheric geomagnetic field using the centroid method. The lithospheric geomagnetic field is set by the most up-to-date EMAG2v3 global model. As a result, the depth to the top boundary of the magnetically active layer was found to vary from 1.1 km under the Baltic Shield to 8.1 km under the North Barents Basin, which is consistent with the variations in the thickness of the sedimentary layer along the considered profile that are obtained from seismic data. The depth to the bottom boundary of lithospheric magnetic sources is at its minimum under the Timan-Varanger fold belt (35.5 km). Under the Baltic Shield and the hypothetical Svalbard massif (within the East Barents megathrough), it increases to 39.6–41.0 km. For the studied profile, the magnetically active layer of the lithosphere is completely located within the Earth’s crust under the Baltic Shield and the Timan-Varanger fold belt. The upper mantle is probably magnetic under the northeast end of the considered profile. The depth distribution of the bottom boundary of lithospheric magnetic sources obtained in the study agrees better with independent geophysical data (the values of the surface heat flow, temperature distributions in the mantle, and thermal thickness of the lithosphere) than that of similar global and regional models calculated with allowance for the fractal nature of the magnetization distribution in the magnetoactive layer of the lithosphere.

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The work was supported by the state task of the Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, Russian Academy of Sciences.

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  1. Pushkov Institute of Terrestrial Magnetism, Ionosphere, and Radio Wave Propagation, Russian Academy of Sciences (IZMIRAN), 108840, Moscow, Troitsk, Russia

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Filippova, A.I., Filippov, S.V. The Depths to the Lithospheric Magnetic Sources Along the Kovdor–GSZ-76 Profile (Baltic Shield–Barents Sea). Geomagn. Aeron. 62, 767–778 (2022). https://doi.org/10.1134/S0016793222060044

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