Physics
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pepi...83..147b&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 83, Issue 2, p. 147-163.
Physics
13
Scientific paper
Synthetic specimens containing pseudo-single-domain magnetite were given a univectorial, anhysteretic remanent magnetisation. They were deformed in a ductile manner at room temperature under a confining pressure of 150 MPa (1.5 kbar). The strain rate was 10-5 s-1 and the maximum strain achieved was 23% shortening. A weak (0.035 mT) magnetic field was present in the pressure vessel during deformation. Hydrostatic compaction alone produced pressure demagnetisation of low-coercivity components of remanence but did not change remanence directions. Macroscopic differential stress was needed to deform the specimens, and this also permitted syndeformational remagnetisation for values of more than 20 MPa (200 bars). This added new components of piezo-remanent magnetisation (PRM) approximately parallel to the direction of the magnetic field in the pressure vessel. They were acquired in all coercivity intervals but the largest components were added below 35 mT. The final remanence orientation and its spatial distribution of vector components were dictated by the relative orientations of the remagnetising field and the initial remanence. PRM contributions almost completely masked the changes related to strain-induced grain rotation at these low strains. The directions of the externally imposed stress-strain axes may not significantly influence the direction of new remanence components. PRM acquisition occurs when differential stress exceeds a threshold value that probably depends on the previous stress-history of the magnetite grains. In part, this may explain the origin of syntectonic remagnetisation in some naturally deformed rocks where the remanence is not reset by recrystallisation, or thermal or chemical processes.
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