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1 2004

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Magnetic monitoring of thermal alteration for natural pyrite and greigite

Tudryn A., Tucholka P.

Acta Geophysica Polonica

2004

Vol. 52, nr 4

509-520

Pure pyrite and greigite and pyrite/greigite mixtures were submitted to Curie balance experiments. The magnetic monitoring of the alteration of pyrite with temperature shows that at about 500°C magnetite always appears and can alter after-wards to hematite depending on the experimental conditions. Therefore, an increase of magnetisation due to the magnetite suggests the presence of pyrite in the studied samples. Samples with a pyrite/greigite mixture show minimum magnetisation during heating at 400°C, and its subsequent immediate increase. The increase of magnetisation is much higher in samples dominated by pyrite than in samples dominated by greigite. This behaviour can allow identification of pyrite in a pyrite /greigite mixture. Alteration with temperature of pyrite and greigite, which implies the appearance of magnetic minerals, can be used in magnetic and environmental studies.