Mineral preferred orientation and magnetic properties as indicators of varying strain conditions in naturally deformed iron ore

Günther, A.; Brokmeier, H.-G.; Petrovsky, E.; Siemes, H.; Helming, K.; Quade, H.
June 2002
Applied Physics A: Materials Science & Processing;Dec2002 Supplement, Vol. 74 Issue 6, ps1080
Academic Journal
A folded layer of iron ore from a Brazilian mine was taken as a structural domain to investigate the degree of interdependence of mineral preferred orientation, magnetic properties and varying strain conditions. Hematite (α-Fe[sub 2]O[sub 3], rhombohedral) pole figures measured by means of neutron diffraction were recalculated by reducing the orientation distribution function (ODF) into a set of texture components. The degree of preferred orientation increases considerably from the limbs towards the core of the fold. Corresponding changes of magnetic susceptibility, its anisotropy and its hysteresis parameters (e.g. saturation magnetisation, saturation remanence, coercivity) indicate larger grains in the fold's nucleus due to varying deformational and texture modifying processes.


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