Magnetic properties of natural pyrrhotite Part I: Behaviour of initial susceptibility and saturation-magnetization-related rock-magnetic parameters in a grain-size dependent framework

Details Magnetic properties of natural pyrrhotite Part I: Behaviour of initial susceptibility and saturation-magnetization-related rock-magnetic parameters in a grain-size dependent framework Magnetic properties of natural pyrrhotite Part I: Behaviour of initial susceptibility and saturation-magnetization-related rock-magnetic parameters in a grain-size dependent framework

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988pepi...52..376d&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 52, Issue 3-4, p. 376-393.

Physics

67

Scientific paper

The grain-size dependence of the initial susceptibility (Xin), saturation magnetization (Js), saturation remanence (Jrs), coercive force (Hc), remanent coercive force (Hcr) and remanent acquisition coercive force (Hcr'), is reported for four natural pyrrhotites in a grain-size range from 250 μm down to < 5 μm. Xin decreases with decreasing grain size (range 7 × 10-5-1 × 10-5 m3 kg-1) Hc, Hcr and Hcr' all increase with decreasing grain size (ranges respectively 7-80, 8-85 and 14-80 kA m-1). The magnitudes of Js (8.9-16.7 A m2 kg-1) and Jrs (2.0-6.0 A m2 kg-1) correspond with the trend indicated by the microprobe analysis (47.8 down to 46.9 at.% equivalent Fe). Jrs shows a maximum in the pseudo-single domain region (range 2.0-6.0 A m2 kg-1). Js shows a marked decrease for the finest grain-size fractions. Typical for pyrrhotite are a large Hc/Hcr ratio and a Jrs/Xin ratio which is larger than Hcr. When the presence of pyrrhotite has been established in a sample, its grain size is preferable determined by the Hcr trend because pyrrhotite compositional differences hardly show up in this trend.

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