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Discussion papers
https://doi.org/10.5194/se-2019-40
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-2019-40
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 11 Mar 2019

Research article | 11 Mar 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Solid Earth (SE).

Joint analysis of the magnetic field and Total Gradient Intensity in Central Europe

Maurizio Milano1, Maurizio Fedi2, and J. Derek Fairhead3 Maurizio Milano et al.
  • 1Centro Interdipartimentale di Ricerca L.U.P.T. – Università degli Studi di Napoli Federico II
  • 2Dipartimento di Scienze della Terra, dell’Ambiente e delle Risorse – Università degli Studi di Napoli Federico II
  • 3School of Earth and Environment, University of Leeds, UK

Abstract. In the European region, the magnetic field at satellite altitudes (~ 350 km) is mainly defined by a long-wavelength magnetic-low called here the Central Europe Magnetic Low (CEML), located to the southwest of the Trans European Suture Zone (TESZ).

We studied this area by a joint analysis of the magnetic and total gradient (∇T) anomaly maps, for a range of different altitudes of 5 km, 100 km and 350 km. Tests on synthetic models showed the usefulness of the joint analysis at various altitudes to identify reverse dipolar anomalies and to characterize areas in which magnetization is weak. By this way we identified areas where either reversely or normally magnetized sources are locally dominant. At a European scale these anomalies are sparse, with a low degree of coalescence effect. The ∇T map indeed presents generally small values within the CEML area, indicating that the Palaeozoic Platform is weakly magnetized.

At 350 km altitude, the TESZ effect is largely dominant: with intense ∇T highs above the East European Craton (EEC) and very small values above the Palaeozoic Platform, this again denoting a weakly magnetized crust. Small coalescence effects are masked by the trend of the TESZ.

Although we identified sparsely located reversely magnetized sources in the Palaeozoic Platform of the CEML, the joint analysis does not support a model of a generally reversely magnetized crust. Instead, our analysis strongly favors the hypothesis that the CEML anomaly is mainly caused by a sharp contrast between the magnetic properties of EEC and Palaeozoic Platform.

Maurizio Milano et al.
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Short summary
In this work we aim at interpreting the extended magnetic low visible at satellite-altitudes above central Europe performing a joint analysis of the magnetic field and total gradient intensity maps at low and high altitudes. Here we demonstrate that such magnetic anomaly is mainly a result of the contrast between two crustal platforms differing strongly in geological and magnetic properties. Synthetic model tests have been created to support our modeling.
In this work we aim at interpreting the extended magnetic low visible at satellite-altitudes...
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