Physics – Geophysics
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994e%26psl.126..129s&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 126, no. 1-3, p. 129-142
Physics
Geophysics
24
Bacteria, Fossils, Geomagnetism, Lakes, Magnetic Properties, Magnetite, Sediments, Geophysics, Grain Size, Iron Compounds, Magnetic Fields, Magnetic Measurement, Sweden
Scientific paper
A comparison of the magnetic properties of lake sediments and catchment materials from Pajep Njakajaure (north Sweden) demonstrates that high concentrations of single-domain (SD) magnetite in the upper 70 cm of gyttja in the deepest part of the basin are not of detrital origin. Transmission electron microscopy (TEM) and light microscope examination revealed the existence of bacterial cells and magnetosomes in the upper sediments which are responsible for the presence of the SD magnetite. Most of the fossil magnetosomes appear to have been dissolved through reductive processes at lower depths, although some are preserved in the lower sediments and carry a post-depositional remanent magnetization (PDRM). The results highlight the complex effects of post-depositional processes on mineral magnetic assemblages and natural remanent magnetization aquisition, and demonstrate how mineral magnetic measurements may be used to identify magnetic grain-size changes brought about by sediment diagenesis.
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