Magnetic hysteresis properties of greigite (Fe3S4) and a new occurrence in Holocene sediments from Swedish Lappland

Details Magnetic hysteresis properties of greigite (Fe3S4) and a new occurrence in Holocene sediments from Swedish Lappland Magnetic hysteresis properties of greigite (Fe3S4) and a new occurrence in Holocene sediments from Swedish Lappland

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pepi...68...32s&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 68, Issue 1-2, p. 32-40.

Physics

47

Scientific paper

A new occurrence of ferrimagnetic greigite (Fe3S4) is reported in freshwater Holocene sediments from Gaskkamus Gorsajávri in Swedish Lappland. The presence of greigite was inferred from the mineral magnetic analysis of sediment cores. The greigite-bearing sediments possess a high saturation isothermal remanent magnetisation to susceptibility (SIRM/χ) ratio, a characteristic shared by other natural sediments known to contain greigite. The hysteresis properties (measured using a vibrating sample magnetometer) of natural greigite extracted from lake sediments show much higher saturation coercivity ((B0)C) and MRS/MS ratio values (approximately 50 mT and 0.5 respectively) than synthetic samples of greigite (approximately 12 mT and 0.2). The results suggest that synthetic greigite samples contain crystals ranging from small non-remanence carrying superparamagnetic grains to large multi-domain grains. In contrast, the natural samples probably consist predominantly of pseudo-single-domain and single-domain crystals capable of carrying a chemical remanent magnetisation. However, the unstable nature of greigite under laboratory conditions creates difficulty in characterising its physical attributes.

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