Physics
Scientific paper
Oct 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978e%26psl..41..111o&link_type=abstract
Earth and Planetary Science Letters, vol. 41, no. 2, Oct. 1978, p. 111-127. Research supported by the Alfred P. Sloan Foundatio
Physics
12
Carbonaceous Chondrites, Chondrule, Grains, Olivine, Crystallography, Glass, Microstructure, Particle Size Distribution, Pyroxenes, Meteorites, Samples, Meteorite, Origin, Olivines, Grains, Carbonaceous Chondrites, Solar Nebula, Gases, Condensation, Chondrites, Melting, Inclusions, Pyroxene, Murchison Meteorite, Glasses, Fragments, Trace Elements, Mineralogy
Scientific paper
Two possibilities exist for the origin of aggregates and isolated grains in C2 meteorites: (1) high-temperature phases that condensed directly from a solar nebular gas accumulated as aggregates and single grains on the parent bodies of carbonaceous chondrites and remained unaltered since, or (2) all high-temperature phases in these meteorites are now, or once were, insided chondrules and have been melted out. Petrographic evidence for these two alternative models is examined critically. Four different scenarios to account for the kinds of aggregates and isolated grains in the Murchison C2 meteorite are studied. It is concluded that the majority of isolated olivine grains in the matrix never underwent melting in a chondrule-making stage. These crystal fragments and aggregates can thus be accounted for by direct condensation from a solar nebular gas.
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