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Hydroxide in olivine: A quantitative determination of the absolute amount and calibration of the IR spectrum

Bell, David R. and Rossman, George R. and Maldener, Joachim and Endisch, Denis and Rauch, Friedel (2003) Hydroxide in olivine: A quantitative determination of the absolute amount and calibration of the IR spectrum. Journal of Geophysical Research B, 108 (B2). Art. No. 2105. ISSN 0148-0227. doi:10.1029/2001JB000679.

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Olivine is an important host of hydrogen in the Earth's upper mantle, and the OH abundance in this mineral determines many important physical properties of the planet's interior. To date, natural and experimentally hydrated olivines have been analyzed by uncalibrated spectroscopic methods with large (±100%) uncertainties in accuracy. We determined the hydrogen contents of three natural olivines by ^(15)N nuclear reaction analysis and used the results to calibrate the common infrared (IR) spectroscopic method for quantitative hydrogen analysis of olivine. OH content (expressed as parts per million H_2O by weight) is 0.188 times the total integrated absorbance of the fundamental OH stretching bands in the 3750–3100 cm^(−1) region. The results indicate that an upward revision of some previous determinations by factors of between 2 and 4 is necessary. The most hydrous naturally occurring mantle-derived olivine analyzed to date contains 240 ppm wt. H_2O. Retrospective application of this calibration to experimentally hydrated olivines may be limited by spectral differences in some cases and by the previous use of nonpolarized IR spectra.

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Rossman, George R.0000-0002-4571-6884
Additional Information:© 2003 by the American Geophysical Union. Received 19 June 2001; revised 31 May 2002; accepted 22 October 2002; published 19 February 2003. We thank Q. Bai and D.L. Kohlstedt for the sample P9016 used in Figure 4. Olivines from Kimberley and Black Rock Summit were supplied by Mary Johnson and J.R. Furbach, respectively. This long-running study was conducted with support from the Deutsche Forschungsgemeinschaft (grant Ra303/14) to F.R. and NSF grants EAR-8816006, EAR-9104059, EAR-9804871, and EAR-0125767 to G.R.R. D.R.B. acknowledges support from DOE Office of Basic Energy Sciences grant DE-FG02-93ER14400 and the Geophysical Laboratory, Carnegie Institution of Washington. The manuscript was improved by critical comments from Jed Mosenfelder and two anonymous reviewers.
Funding AgencyGrant Number
Deutsche Forschungsgemeinschaft (DFG)Ra303/14
Department of Energy (DOE) Office of Basic Energy SciencesDE-FG02-93ER14400
Carnegie Institution of Washington Geophysical LaboratoryUNSPECIFIED
Subject Keywords:mantle; infrared; water; defect; hydrogen; spectroscopy
Issue or Number:B2
Record Number:CaltechAUTHORS:20130710-104724642
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Official Citation:Bell, D. R., G. R. Rossman, J. Maldener, D. Endisch, and F. Rauch, Hydroxide in olivine: A quantitative determination of the absolute amount and calibration of the IR spectrum, J. Geophys. Res., 108(B2), 2105, doi:10.1029/2001JB000679, 2003
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:39283
Deposited By: Tony Diaz
Deposited On:16 Jul 2013 21:39
Last Modified:09 Nov 2021 23:43

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