Computer Science
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991metic..26..105d&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 26, June 1991, p. 105-109.
Computer Science
2
Allende Meteorite, Electron Microscopy, Inclusions, Pyroxenes, Refractory Materials, Crystal Dislocations, Crystal Structure, Meteoritic Composition, Solar System Evolution, Spinel
Scientific paper
A crystal of clinopyroxene from the coarse-grained refractory inclusion Egg 6 of the Allende meteorite has been studied in detail by transmission electron microscopy. The pyroxene crystal contains euhedral, dislocation-free inclusions of pure spinel MgAl2O4, without any topotactic relation to the host. Extensive dislocation walls at equilibrium, characteristic of high-temperature anneal, are present in the crystal. Alteration products are occasionaly observed at the spinel-pyroxene interface close to regions where dislocation walls decorated with bubbles (or voids) are present. The bubbles, often in the shape of tubes along the dislocation lines, are thought to be due to the precipitation of a fluid migrating along the dislocations. The observations are compatible with crystallization of the refractory inclusions from the melt and with the existence of a later stage of metasomatism.
Doukhan Jean Claude
Doukhan N.
Poirier Jean-Paul
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