Mathematics – Logic
Scientific paper
Jul 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979natur.280..217p&link_type=abstract
Nature, vol. 280, July 19, 1979, p. 217, 218. Research supported by the Natural Environment Research Council.
Mathematics
Logic
37
Carbonaceous Meteorites, Earth Mantle, Olivine, Phase Transformations, Electron Microscopes, High Pressure, Infrared Spectra, Spinel, Thermal Stability, X Ray Diffraction, Pressure, Tenham Meteorite, Chondrites, Olivines, Mantle, Iron, Magnesium, Silicates, Kinetics, X-Ray Diffraction, Ringwoodite, Electron Microscopy, Composition, Analysis, Mineralogy, Petrography, Optical Properties, Crystals, Morphology, Spinel, Nucleation, Symmetry, Wadsleyite
Scientific paper
The mineralogical nature of the purple shocked olivine phase known as ringwoodite in the Tenham chondritic meteorite is investigated. Electron microprobe analysis indicates a composition identical to that of the relatively unshocked olivine parts of the meteorite (Mg,Fe)2SiO4. Transmission electron microscopy and X-ray diffraction reveal that the purple ringwoodite consists of a polycrystalline spinel aggregate partially inverted to the beta 'modified' spinel phase by the rapid quenching of gamma spinel. Two different mechanisms for the transformation of olivine to the original gamma spinel, namely an independent nucleation and growth mechanism and a cooperative shear mechanism, are indicated by spinel morphologies, while the inversion of the gamma to the beta spinel on quenching is shown to involve only a change in cation distribution.
Price Geoffrey D.
Putnis Andrew
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