Ancient magnetic field determinations on selected chondritic meteorites

Physics

Scientific paper

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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.

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