Anisotropy of magnetic susceptibility of rocks in the Rayleigh Law region: Modelling errors arising from linear fit to non-linear data |
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Authors: | F Hrouda |
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Institution: | (1) AGICO Inc., Ječná 29a, P.O. Box 90, CZ-621 00 Brno, Czech Republic;(2) Institute of Petrology and Structural Geology, Charles University, Albertov 6, CZ-128 43 Praha 2, Czech Republic |
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Abstract: | The anisotropy of magnetic susceptibility (AMS) within the Rayleigh Law range was investigated theoretically, using mathematical
modelling. It was revealed that the orientations of the principal susceptibilities and the shape parameter vary with field
so weakly that these variations can be regarded as negligible from the practical point of view. The degree of AMS increases
with field according to the degree of anisotropy of the initial susceptibility used and according to the intensity of susceptibility
change with field of the mineral considered. The degree of AMS calculated using linear theory is very near to the degree of
AMS following from the analysis of AMS within the Rayleigh Law range. If it is desirable to correct the field-dependent degree
of AMS, a simple technique is suggested based on measurement of the AMS in two fields.
fhrouda@agico.cz |
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Keywords: | anisotropy of magnetic susceptibility Rayleigh Law mathematical model |
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