STRESS REMAGNETIZATION IN PYRRHOTITE-CALCITE SYNTHETIC AGGREGATES
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dc.contributor.author | Robion Ph. | |
dc.contributor.author | Borradaile G.J. | |
dc.date.accessioned | 2021-03-18T00:36:56Z | |
dc.date.available | 2021-03-18T00:36:56Z | |
dc.date.issued | 2001 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=1204999 | |
dc.identifier.citation | Geophysical Journal International, 2001, 144, 1, 96-104 | |
dc.identifier.issn | 0956-540X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/26860 | |
dc.description.abstract | Stress-induced remagnetization has been applied to multidomain pyrrhotite-calcite synthetic aggregates in a triaxial rig. Experimental deformation used 150 MPa confining pressure, a constant strain rate of 10-5 s-1 and applied differential stresses of up to 70 MPa. 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 15 mT. 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 (> 15 mT) 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. | |
dc.subject | PYRRHOTITE | |
dc.subject | REMAGNETIZATION | |
dc.subject | STRAIN | |
dc.subject | STRESS | |
dc.subject | TRIAXIAL DEFORMATION | |
dc.title | STRESS REMAGNETIZATION IN PYRRHOTITE-CALCITE SYNTHETIC AGGREGATES | |
dc.type | Статья |
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