Stress remagnetization in pyrrhotite-calcite synthetic aggregates

Details Stress remagnetization in pyrrhotite-calcite synthetic aggregates Stress remagnetization in pyrrhotite-calcite synthetic aggregates

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001geoji.144...96r&link_type=abstract

Geophysical Journal International, Volume 144, Issue 1, pp. 96-104.

Astronomy and Astrophysics

Astronomy

3

Pyrrhotite, Remagnetization, Strain, Stress, Triaxial Deformation

Scientific paper

Stress-induced remagnetization has been applied to multidomain pyrrhotite-calcite synthetic aggregates in a triaxial rig. Experimental deformation used 150MPa confining pressure, a constant strain rate of 10-5 s-1 and applied differential stresses of up to 70MPa. New components of magnetization, parallel to the direction of the pressure vessel field, were added to the pre-deformational magnetization. The intensity of remagnetization (M'-M0) increases with the intensity of the applied differential stress and affects the coercivity fraction below 15mT. Bulk shortening is less than 8 per cent, thus grain rotation cannot explain selective remagnetization of the low-coercivity fraction. Remagnetization is thus attributed to deformational viscous remanent magnetization (DVRM). It is observed that high-coercivity (>15mT) grains do not remagnetize. There is, however, slight progressive rotation of pre-deformational magnetization with increasing strain up to 8 per cent of bulk shortening. The lack of piezoremanent magnetization in the high-coercivity range may be due to defects introduced in pyrrhotite during sample preparation. Experiments using synthetic pyrrhotite, expected to show low dislocation densities, would be necessary to test this effect.

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