Magnetic contaminations of small iron meteorites, Odessa and Gibeon

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Small samples of Odessa iron meteorites and Gibeon iron meteorites were studied to assess any magnetic contaminations acquired after the meteorites reached the surface of the earth. Odessa showed a stable component of natural remanent magnetization (NRM) present during AF demagnetization up to 50mT. The NRM intensity decreased from one side to the other side with the exception of an interior sample. These variations in NRM might be acquired by artificial magnetic contamination, which is supported by the REM (the ratio of NRM to saturation isothermal remanent magnetization (SIRM)) value proposed by WASILEWSKI and DICKINSON (1998). The Gibeon's subsample directions with stronger NRM intensities made one cluster and those weaker intensities clustered at a different site. According to the REM values, the more intense NRM's might be the result of a magnetic contamination overprint. From these experimental subsamples analyses, from small iron meteorites, we find that the possibility of magnetic contamination must be considered during NRM analyses of meteorite magnetism.
国立極地研究所の論文