Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30m..16r&link_type=abstract
Geophysical Research Letters, Volume 30, Issue 13, pp. 16-1, CiteID 1683, DOI 10.1029/2003GL017359
Physics
30
Geomagnetism And Paleomagnetism: Rock And Mineral Magnetism, Mineral Physics: High-Pressure Behavior, Mineral Physics: X Ray, Neutron, And Electron Spectroscopy And Diffraction, Planetary Sciences: Impact Phenomena (Includes Cratering), Planetary Sciences: Magnetic Fields And Magnetism
Scientific paper
Using neutron diffraction under pressure at room temperature, we observed that pyrrhotite undergoes a ferrimagnetic to paramagnetic transition at about 2.8 GPa. Complete demagnetization of remanence at the same pressure is confirmed in an independent experiment. Such a process provides a quantitative explanation of the magnetic structure of the Martian Southern Hemisphere assuming that pyrrhotite is the major magnetic mineral and that our static experiments can be extrapolated to dynamic pressure conditions. Indeed, the 3 GPa isobaric line during the two large impacts of Argyre and Hellas separates the magnetized and unmagnetized zones. We also infer a reinterpretation of Martian meteorites paleomagnetic signal.
Ballou Rafik
Brunet Fabrice
Fillion Gérard
Hood Lon L.
Ouladdiaf Bachir
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