The relationship between the Lisle orientation tensor and the susceptibility tensor

Lisle (1989) introduced an orientation tensor of orthogonal orientation dat a as summed cross products of the direction cosines of the X axes minus the summed cross products of the direction cosines of the Zaxes. The contribut ion deals with the relationship between the Lisle orientation tensor and th e tensor of magnetic susceptibility. The bulk magnetic susceptibility is ge nerated by a system of triaxial magnetic grains. In the case of "ideally" t riaxial magnetic grains, the eigenvectors of the tensor of Lisle are parall el to the eigenvectors of magnetic susceptibility, and in the case of gener al triaxial grains they are close to them. Analytical results and numerical modelling confirm the intuitive feeling that AMS of a system composed of t riaxial magnetic grains reflects the mean orientation of X as well as Z gra in axes. (C) 2000 Elsevier Science Ltd. All rights reserved.