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American Mineralogist; April 2003; v. 88; no. 4; p. 567-573
© 2003 Mineralogical Society of America
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The effect of pressure upon hydrogen bonding in chlorite: A Raman spectroscopic study of clinochlore to 26.5 GPa

Annette K. Kleppe1,*, Andrew P. Jephcoat1 and Mark D. Welch2

1 Department of Earth Sciences University of Oxford, Parks Road, Oxford, OX1 3PR, U.K.
2 Department of Mineralogy, The Natural History Museum, Cromwell Road, London SW7 5BD, U.K.

Correspondence: * E-mail: Annette.Kleppe{at}earth.ox.ac.uk

The effect of pressure upon hydrogen bonding in synthetic end-member clinochlore, (Mg5Al)(Si3Al)O10(OH)8, has been studied in situ by high-pressure micro-Raman spectroscopy in a moissanite-anvil cell to 26.5 GPa at 300 K. The ambient spectrum consists of three OH-stretching bands between 3400 and 3650 cm–1, attributed to the hydrogen-bonded interlayer OH, and a narrow band at 3679 cm–1 that is assigned to the non-hydrogen-bonded OH groups of the talc-like 2:1 layer. The pressure dependence of the OH modes is linear up to 6 GPa. Near 9 GPa a major discontinuity occurs in the pressure dependence of the interlayer OH-stretching modes. It involves frequency increases >100 cm–1 that indicate major changes in hydrogen bonding. The OH mode of the 2:1 layer does not show discontinuous behavior at 9 GPa. A further discontinuity occurs at ~16 GPa. This discontinuity affects both interlayer and 2:1 OH, and is likely to be associated with a change in the overall compression mechanism of clinochlore. The spectroscopic behavior is a completely reversible function of pressure. Predictions based upon recent high-pressure diffraction studies of hydrogen bonding and compression of clinochlore suggest that the 9 GPa transition is associated with attainment of an O2– -O2– -contact distance of 2.7 Å.




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