The magnetic effects of brecciation and shock in meteorites. II - The ureilites and evidence for strong nebular magnetic fields. III - The achondrites

Details The magnetic effects of brecciation and shock in meteorites. II - The ureilites and evidence for strong nebular magnetic fields. III - The achondrites The magnetic effects of brecciation and shock in meteorites. II - The ureilites and evidence for strong nebular magnetic fields. III - The achondrites

May 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979m%26p....20..251b&link_type=abstract

Moon and the Planets, vol. 20, May 1979, p. 251-263, 265-279. Research sponsored by the Massachusetts Institute of Technology;

Physics

8

Achondrites, Interplanetary Magnetic Fields, Magnetic Effects, Paleomagnetism, Remanence, Shock Heating, Ureilites, Breccia, Magnetic Flux, Magnetization, Petrography, Solar System, Thermal Shock

Scientific paper

Magnetic studies were conducted on samples of the ureilitic meteorites Goalpara, Havero, Novo Urei, and Kenna. Measurements included bulk magnetic susceptibility, natural remanent magnetization (NRM), saturation remanence, and the demagnetization behavior of NRM and saturation remanence. An approximate 'fossil' magnetic field intensity was determined by analysis of coercivity spectra of NRM and saturation remanence after reheating. It was found that the magnetic susceptibility of ureilites increased with severity of shock, and the NRM intensity decreases while its coercivity spectrum generally hardens with increasing shock. Goalpara and Kenna are distinguished by unexpectedly homogeneous, strong, stable, and directionally clustered NRM, indicative of a unique original magnetizing event. The results support the assertion that both ureilites and carbonaceous chondrites have formed from related nebular material and provide further evidence for a strong external magnetic field during the accretional stages and throughout an early bombardment stage.

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