Comments on 'Anisotropic magnetic susceptibility in the continental lower crust and its implication for the shape of magnetic anomalies' by G. Florio et al.

Details Comments on 'Anisotropic magnetic susceptibility in the continental lower crust and its implication for the shape of magnetic anomalies' by G. Florio et al. Comments on 'Anisotropic magnetic susceptibility in the continental lower crust and its implication for the shape of magnetic anomalies' by G. Florio et al.

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.2773r&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 24, p. 2773-2774

Physics

3

Anisotropy, Earth Crust, Magnetic Anomalies, Magnetic Permeability, Magnetization, Alps Mountains (Europe), Italy, Lithology, Mathematical Models

Scientific paper

In their letter Lorio et al. (1993) recently explored the likelihood that the deflection with respect to present day magnetic North of dipolar lower crustal magnetic anomalies are caused by an induced magnetization deflected by strong anisotropy of magnetic susceptibility (AMS) rather than the usual explanation of an ancient natural remanent magnetization of a rotated body. Such an alternative would solve the theoretical problems raised by the stability of Natural Remanent Magnetization (NRM) at high temperature in the usually coarse grained magnetite bearing source rocks necessary to create large magnetic anomalies (Shive, 1989). They present a case study of two deep anomalies in southern Italy where the deflection is 30 to 40 deg. From a model of an anisotropic cubic source and an AMS dataset from representative deep crustal rocks from various part of the world, they conclude that no significant deflection of anomaly axis can be due to the average anisotropy ratio P(prime) = 1.5 observed in the dataset.

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