Magnetic characterization and Mössbauer spectroscopy of magnetic concentrates from Greek lake sediments

Physics

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Scientific paper

Bulk magnetic properties of three Greek lake sediments indicated that the main magnetic constituent was predominantly pseudo-single-domain magnetite. This was confirmed by successfully extracting and directly identifying the magnetite. The majority of the magnetite in the magnetic concentrates is present as grains of about 2-3 μm in size, the overall size ranging from < 1 to ~ 10 μ m with occasional grains up to ~ 20 μ m. The grains are roughly equidimensional and angular in form indicating that they are of primarily detrital origin, although an authigenic origin for the very fine grains must be a possibility. Mössbauer spectra of the magnetic concentrates suggest that either the magnetite is slightly non-stoichiometric to a similar degree in the three lakes, or contains impurity ions. Haematite was also found in the concentrates but its abundance is only ~10-15% that of magnetite and its is not detectable in any of the magnetic properties of the sediments.

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