Applied Magnetic Resonance

, Volume 18, Issue 4, pp 537–548 | Cite as

ESR studies of sepiolites

  • U. Ulusoy
  • M. Ikeya


The electron spin resonance (ESR) spectra for each beige and brown sepiolites from Polatli-Ankara, Turkey, a clay mineral of Mg8Si12O30(OH)4(OH2)4(H2O)8, at 77 K have their own single characteristic peak atg ≈ 1.99, which begins to anneal from 437 and 536°C, respectively. The sextet lines of Mn2+ were also observed in addition to two peaks (g = 4.4 and 5.0) associated with Fe3+. A high-quality sepiolite called “meerschaum” from Sepetci-Eskisehir, Turkey, has two characteristic peaks atg ≈ 1.99, which begins to anneal from 419°C, and atg ≈ 2.03. ESR intensities of the signal atg ≈ 1.99 for beige, brown sepiolites and meerschaum are enhanced by γ-ray irradiation to give equivalent dosesD E = 11.8 ± 3.4, 4.7 ± 2.3 and 4.6 ± 1.2 kGy, respectively. The ESR ages obtained by assessing the annual dose rate from the content of238U,232Th and40K determined by γ-ray spectroscopy are 1.8 ± 0.8, 0.7 ± 0.5 and 0.9 ± 0.2 Ma, respectively, falling into the Pliocene Epoch in geological time scale in agreement with the stratigraphy.


Electron Spin Resonance Electron Spin Resonance Spectrum Sepiolite Electron Spin Resonance Measurement Electron Spin Resonance Study 
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Copyright information

© Springer 2000

Authors and Affiliations

  • U. Ulusoy
    • 1
  • M. Ikeya
    • 2
  1. 1.Department of Physics EngineeringHacettepe UniversityAnkaraTurkey
  2. 2.Department of Earth and Space Science, Graduate School of ScienceOsaka UniversityOsakaJapan

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