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High pressure magnetic transition in pyrrhotite and impact demagnetization on Mars

dc.contributor.authorRochette, P.
dc.contributor.authorFillion, G.
dc.contributor.authorBallou, R.
dc.contributor.authorBrunet, F.
dc.contributor.authorOuladdiaf, B.
dc.contributor.authorHood, L.
dc.date.accessioned2017-05-05T00:35:05Z
dc.date.available2017-05-05T00:35:05Z
dc.date.issued2003-07
dc.identifier.citationHigh pressure magnetic transition in pyrrhotite and impact demagnetization on Mars 2003, 30 (13) Geophysical Research Lettersen
dc.identifier.issn00948276
dc.identifier.doi10.1029/2003GL017359
dc.identifier.urihttp://hdl.handle.net/10150/623401
dc.description.abstractUsing 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.
dc.description.sponsorshipProject supported by the PNP program from CNES and CNRS.en
dc.language.isoenen
dc.publisherAMER GEOPHYSICAL UNIONen
dc.relation.urlhttp://doi.wiley.com/10.1029/2003GL017359en
dc.rightsCopyright 2003 by the American Geophysical Union.en
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.titleHigh pressure magnetic transition in pyrrhotite and impact demagnetization on Marsen
dc.typeArticleen
dc.contributor.departmentUniv Arizona, Lunar and Planetary Laben
dc.identifier.journalGeophysical Research Lettersen
dc.description.note6 month embargo; First published: 5 July 2003en
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en
dc.eprint.versionFinal published versionen
refterms.dateFOA2004-01-06T00:00:00Z
html.description.abstractUsing 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.


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