Magnetic Susceptibility of Compressed Rocks

Abstract

The effect of uniaxial compression (σ) upon the initial magnetic susceptibility (κ(σ)) of rocks is empirically expressed as κ(σ)=κ0/(1+βσ) where κ0 denotes the susceptibility for σ=0. This empirical relation is interpreted as due to the effect of induced magnetoelastic energy upon rotation of magnetization of magnetic minerals whose initial anisotropy axes are randomly oriented. Feasibility of theoretical results are experimentally examined using titanomagnetite samples of different grain sizes. © 1966, Society of Geomagnetism and Earth, Planetary and Space Sciences. All rights reserved.