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Magnetic properties of biogenic soil greigite (Fe 3 S 4 )
Author(s) -
Fassbinder Jörg W. E.,
Stanjek Helge
Publication year - 1994
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/94gl02506
Subject(s) - greigite , magnetite , demagnetizing field , thermomagnetic convection , geology , mineralogy , magnetization , materials science , magnetic field , metallurgy , physics , quantum mechanics
Magnetic measurements were performed on soil samples, which contained bacterial greigite. The greigite‐containing soil horizon is characterized by SIRM/χ > 70 kA m −1 and by Q‐factors >5. Alternating field (AF) demagnetization curves of the NRM gave stable directions. According to IRM acquisition and alternating field demagnetization of the IRM and ARM, the greigite in bulk soil samples shows single domain behaviour. This SD behaviour is also confirmed by hysteresis and by frequency‐dependent susceptibility measurements. The thermomagnetic behaviour was checked on extracted greigite. The magnetic parameters of soil greigite are compared with parameters of sedimentary greigite and of bacterial magnetite.