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Planar OH-bearing defects in mantle olivine

Kitamura, Masao and Kondoh, Shinji and Morimoto, Nobuo and Miller, Gregory H. and Rossman, George R. and Putnis, Andrew (1987) Planar OH-bearing defects in mantle olivine. Nature, 328 (6126). pp. 143-145. ISSN 0028-0836. doi:10.1038/328143a0.

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Olivine, (Mg, Fe)_2SiO_4, is the predominant mineral in the upper mantle and a study of its defect structure is fundamental to an understanding of the rheological laws that describe mantle flow. Existing models are based on creep mechanisms in which point and line defects have a major role. Here we report the first observations, by transmission electron microscopy (TEM), of planar defects in olivine. The displacement vector associated with the defects, R = 1/4<011>, together with infrared absorption spectra suggest that the structure of the defects resembles that of an OH-bearing monolayer within the olivine, as exists in the humite family of minerals. Because the planar defects were formed in the upper mantle, their discovery has important implications for the deformation of olivine at high pressures and temperatures in the presence of trace quantities of water, as well as revealing another possible reservoir of water in the upper mantle.

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Rossman, George R.0000-0002-4571-6884
Additional Information:© 1987 Nature Publishing Group. Received 17, February; accepted 29 April 1987. We thank Professor A. Aoki of Tohoku University for providing the specimens of olivine.
Group:UNSPECIFIED, Division of Geological and Planetary Sciences
Issue or Number:6126
Record Number:CaltechAUTHORS:20130418-092648264
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Official Citation:Kitamura, M., S. Kondoh, et al. (1987). "Planar OH-bearing defects in mantle olivine." Nature 328(6126): 143-145.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38012
Deposited By: Ruth Sustaita
Deposited On:18 Apr 2013 23:58
Last Modified:09 Nov 2021 23:33

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