Abstract
The influence of heating on the low-field magnetic susceptibility K and its anisotropy, AMS, has been studied in some sedimentary, igneous and metamorphic rocks. The results show that heating causes a better grouping of the anisotropy ellipsoid axes, especially in sediments. In all the rocks studied, the AMS is mainly due to the matrix, i.e. paramagnetic and diamagnetic minerals, rather than the ferromagnetic minerals. The AMS of the diamagnetic components is removed during heating. An experiment involving thermal remagnetization of one sediment sample indicates that the processes of thermal magnetization do not influence the directions of anisotropy axes in this rock.
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