Abstract
Two cases are known of rocks containing pyrrhotite, FexS, where 0.80 < x < 1.0, which are reversely magnetized in nature and where the laboratory or geological evidence suggests some form of self-reversing mechanism. These are the Jurassic tuff from Tasmania, studied by Almond et al.1 and the Carboniferous shale from Scotland, studied by Everitt2. Following this lead, the thermomagnetic properties of natural massive pyrrhotite was studied and it was found that some specimens showed partial self-reversal phenomena.
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References
Almond, M., Clegg, J. A., and Jaeger, J. C., Phil. Mag., 1, 771 (1956).
Everitt, C. W. F., Phil. Mag., 7, 831 (1962).
Néel, L., Ann. Geophys., 7, 90 (1951).
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BHIMASANKARAM, V. Partial Magnetic Self-reversal of Pyrrhotite. Nature 202, 478–480 (1964). https://doi.org/10.1038/202478a0
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DOI: https://doi.org/10.1038/202478a0
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