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Incorporation of hydroxyl in upper-mantle clinopyroxenes

Smyth, J. R. and Bell, D. R. and Rossman, G. R. (1991) Incorporation of hydroxyl in upper-mantle clinopyroxenes. Nature, 351 (6329). pp. 732-735. ISSN 0028-0836. doi:10.1038/351732a0.

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Water (and hydroxyl, OH) plays an important part in determining the properties of minerals and melts in the Earth's upper mantle. The main hydroxyl-bearing phases found in rocks from the upper mantle, phlogopite and amphibole, are not believed to exist in significant quantities at depth. Some of the less abundant phases found in these rocks contain small amounts of hydrous components, but do not constitute an important reservoir for water. Traces of hydroxyl have been found in common mantle phases, but not at concentrations high enough to account for the amount of water thought to be present at depth. An exception is suggested by a report that the pyroxene (omphacite) in an eclogite nodule from the Roberts Victor kimberlite pipe contains up to 1,000 p.p.m. OH. Here we show that some of this hydroxyl is associated with cation vacancies in sodic clinopyroxene, and that these pyroxenes may be an important reservoir for hydrous components in the upper mantle.

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Rossman, G. R.0000-0002-4571-6884
Additional Information:© 1991 Nature Publishing Group. Received 10 January; accepted 13 May 1991. We thank J. J. Gurney and J. B. Hawthorne for samples and T. McCormick for helpful discussions. This study was funded in part by the NSF.
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Issue or Number:6329
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Official Citation:Smyth, J. R., D. R. Bell, et al. (1991). "Incorporation of hydroxyl in upper-mantle clinopyroxenes." Nature 351(6329): 732-735.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37906
Deposited By: Tony Diaz
Deposited On:12 Apr 2013 17:53
Last Modified:09 Nov 2021 23:32

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