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The Depths to Lithospheric Magnetic Sources under the Baltic Shield

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Abstract

We present the results of studying the depths to lithospheric magnetic sources under the Baltic Shield and adjacent territories of the Russian Plate and the Scandinavian Caledonides. The depths have been calculated from the global model of the lithospheric geomagnetic field EMAG2v3 by the centroid method. The minimum depths of the lower boundary of the lithospheric magnetically active layer (30–35 km) were obtained under the frame of the Baltic Shield, that is, the Russian Plate, the northern and southern parts of the Scandinavian Caledonides, the maximum (>45 km), under the Scandinavian Peninsula, in the west of the Svecofennian orogen and the Norrbotten craton. The rest of the territory of the Baltic Shield is characterized by intermediate depths (38–45 km). Based on a comparison of our estimates of the depth of the lower boundary of lithospheric magnetic sources with the currently available models of the distribution of the Moho depth under the study area, it can be seen that for most of the Baltic Shield, the magnetically active layer of the lithosphere is located within the crust, with the exception of two areas under the Svecofennian orogen and the eastern part of the Kola Peninsula. This fact supports the hypothesis that the upper mantle has magnetic properties in regions where positive long-wave anomalies of the geomagnetic field are observed at satellite altitudes. The obtained results show that the western and eastern parts of the Kola Peninsula can differ not only in the velocity structure of the crust and upper mantle, which has been previously established by various seismological methods, but also in the magnetic properties of the upper mantle layer located directly under the crust.

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Funding

The study of the depths of lithospheric magnetic sources under the Kola Peninsula was supported by the Russian Science Foundation (project no. 21-17-00161), under the rest of the territory of the Baltic Shield according to the state task of IZMIRAN.

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Authors and Affiliations

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

    A. I. Filippova & S. V. Filippov

  2. Sadovskii Institute of Geosphere Dynamics, Russian Academy of Sciences, 119334, Moscow, Russia

    A. I. Filippova

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  1. A. I. Filippova
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DATA AVAILABILITY

The resulting distribution of the depth of the lower boundary of lithospheric magnetic sources is available upon request (aleirk@mail.ru).

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Filippova, A.I., Filippov, S.V. The Depths to Lithospheric Magnetic Sources under the Baltic Shield. Geomagn. Aeron. 63, 629–641 (2023). https://doi.org/10.1134/S0016793223600431

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