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.
No takes yet. Share an insight, caveat, or question.
Madon et al. (1980) studied this question.
Synapse has enriched 4 closely related papers on similar clinical questions. Consider them for comparative context: