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Physics and Chemistry of Minerals

, Volume 34, Issue 5, pp 287–294 | Cite as

Low temperature magnetism and Mössbauer spectroscopy study from natural goethite

  • T. S. Berquó
  • R. A. L. Imbernon
  • A. Blot
  • D. R. Franco
  • M. C. M. Toledo
  • C. S. M. Partiti
Original Paper

Abstract

In this work a magnetic characterization was made of natural goethite from Burkina Faso, Africa, by using low temperature magnetization curves, hysteresis loops, Mössbauer spectroscopy at room temperature and 4.2 K, and AC susceptibility from 10 to 400 K. The samples are from two distinct geological sites that underwent different weathering processes. All measurements point to the occurrence of typical high coercivity goethite. Through Mössbauer spectroscopy sample BL44, from Gangaol, northeast Burkina Faso showed relaxation effects due to a wide distribution of grain size, including superparamagnetism threshold. AC susceptibility also supports this interpretation. The sample BL50 from Bonga in Burkina Faso is associated with lateritic Ni and in addition to goethite this sample also contained magnetite, as determined by Verwey transition in low temperature measurements as well as a small content of hematite identified by Mössbauer spectroscopy.

Keywords

Goethite Gossans Magnetization AC susceptibility Mössbauer spectroscopy 

Notes

Acknowledgments

TSB thanks FAPESP (Fundação de Amaparo à Pesquisa do Estado de São Paulo) for support (grant 00/06066-3). This study was supported by National Science Foundation (NSF) grant EAR 0311869 from the Biogeosciences program. The Institute for Rock Magnetism (IRM) is funded by NSF and the W. M. Keck Foundation, the Earth Science Division of the US National Science Foundation and the University of Minnesota. This is IRM publication # 0507.

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • T. S. Berquó
    • 1
    • 2
  • R. A. L. Imbernon
    • 3
  • A. Blot
    • 4
  • D. R. Franco
    • 1
  • M. C. M. Toledo
    • 5
  • C. S. M. Partiti
    • 1
  1. 1.Laboratório de Materiais Magnéticos, Instituto de FísicaUniversidade de São PauloSão PauloBrazil
  2. 2.Institute for Rock Magnetism, Department of Geology and GeophysicsUniversity of MinnesotaMinneapolisUSA
  3. 3.Laboratório de Hidrogeoquímica, Instituto de GeociênciasUniversidade de São PauloSão PauloBrazil
  4. 4.IRD—OrstomOuagadougouBurkina Faso
  5. 5.Instituto de GeociênciasUniversidade de São PauloSão PauloBrazil

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