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Non-Tensorial Anhysteretic Remanent Anisotropy and the Detection of Composite Fabrics.

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Title: Non-Tensorial Anhysteretic Remanent Anisotropy and the Detection of Composite Fabrics.
Authors: Finn, David1,2 (AUTHOR) dfinn@ucsc.edu, Wack, Michael R.3 (AUTHOR), Gilder, Stuart A.3 (AUTHOR), Jackson, Michael4 (AUTHOR), Coe, Robert S.2 (AUTHOR), Bilardello, Dario5 (AUTHOR), Kaub, Leon3 (AUTHOR), Williams, Wyn6 (AUTHOR), Branney, Michael J.1 (AUTHOR)
Source: Studia Geophysica & Geodaetica. Mar2026, Vol. 70 Issue 1, p1-10. 10p.
Subjects: Magnetic anisotropy, Remanence, Composite materials, Calculus of tensors, Igneous rocks
Abstract: The anisotropy of anhysteretic remanent magnetization (AARM) provides a powerful, nondestructive means of assessing magnetic fabrics. It is widely applied to infer strain and emplacement conditions in sedimentary, volcanic, and intrusive rocks. AARM is generally represented by a symmetric second-rank tensor describing its orientation, strength, and shape. AARM, however, departs from a tensorial shape when the number of grains carrying each directionally imparted anhysteretic remanence (ARM) varies with ARM orientation – a condition that arises when the alternating field (AF) over which the ARM is imparted does not fully activate the sample. Experimental data from a highly anisotropic ignimbrite sample, together with multiparticle modeling, show that such partial activation produces non-tensorial AARMs. Although this behavior complicates tensor analysis, non-tensorial AARM can reveal superimposed fabrics, provided that users can apply AF and ARM in a broad range of orientations. This article presents theoretical models that demonstrate non-tensorial behavior and explains how to utilize these properties to discern superimposed fabrics in natural samples. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:The anisotropy of anhysteretic remanent magnetization (AARM) provides a powerful, nondestructive means of assessing magnetic fabrics. It is widely applied to infer strain and emplacement conditions in sedimentary, volcanic, and intrusive rocks. AARM is generally represented by a symmetric second-rank tensor describing its orientation, strength, and shape. AARM, however, departs from a tensorial shape when the number of grains carrying each directionally imparted anhysteretic remanence (ARM) varies with ARM orientation – a condition that arises when the alternating field (AF) over which the ARM is imparted does not fully activate the sample. Experimental data from a highly anisotropic ignimbrite sample, together with multiparticle modeling, show that such partial activation produces non-tensorial AARMs. Although this behavior complicates tensor analysis, non-tensorial AARM can reveal superimposed fabrics, provided that users can apply AF and ARM in a broad range of orientations. This article presents theoretical models that demonstrate non-tensorial behavior and explains how to utilize these properties to discern superimposed fabrics in natural samples. [ABSTRACT FROM AUTHOR]
ISSN:00393169
DOI:10.1007/s11200-026-00010-z