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Hydrogen incorporation in olivine from 2–12 GPa

Mosenfelder, Jed L. and Deligne, Natalia I. and Rossman, George R. and Asimow, Paul D. (2006) Hydrogen incorporation in olivine from 2–12 GPa. American Mineralogist, 91 (2-3). pp. 285-294. ISSN 0003-004X.

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We performed new experiments on incorporation of hydrogen in olivine at high pressures (2–12 GPa) and temperatures (1000–1300°C). OH concentrations were calculated using the Bell et al. (2003) calibration applied to principal-axis infrared absorption spectra synthesized from polarized measurements on randomly oriented grains. Starting materials for the experiments included both fi ne-grained powders and larger single crystals. Hydrogen was incorporated during grain growth in the former case and by volume diffusion in the latter. The spectra of Fe-bearing olivines exhibit similar structure regardless of the starting material, and are dominated by bands in the wavenumber range from about 3500 to 3650 cm^(–1). We do not observe bands at 3525 and 3573 cm^(–1), which are predominant in many natural olivines as well as olivines annealed in experiments at lower pressures, and are attributed to humite-related defects. Furthermore, bands between 3300 and 3400 cm^(–1), attributed to high silica activity or high oxygen fugacity, are weak or non-existent. Our measurements indicate that OH solubility in Fe-bearing olivine is 2.5–4 times higher than that measured by Kohlstedt et al. (1996). Although this is largely due to the use of a new calibration in our study, correction of previous values is not straightforward. In the pure Mg-system, in contrast to Fe-bearing olivine, order-of-magnitude apparent differences in OH solubility can be obtained using different experimental procedures. This raises questions about attainment of equilibrium in experimental studies of hydrogen incorporation in nominally anhydrous minerals, particularly when crystals are grown from a hydrous melt.

Item Type:Article
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Rossman, George R.0000-0002-4571-6884
Asimow, Paul D.0000-0001-6025-8925
Additional Information:© 2006 Mineralogical Society of America. Manuscript received March 11, 2005; manuscript accepted September 20, 2005; manuscript handled by George Lager. Financial support for this investigation was provided by NSF grants OCE-0095294 and OCE-0241716 to P.D.A. and EAR-0337816 to G.R.R. We thank Shun Karato for donation of the synthetic forsterite crystal and Mike Baker for donation of olivines and pyroxenes from Kilbourne Hole. Bruce Watson gave expert advice and encouragement on encapsulation techniques. Chi Ma and Elizabeth Miura are thanked for their assistance with electron microprobe and infrared analyses, respectively. Finally, we thank Eugen Libowitzky, Hans Keppler, and an anonymous referee for constructive reviews that improved the manuscript.
Funding AgencyGrant Number
NSFOCE- 0095294
Subject Keywords:Spectroscopy; infrared; water; mantle
Issue or Number:2-3
Record Number:CaltechAUTHORS:20120831-102043379
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:33760
Deposited By: Jason Perez
Deposited On:31 Aug 2012 18:27
Last Modified:03 Oct 2019 04:13

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