Domain observations of the magnetic phases in volcanics with self-reversed magnetization

Details Domain observations of the magnetic phases in volcanics with self-reversed magnetization Domain observations of the magnetic phases in volcanics with self-reversed magnetization

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20..675h&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 8, p. 675-678.

Physics

8

Magnetic Domains, Magnetization, Remanence, Temperature Dependence, Volcanoes, Andesite, Curie Temperature, Magnetic Fields, Magnetic Properties, Microstructure, Phase Transformations

Scientific paper

The temperature dependence of magnetic domain pattern in titanomagnetite (TM) and titanohematite (TH) of self-reversing andesites from the 1985 eruption of the Nevado del Ruiz volcano has been observed using the Bitter technique. During heating/cooling cycles, the natural remanent magnetization loses the self-reversal properties between 110 and 180 C. The TH domains disappear in the same temperature interval. Large grain regions without colloid contrast are observed between 20 and 180 C. Using a magnetic force microscope, these regions are found to contain either domains with wall spacing of about 3 microns or a buckling pattern. Along the phase boundary between a TM and a TH grain, but within the TH, a 2-micron-wide chemically different domain has been observed to have a higher Fe content than the main TH. The two TH phases represent two phases with higher Curie temperature (Tc), but lower spontaneous magnetization (Ms), and lower Tc but higher Ms, respectively. Negative interaction between these phases is called upon to explain the self-reversing mechanism.

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