Other
Scientific paper
Aug 1957
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1957rspta.250..130c&link_type=abstract
Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, Volume 250, Issue 974,
Other
26
Scientific paper
Measurements of the directions and intensities of magnetization of Keuper Marls from Sidmouth are described. The natural remanent magnetization of these rocks is shown to be unstable in the geomagnetic field. Certain laboratory experiments are described which show the natural remanent magnetization to consist of three components, a primary component created on, or soon after, deposition, in the same direction as that of the natural remanent magnetization of Keuper Sandstones and Marls described by Clegg, Almond & Stubbs (1954); a secondary component in the direction of a geocentric axial dipole field in Britain acquired since the last reversal of the main field and a temporary component built up by the geomagnetic field between collection and measurement. The temporary and secondary components are believed to be isothermal remanent magnetizations and to be due to the red haematite cement. Application of Neel's theory of the magnetization of small single-domain particles shows that haematite grains of less than 0\cdot 15 μ in diameter will be magnetically unstable. The temporary and secondary components of magnetization are explained in terms of Neel's theory. A suggested test of stability is described.
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