The effect of pressure upon hydrogen bonding in chlorite: A Raman spectroscopic study of clinochlore to 26.5 GPa

Annette K. Kleppe, Andrew P. Jephcoat, Mark D. Welch

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

The effect of pressure upon hydrogen bonding in synthetic end-member clinochlore, (Mg5Al)(Si3Al)10(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.

Original languageEnglish
Pages (from-to)567-573
Number of pages7
JournalAmerican Mineralogist
Volume88
Issue number4
Publication statusPublished - Apr 2003
Externally publishedYes

Fingerprint

clinochlore
chlorite
Hydrogen bonds
hydrogen
interlayers
discontinuity
pressure dependence
moissanite
compression
talc
Stretching
Raman spectroscopy
anvils
diffraction
Talc
narrowband
effect
Hydrogen
prediction
Diffraction

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

The effect of pressure upon hydrogen bonding in chlorite : A Raman spectroscopic study of clinochlore to 26.5 GPa. / Kleppe, Annette K.; Jephcoat, Andrew P.; Welch, Mark D.

In: American Mineralogist, Vol. 88, No. 4, 04.2003, p. 567-573.

Research output: Contribution to journalArticle

Kleppe, Annette K. ; Jephcoat, Andrew P. ; Welch, Mark D. / The effect of pressure upon hydrogen bonding in chlorite : A Raman spectroscopic study of clinochlore to 26.5 GPa. In: American Mineralogist. 2003 ; Vol. 88, No. 4. pp. 567-573.
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