Computer Science
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....1526r&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #1526
Computer Science
Scientific paper
Using neutron diffraction under pressure at room temperature, we evidenced a ferrimagnetic to paramagnetic transition of pyrrhotite in between 2.5 and 3 GPa. Complete demagnetization of saturation remanence (IRM) at about 2.8 GPa is confirmed by measuring the remaining IRM of a pyrrhotite fragment after application of a quasi-hydrostatic pressure. Such a process may provide a quantitative explanation for the large-scale distribution of crustal magnetic fields in the Martian southern hemisphere assuming that pyrrhotite is the major magnetic mineral(Rochette et al. EPSL,190, 1-12, 2001). Indeed, initial calculations suggest that the 3 GPa isobaric line during the Argyre and Hellas impacts may approximately separate the magnetized and unmagnetized zones (Hood et al. GRL, in press, 2003).
Ballou Rafik
Brunet Fabrice
Fillion Gérard
Hood Lon L.
Oulladiaf B.
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