Curie-point depth from spectral analysis of magnetic data in central southern Europe

Details Curie-point depth from spectral analysis of magnetic data in central southern Europe Curie-point depth from spectral analysis of magnetic data in central southern Europe

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005pepi..152..267c&link_type=abstract

Physics of the Earth and Planetary Interiors, v. 152, iss. 4 [SPECIAL ISSUE], p. 267-276.

Physics

8

Scientific paper

The basal depth of the outer layer with internal magnetic sources was calculated from magnetic data available within a roughly 500 km wide and 1200 km long area, running from central Germany to southern Italy. The dataset, deriving from different aeromagnetic surveys, is reduced to the reference altitude of 3000 m a.s.l. and a reference year of 1980.0. The adopted method, which transforms the spatial data into the frequency domain, provides a relationship between the two-dimensional spectrum of the magnetic anomalies and the top and centroid depths of the magnetic sources. The magnetic layer bottom depth (MLBD) thus obtained is 29 33 km deep in the stable areas (central Europe Variscan units, Corsica Sardinia Variscan block) and corresponds to the Moho, having an average temperature of 560 °C. From the Alps to the Apennines, MLBD ranges between 22 and 28 km and is clearly shallower than the Moho. In these units, the wide variation of MLBD appears to be compatible with the presence of shallow magnetised bodies, consisting of lower crustal rocks (Ivrea Verbano zone), ophiolitic units (Penninic zone and Voltri Massif) and intrasedimentary basic volcanic bodies (Po Basin). An average value of 25 km can be attributed to MLBD, which corresponds to a temperature of 550 °C. In the peri-Tyrrhenian zone and the Ligurian Sea, MLBD is below the Moho, which ranges from 17 to 20 km depth, and it has a temperature matching approximately to the Curie temperature of magnetite (580 °C).

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