Volumes of hydration in forsterite, wadsleyite, and ringwoodite

Details Volumes of hydration in forsterite, wadsleyite, and ringwoodite Volumes of hydration in forsterite, wadsleyite, and ringwoodite

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.v53f..02s&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #V53F-02

Physics

3900 Mineral Physics, 3934 Optical, Infrared, And Raman Spectroscopy, 3954 X-Ray, Neutron, And Electron Spectroscopy And Diffraction, 8147 Planetary Interiors (5430, 5724, 6024)

Scientific paper

We have synthesized samples of Fe-free forsterite with water contents ranging from near zero to 9000 ppmw (parts per million by weight), of wadsleyite from near zero to 16000 ppmw, and ringwoodite from near zero to 12000 ppmw H2O. The samples have been analyzed by single-crystal X-ray diffraction and polarized and unpolarized FTIR spectroscopy. For forsterite, which is highly pleochroic in the infrared, we used the calibration of Bell et al (2003), whereas for wadsleyite and ringwoodite we used the calibrations of Patterson (1982) based on unpolarized spectra to determine H22O contents. For wadsleyite, we also used the crystallographic c/a ratio of Jacobsen et al. (2005). For forsterite, wadsleyite, and ringwoodite, respectively, we obtain molar volume expansions of: MV= 14.67241 (± 0.00078) + 2.07(± 0.15) x 10-6 * cH2O MV = 13.61674 (± 0.00038) + 1.43 (± 0.05) x 10-6 * cH2O MV = 13.2478 (± 0.0018) + 4.75 (± 0.35) x 10-6 * cH2O where cH2O is the concentration of water in ppmw. We thus observe similar volumetric expansion for olivine and wadsleyite, which supports the supports the revised FTIR calibration of forsterite by Bell et al (2003). The much larger expansion observed for ringwoodite may imply that the calibration of Patterson (1982) may not be applicable to this phase. An understanding of the volumetric effect of hydration may lead to a better understanding of the role and significance of water in the planet's interior.

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