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Chinese Science Bulletin

, Volume 44, Issue 12, pp 1135–1139 | Cite as

Magnetic susceptibility variation and AMS exchange related to thermal treatment of siderite

  • Yongxin Pan
  • Rixiang Zhu
  • Qingsong Liu
  • Bin Guo
Notes

Abstract

Siderite is one of the common iron-bearing carbonates in deposits. Its magnetic properties are usually neglected due to its paramagnetic property at room temperature. It was shown that the magnetic susceptibility changes with temperature variation. Also it was revealed that the maximum axis ( K1) of AMS ellipsoid exchange position gradually with the minimum axis (K 3) during thermal treatment, and thus, AMS ellipsoids of samples change from initial prolate to oblate. It was concluded that such changes resulted from the decomposition and oxidation of siderite during heating in which siderite was transformed into magnetite, maghemite, and finally to hematite.

Keywords

siderite AMS exchange thermal treatment susceptibility 

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References

  1. 1.
    Courtillot, V., Recent Progress in rock magnetism,Geophys. Res. Lett., 1996, 23: 2810CrossRefGoogle Scholar
  2. 2.
    Rochette, P., Jackson, M., Aubourg, C., Rock magnetism and the interpretation of anisotropy of magnetic susceptibility,Rev. of Geophys., 1992, 30: 209.CrossRefGoogle Scholar
  3. 3.
    Tarling, D. H., Hrouda, F.,The Magnetic Anisotropy of Rocks, London: Chapman Hall. 1993, 217.Google Scholar
  4. 4.
    Verosub, K. L., Roberts, A. P., Environmental magnetism: Past, Present, and future,J. Geophys. Res., 1995, 100: 2175.CrossRefGoogle Scholar
  5. 5.
    Kodama, K., Magnetic Fabrics,Rev. of Geophysics, 1995(Supp.): 1995, 129.CrossRefGoogle Scholar
  6. 6.
    Ellwood, B. B., Balsam, W., Burkart, B.et al., Anomalous magnetic behavior in rocks containing the mineral siderite: paleomagnetic implications,J. Geophys. Res., 1986, 91: 12779.CrossRefGoogle Scholar
  7. 7.
    Hrouda, F., A technique for the measurement of thermal changes of magnetic suceptibility of weakly magnetic rocks by the CS 2 apparatus and KLY-2 Kappabridge.Geophys. J. Int., 1994. 118: 604.CrossRefGoogle Scholar
  8. 8.
    Jacobs, L. S., Metamagnetism of siderite (FeCO3),J. of Applied Physics, 1963, 34: 1106.CrossRefGoogle Scholar
  9. 9.
    Zhu, R. X., Li, C. J., Wu, H. N.et al., Magnetic properties of the Chinese loess and their paleoclimatic significance,Sience in China, Ser. D (in Chinese), 1994, 24(9): 992.Google Scholar
  10. 10.
    Hagraves, R. B., Jhnson, D. J., Chan, C. Y., Distribution anisotropy: The cause of AMS in igneous rocks?Gophys. Res Lett., 1991, 18: 2193.CrossRefGoogle Scholar

Copyright information

© Science in China Press 1999

Authors and Affiliations

  • Yongxin Pan
    • 1
  • Rixiang Zhu
    • 1
  • Qingsong Liu
    • 1
  • Bin Guo
    • 1
  1. 1.Institute of GeophysicsChinese Academy of SciencesBeijingChina

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