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Mineralogical Magazine; October 2004; v. 68; no. 5; p. 801-811; DOI: 10.1180/0026461046850220
© 2004 Mineralogical Society of Great Britain and Ireland
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Infrared and Raman spectra of ZrSiO4 experimentally shocked at high pressures

A. Gucsik1, M. Zhang2,*, C. Koeberl1, E. K. H. Salje2, S. A. T. Redfern2 and J. M. Pruneda2

1 Institute of Geological Sciences, University of Vienna, Althanstrasse 14, A-1090 Vienna, Austria
2 Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK

* E-mail: mz10001{at}esc.cam.ac.uk

Zircon- and reidite-type ZrSiO4 produced by shock recovery experiments at different pressures have been studied using infrared (IR) and Raman spectroscopy. The {nu}3 vibration of the SiO4 group in shocked natural zircon shows a spectral change similar to that seen in radiation-damaged zircon: a decrease in frequency and increase in linewidth. The observation could imply a possible similar defective crystal structure between the damaged and shocked zircon. The shock-pressure-induced structural phase transition from zircon (I41/amd) to reidite (I41/a) is proven by the occurrence of additional IR and Raman bands. Although the SiO4 groups in both zircon- and reidite-ZrSiO4 are isolated, the more condensed scheelite gives rise to Si–O stretching bands at lower frequencies, suggesting a weakening of the bond strength. Low-temperature IR data of the reidite-type ZrSiO4 show an insignificant effect of cooling on the phonon modes, suggesting that the structural response of reidite to cooling-induced compression is weak and its thermal expansion is very small.

KEYWORDS: ZrSiO4, zircon, reidite, scheelite structure, high pressure, phase transition, infrared spectroscopy, Raman spectroscopy, metamictization






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