Computer Science
Scientific paper
Nov 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981natur.294..142b&link_type=abstract
Nature, vol. 294, Nov. 12, 1981, p. 142-144. Research supported by the Nederlandse Organisatie voor Zuiver-Wetenschappelijk Onde
Computer Science
16
Iron, Meteoritic Composition, Meteoritic Microstructures, Olivine, Planetary Evolution, Reduction (Chemistry), Crystal Dislocations, Diffusion, Nickel, Phase Transformations, Precipitates, Protoplanets, Pyroxenes, Single Crystals, Terrestrial Planets, Distribution, Temperatures, Comparisons, Diffusion, Planetesimals, Cores, Meteorites, Evolution, Iron, Reduction, Olivine, Photomicrographs, Moon, Particles, Origin, Condensation, Crystallization, Fugacity, Formation, Electron Microscopy, Microstructure, Metal
Scientific paper
The development of the microstructure of olivine single crystals in which half of the iron has been reduced to the metallic state is examined in a study of a possible formation mechanism for the iron-nickel metallic particles found in meteorites and lunar and terrestrial rocks. Single crystals of San Carlos olivine were heated under controlled oxygen fugacity to temperatures in the range 950-1500 C to produce a matrix composition of Fo96, and the microstructures of the various stages in the reduction were observed by electron microscopy. The reduction from the Fo92 phase is found to begin with a homogeneous transformation involving fine-scale metallic precipitates resembling Guinier-Preston zones, which then grow during an Otswald ripening process. Pyroxene is first observed to nucleate heterogeneously at pre-existing dislocations and have a coarsening rate over an order of magnitude greater than that of the metallic phase. Results have implications for the distribution of siderophile elements in the accretion of terrestrial planets, planetesimals and meteorites.
Boland J. N.
Duba A.
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