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Mineralogy and Petrology

, Volume 99, Issue 1–2, pp 105–111 | Cite as

OH point defects in olivine from Pakistan

  • Jürgen GoseEmail author
  • Esther Schmädicke
  • Margit Markowitz
  • Anton Beran
Original Paper

Abstract

The infrared (IR) spectra of gem-quality olivine crystals from Pakistan, formed in serpentinised dunitic rocks, are characterised by strongly pleochroic absorption bands at 3,613, 3,597, 3,580 and 3,566 cm−1. These bands are assigned to O-H stretching vibrations of OH point defects corresponding to H2O concentrations of about 35 wt ppm. Unlike other olivine spectra, the dominating bands are strongly polarised parallel to the b-axis. The unusual spectra type, excludes the presence of planar defects. This finding is supported by transmission electron microscopy. The 3,613 cm−1 band is related to vacant Si sites, the slightly lower energetic bands preferentially to vacant M2 sites. The exclusive presence of these bands is not only a characteristic feature of olivines treated under high P,T conditions equivalent to mantle environment, the presence of these bands in untreated natural olivine also indicates formation conditions equivalent to crustal rocks.

Keywords

Olivine Mantle Olivine Dipole Direction Natural Olivine Forsterite Crystal 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

Thanks are due to A. Wagner for careful sample preparation and to B. Rieck for kindly providing sample material. We wish to thank G. Giester for carrying out the X-ray orientation of the samples. We are indebted to R. Wirth who kindly confirmed the absence of planar defects and other inclusions by TEM. We thank J. Mosenfelder and an anonymous reviewer for their helpful suggestions to improve our manuscript and L. Nasdala for editorial handling.

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Jürgen Gose
    • 1
    Email author
  • Esther Schmädicke
    • 1
  • Margit Markowitz
    • 2
  • Anton Beran
    • 2
  1. 1.Geozentrum NordbayernUniversität Erlangen-NürnbergErlangenGermany
  2. 2.Institut für Mineralogie und KristallographieUniversität Wien-GeozentrumWienAustria

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