Physics
Scientific paper
Nov 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979pepi...20..361b&link_type=abstract
(Topical Conference on Origins of Planetary Magnetism, Houston, Tex., Nov. 8-11, 1978.) Physics of the Earth and Planetary Inter
Physics
4
Chondrites, Magnetic Effects, Paleomagnetism, Remanence, Carbonaceous Meteorites, Graphs (Charts), Magnetization, Ureilites
Scientific paper
Paleofield intensity determinations involving a comparison of stable natural remanence (NRM) with a laboratory thermoremanence (TRM) were carried out on nine chondrites and on two manifestly unsuitable controls. Heat alteration was monitored by comparing saturation coercivity spectra before and after heating. The NRM and TRM intensity and stability were compared to those of residual magnetization following zero-field cooling from above the Curie point of kamacite. It was found that field strengths obtained from ordinary chondrites are typically weaker (by factors of 10-100) than those reliably determined from carbonaceous chondrites and ureilites, suggesting temporal decay of nebular magnetic fields from the end of accretion until the end of metamorphism and early catastrophic collisional stages.
Brecher Aviva
Leung Lin
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