Abstract
RYALL and Ade-Hall have shown experimentally1 that prolonged heating of pillow basalts in suitable conditions results in the exsolution of a ‘daughter’ phase from the host titanomagnetite. They suggest that in an applied field the daughter phase acquires a chemical remanent magnetisation (CRM) when it grows to the single domain size and that on cooling, the ‘mother’ or host phase is subjected to an interaction field from the daughter phase, which, they suggest, could outweigh the effect of the external field and result in a net reversed moment of the sample. They suggest that magnetostatic or possibly exchange interaction might be responsible.
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References
Ryall, P. J. C., and Ade-Hall, J. M., Nature, 257, 117–118 (1975).
Stephenson, A., Geophys. J. R. astr. Soc., 40, 29–36 (1975).
Stephenson, A., The Moon (in the press).
Runcorn, S. K., Nature, 253, 701–703 (1975).
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STEPHENSON, A. Self reversal of thermoremanent magnetisation in basalts and global lunar magnetism. Nature 259, 101–102 (1976). https://doi.org/10.1038/259101a0
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DOI: https://doi.org/10.1038/259101a0
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