A petromagnetic study of Miocene rocks bearing micro-organic material and the magnetic mineral greigite (Sokolov and Cheb basins, Czechoslovakia)

Details A petromagnetic study of Miocene rocks bearing micro-organic material and the magnetic mineral greigite (Sokolov and Cheb basins, Czechoslovakia) A petromagnetic study of Miocene rocks bearing micro-organic material and the magnetic mineral greigite (Sokolov and Cheb basins, Czechoslovakia)

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pepi...63...98k&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 63, Issue 1-2, p. 98-112.

Physics

25

Scientific paper

The Middle Miocene sediments of the Cypris series from the Sokolov and Cheb brown-coal basins (western Bohemia) were subjected to petromagnetic investigation. During the laboratory thermal treatment, at a temperature of 350-400°C, the samples rich in micro-organic material changed into carbonified samples which exhibited similar physical and technological properties to coal samples collected from the underlying coal seam. The experimental results may have a bearing on several problems concerning the origin of fossil fuels and highlight specific rock properties which may have potential for identifying the micro-organic content. A strongly magnetic mineral greigite Fe3S4 was identified in magnetic zones above the coal seam. The authigenic mineral greigite occurs in strata of greater thickness and it was found that a reducing environment, generated by the presence of organic matter, was required for the formation of the greigite. Metastable properties and the low coercivity spectra of this mineral are adverse for palaeomagnetic investigations.

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