Demagnetization of terrestrial and extraterrestrial rocks under hydrostatic pressure up to 1.2 GPa

Details Demagnetization of terrestrial and extraterrestrial rocks under hydrostatic pressure up to 1.2 GPa Demagnetization of terrestrial and extraterrestrial rocks under hydrostatic pressure up to 1.2 GPa

Mar 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010pepi..179....7b&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 179, Issue 1-2, p. 7-20.

Physics

7

Scientific paper

We carried out hydrostatic pressure demagnetization experiments up to 1.24 GPa on samples of terrestrial and extraterrestrial rocks and minerals of different lithologies as well as on synthetic samples. The magnetic remanence of samples was measured directly under pressure using a non-magnetic high-pressure cell of piston-cylinder type that was inserted into a high sensitivity SQUID magnetometer. In order to bring light on the pressure demagnetization effect, we investigated 50 samples with different magnetic mineralogies, remanent coercivities (Bcr) and hysteresis parameters. The samples consisted of pyrrhotite-, magnetite- and titanomagnetite-bearing Martian meteorites, taenite-, tetrataenite- and kamacite-bearing ordinary chondrites and pyrrhotite-bearing Rumuruti chondrite; magnetite- and titanomagnetite-bearing basalts, andesites, ignimbrites, obsidians and granites; a variety of pyrrhotite- and hematite-bearing rocks and minerals (jasper, schist, rhyolite, radiolarite); samples of goethite and greigite as well as synthetic samples of dispersed powders of magnetite, hematite, pyrrhotite and native iron set into epoxy resin. Under hydrostatic pressure of 1.24 GPa, applied in a low magnetic field (<5 μT), the samples lost up to 84% of their initial saturation isothermal remanent magnetization (SIRM) without any changes in their intrinsic magnetic properties. We found that the efficiency of the pressure demagnetization is not exclusively controlled by the magnetic hardness of the samples (Bcr), but that it is strongly dependent on their magnetic mineralogy. For a given magnetic mineralogy the resistance to hydrostatic pressure is roughly proportional to ln(Bcr). It was shown that there is no simple equivalence between pressure demagnetization and alternating field demagnetization effects. The pressure demagnetization was shown to be time-independent but repeated application of the same pressure level resulted in further demagnetization.

Affiliated with

Also associated with

No associations

Rating

Demagnetization of terrestrial and extraterrestrial rocks under hydrostatic pressure up to 1.2 GPa does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Demagnetization of terrestrial and extraterrestrial rocks under hydrostatic pressure up to 1.2 GPa, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Demagnetization of terrestrial and extraterrestrial rocks under hydrostatic pressure up to 1.2 GPa will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1224736