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    High pressure magnetic transition in pyrrhotite and impact demagnetization on Mars

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    Name:
    Rochette_et_al-2003-Geophysica ...
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    Final Published Version
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    Author
    Rochette, P.
    Fillion, G.
    Ballou, R.
    Brunet, F.
    Ouladdiaf, B.
    Hood, L.
    Affiliation
    Univ Arizona, Lunar and Planetary Lab
    Issue Date
    2003-07
    
    Metadata
    Show full item record
    Publisher
    AMER GEOPHYSICAL UNION
    Citation
    High pressure magnetic transition in pyrrhotite and impact demagnetization on Mars 2003, 30 (13) Geophysical Research Letters
    Journal
    Geophysical Research Letters
    Rights
    Copyright 2003 by the American Geophysical Union.
    Collection Information
    This 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.
    Abstract
    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.
    Note
    6 month embargo; First published: 5 July 2003
    ISSN
    00948276
    DOI
    10.1029/2003GL017359
    Version
    Final published version
    Sponsors
    Project supported by the PNP program from CNES and CNRS.
    Additional Links
    http://doi.wiley.com/10.1029/2003GL017359
    ae974a485f413a2113503eed53cd6c53
    10.1029/2003GL017359
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