OH incorporation in synthetic diopside
2007 | journal article. A publication with affiliation to the University of Göttingen.
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- Authors
- Stalder, Roland; Ludwig, Thomas
- Abstract
- Single crystals of diopside doped with different amounts of Fe, Cr, Al and Na were synthesized under silica- and water-saturated conditions at 20 kbar. The OH-incorporation was studied by FTIR-spectroscopy and secondary ion mass spectrometry. Pure diopside exhibits one OH-absorption band at 3357 cm(-1), whereas additional absorption bands appear for Al-, Fe- and Cr-doped diopsides at 3462, 3443 and 3432 cm(-1), respectively. The observed absorption bands are interpreted to be associated with M-site vacancies, and the absence of high wavenumber absorption bands is suggested to be diagnostic for a high silica activity. Incorporation of Na in a Cr-doped diopside caused a decrease of OH-defects, consistent with a simple increase of the kosmochlor component.
- Issue Date
- 2007
- Status
- published
- Publisher
- E Schweizerbartsche Verlags
- Journal
- European Journal of Mineralogy
- ISSN
- 0935-1221