Open AccessSome Preliminary Measurements of Anisotropy of Magnetic Susceptibility of Rocks
Author(s) -
Girdler R. W.
Publication year - 1961
Publication title -
geophysical journal of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0016-8009
DOI - 10.1111/j.1365-246x.1961.tb00427.x
Subject(s) - slates , geology , anisotropy , igneous rock , remanence , rock magnetism , isotropy , magnetization , natural remanent magnetization , magnetic susceptibility , mineralogy , geophysics , geochemistry , condensed matter physics , magnetic field , physics , quantum mechanics
summary Measurements have been made on four sets of rocks, two of which showed anisotropy of magnetic susceptibility and two were isotropic. The maximum and intermediate principal susceptibilities lie in the cleavage plane for some Welsh slates and in the horizontal plane for some igneous rocks of the Skaergaard layered intrusion. In both cases the directions of natural remanent magnetization have been affected. The two sets of isotropic rocks are from the northern Pyrenees and Deccan of India respectively. Both may have been affected by stress environments, the nature of which did not cause measurable anisotropy. It is unlikely that the directions of natural remanent magnetization have been affected for these rocks.