Two types of chemical remanent magnetization during the oxidation of magnetite

Details Two types of chemical remanent magnetization during the oxidation of magnetite Two types of chemical remanent magnetization during the oxidation of magnetite

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pepi...46...24h&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 46, Issue 1-3, p. 24-45.

Physics

45

Scientific paper

The chemical remanent magnetization (CRM), MCRM, resulting from oxidation of equidimensional magnetite to a mixture of 90% hematite and 10% cation-deficient magnetite is jointly controlled by the initial anhysteretic remanent magnetization, (MARM), of the parent magnetite and the field HCRM applied during oxidation. MCRM lies in the plane defined by HCRM and MARM (which were perpendicular in our experiments) in an intermediate orientation determined by the relative strengths of HCRM (0.05, 0.1 and 0.2 mT) and MARM (0.002-0.12 × saturation remanence). The CRMs are univectorial remanences that remain fixed in these stable intermediate directions throughout the course of stepwise alternating field and thermal demagnetization. Similar experiments in which acicular single-domain cation-deficient magnetite was oxidized to maghemite gave quite different results. MCRM was always parallel to MARM. Its direction was unaffected by field strengths as high as HCRM = 1.5 mT. The essential factors controlling CRM direction seem to be the number and crystallographic structure of oxidation products. For single-phase oxidation without change in crystal lattice, CRM remains parallel to the initial remanence of the parent mineral. For multiphase oxidation to a mixture of rhombohedral and spinel phases, both initial remanence and the field acting during oxidation influence the CRM direction, which therefore has an intermediate orientation that parallels neither MARM nor HCRM.

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