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OH incorporation in synthetic diopside

¹ Geowissenschaftliches Zentrum der Universität Göttingen, Abteilung Angewandte und Experimentelle Mineralogie, Goldschmidtstraße 1, 37077 Göttingen, Germany
² Mineralogisches Institut der Universität Heidelberg, Im Neuenheimer Feld 236, 69120 Heidelberg, Germany

^* Corresponding author, e-mail: rstalde{at}gwdg.de

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.

Key-words: clinopyroxene, OH incorporation, IR-spectroscopy, SIMS, high pressure.

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