Dislocations in Spinel and Garnet High-Pressure Polymorphs of Olivine and Pyroxene: Implications for Mantle Rheology
- 4 January 1980
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 207 (4426) , 66-68
- https://doi.org/10.1126/science.207.4426.66
Abstract
The meteorite Tenham was observed by transmission electron microscopy and ringwoodite and majorite, the high-pressure polymorphs of olivine and pyroxene, were identified. Ringwoodite contains antiphase boundaries and straight dislocations that are probably dissociated. Mantle flow of spinel might proceed by pure climb, and whole-mantle convection may be possible if the grain size is small enough.Keywords
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