pure and applied geophysics

, Volume 114, Issue 2, pp 207–213 | Cite as

Complete and partial self-reversal of natural remanent magnetization of basaltic rocks from Lower Silesia, Poland

  • M. K⇓dziaŀko-Hofmokl
  • J. Kruczyk
Magnetic Properties

Summary

Experiments of heating-cooling cycles in zero magnetic field were performed in order to study self-reversal of NRM in basaltic rocks from Lower Silesia. Complete self-reversal occurred in one sample containing titanomagnetite withTc of 170°C and a small amount of a phase with higher Curie point. During consecutive heat treatments the phenomenon became less conspicuous. In three samples of higher oxidation level, containing several magnetic phases, only partial self-reversal of NRM occurred. For the most oxidized sample no changes of direction of NRM were observed. We suggest that the investigated phenomenon of self-reversal of NRM is due to a negative magnetic interaction between primary titanomagnetite and products of its oxidation. It seems that complete self-reversal can take place in a restricted state of oxidation.

Keywords

Oxidation Magnetic Field Heat Treatment Remanent Magnetization Magnetic Phasis 

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References

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Copyright information

© Birkhäuser Verlag 1976

Authors and Affiliations

  • M. K⇓dziaŀko-Hofmokl
    • 1
  • J. Kruczyk
    • 1
  1. 1.Institute of Geophysics of Polish Academy of SciencesWarszawa

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