Software for modeling the magnetic anisotropy of strained rocks

Abstract

The anisotropy of magnetic susceptibility is controlled by the preferred orientation of magnetic minerals in rocks and may be significantly influenced by deformation. This allows us to replace difficult estimation of strain parameters by indirect anisotropy of magnetic susceptibility (AMS) measurements. The interpretation of AMS is based on observation experience and modeling the AMS to strain relationship. The modeling is complex due to the large number of input parameters: different carriers of magnetism and their magnetic properties, their initial orientation distribution, the manner in which the deformation influences the reorientation of magnetic carriers, the character and duration of deformation. These parameters are taken into account in the presented package of Matlab functions for modeling AMS of strained rocks. The functions can be freely combined by the user to cover all basic types of homogeneous deformation (simple shear, pure shear, plane strain, coaxial deformation, transpression). A procedure is presented to treat the example of inhomogeneous deformation.