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Book Chapter

Anisotropy of magnetic susceptibility of rocks measured in variable weak magnetic fields using the KLY-4S Kappabridge

By
Jiří Pokorný
Jiří Pokorný
AGICO Inc., Ječná 29a, Box 90, CZ-621 00 Brno, Czech Republic e-mail: jpokorny@agico.cz
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Petr Suza
Petr Suza
AGICO Inc., Ječná 29a, Box 90, CZ-621 00 Brno, Czech Republic e-mail: jpokorny@agico.cz
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František Hrouda
František Hrouda
AGICO Inc., Ječná 29a, Box 90, CZ-621 00 Brno, Czech Republic e-mail: jpokorny@agico.czInstitute of Petrology and Structural Geology, Charles University, Albertov 6, CZ-128 43 Praha, Czech Republic
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Published:
January 01, 2004

Abstract

The theory of the anisotropy of magnetic susceptibility assumes a linear relationship between magnetization and magnetizing field, resulting in field-independent susceptibility. This relationship is valid in diamagnetic and paramagnetic minerals by definition, and also in magnetite in the fields used in common AMS meters. Pyrrhotite, hematite and titanomagnetite may show field variation of susceptibility in the same fields and therefore in principle the linear theory is incorrect for calculating the AMS. Fortunately, the linear theory nevertheless provides accurate determination of the orientations of the principal susceptibilities and of the AMS ellipsoid shape. It gives rise to inaccurate determination of the degree of AMS. Simple techniques are suggested to overcome this problem.

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Contents

Geological Society, London, Special Publications

Magnetic Fabric: Methods and Applications

F. Martín-Hernández
F. Martín-Hernández
Faculty of Geosciences, Utrecht University, The Netherlands
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C. M. Lüneburg
C. M. Lüneburg
Department of Geology and Geophysics, University of New Orleans, USA
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C. Aubourg
C. Aubourg
Laboratoire de Tectonique, Université de Cergy-Pontoise, France
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M. Jackson
M. Jackson
Institute for Rock Magnetism, University of Minnesota, USA
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Geological Society of London
Volume
238
ISBN electronic:
9781862394865
Publication date:
January 01, 2004

GeoRef

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