Hydroxide in olivine: A quantitative determination of the absolute amount and calibration of the IR spectrum
Abstract
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.
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.Attached Files
Published - jgrb13166.pdf
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Additional details
- Eprint ID
- 39283
- Resolver ID
- CaltechAUTHORS:20130710-104724642
- Ra303/14
- Deutsche Forschungsgemeinschaft (DFG)
- EAR-8816006
- NSF
- EAR-9104059
- NSF
- EAR-9804871
- NSF
- EAR-0125767
- NSF
- DE-FG02-93ER14400
- Department of Energy (DOE) Office of Basic Energy Sciences
- Carnegie Institution of Washington Geophysical Laboratory
- Created
-
2013-07-16Created from EPrint's datestamp field
- Updated
-
2021-11-09Created from EPrint's last_modified field
- Caltech groups
- Division of Geological and Planetary Sciences