A possible assessment of an origin of remanent magnetism of the Fermo H-chondrite breccia: a study of diffusion of heat from the surface of the meteorite into its interior

Details A possible assessment of an origin of remanent magnetism of the Fermo H-chondrite breccia: a study of diffusion of heat from the surface of the meteorite into its interior A possible assessment of an origin of remanent magnetism of the Fermo H-chondrite breccia: a study of diffusion of heat from the surface of the meteorite into its interior

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003coska..33..193h&link_type=abstract

Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 33, no. 3, p. 193-208.

Astronomy and Astrophysics

Astronomy

1

Meteorite, H3-5 Fermo Chondrite, Taenite, Thermoremanent Magnetization, Mathematical Model

Scientific paper

Fermo meteorite, who fell on September 25, 1996 (Molin et al. 1997) is analysed from the viewpoint of its remanent magnetization (RM) and a simplified model describing heating of a meteoroid is discussed. The main carrier of RM of the H3-5 Fermo chondrite, according to Curie temperature and the results of thermal demagnetization of samples, is probably the taenite (γ phase). The results have approved that the intensity and the directional stability (declination and inclination) of RM of Fermo disappeared completely at 500-600°C. A solution of mathematical model for penetration of temperature inside a spherical meteoroid heated from its surface has shown that there exists some time interval in which the sphere in almost of half of its radius was heated to the temperature above or close to the Curie temperature of taenite (TC ≈ 560-600°C). This means that when the meteoroid becomes so hot (500-600°C) any eventual extraterrestrial magnetization cannot survive and completely disappears. A new RM probably of thermoremanent (TRM) origin was induced by the geomagnetic field after fall of the meteorite on the Earth's surface.

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