Physics
Scientific paper
Nov 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.2349f&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 22, p. 2349-2352
Physics
13
Bacteria, Demagnetization, Iron Compounds, Magnetic Measurement, Magnetic Properties, Sediments, Soils, Sulfur Compounds, Biogeochemistry, Ferrimagnetic Materials, Geochronology, Geomagnetism, Hysteresis
Scientific paper
Magnetic measurements were performed on soil samples, which contained bacterial greigite. The greigite-containing soil horizon is characterized by (SIRM)/chi greater than 70 kA/m and by Q-factors greater than 5. Alternating field (AF) demagnetization curves of the Natural Remanent Magnetization (NRM) gave stable directions. According to Induced Remanent Magnetization (IRM) acquisition and alternating field demagnetization of the IRM and Anistrophic Remanent Magnetism (ARM), the greigite in bulk soil samples shows single domain behavior. This SD behavior is also confirmed by hysteresis and by frequency-dependent susceptibility measurements. The thermomagnetic behavior was checked on extracted greigite. The magnetic parameters of soil greigite are compared with parameters of sedimentary greigite and of bacterial magnetite.
Fassbinder Joerg W. E.
Stanjek Helge
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