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Incompatible magnetic behaviour of fine-grained natural haematite samples prepared in similar ways

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Summary

The results of a magnetic study of two batches of sized natural haematite fractions (from Kadaň, Czech Republic) are reported. One of the sample batches was prepared by ultrasonic micro precision sieving in propanon (acetone), the other in ethanol (alcohol). Surprisingly, the magnetic behaviour of the ethanol-sieved fractions was much softer (e.g. Hcr ≈ ≈ 20 kA/m) as compared with the propanon-sieved fractions (Hcr > 200 kA/m). Thermomagnetic measurements suggest a maghemite portion is present in the material used for the preparation of the ethanol-sieved samples. Possible causes of this puzzling behaviour are discussed. However, no definite conclusion can be drawn on the basis of the data presently available.

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Authors and Affiliations

  1. Geophysical Institute, Boční II/1401, 141 31, Praha 4, Czech Republic

    Eduard Petrovský, Vladimír Kropáček, Pavel Hejda & Tomáš Zelinka

  2. Paleomagnetic Laboratory "Fort Hoofddijk", University of Utrecht, Budapestlaan 17, 3584 CD, Utrecht, The Netherlands

    Mark J. Dekkers

Authors
  1. Eduard Petrovský
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  2. Mark J. Dekkers
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  3. Vladimír Kropáček
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  4. Pavel Hejda
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  5. Tomáš Zelinka
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Petrovský, E., Dekkers, M.J., Kropáček, V. et al. Incompatible magnetic behaviour of fine-grained natural haematite samples prepared in similar ways. Stud Geophys Geod 38, 46–56 (1994). https://doi.org/10.1007/BF02296252

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  • DOI: https://doi.org/10.1007/BF02296252

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