Computer Science
Scientific paper
Aug 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980gecoa..44.1161a&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 44, Aug. 1980, p. 1161-1175.
Computer Science
17
Chondrites, Chondrule, Meteoritic Composition, Radiation Effects, Cosmic Rays, Crystal Lattices, Deep Space, Evolution (Development), Iron Compounds, Nonequilibrium Conditions, Particle Tracks, Silicates, Sulfides, Meteorites, Chondrites, Chondrules, Irradiation, Composition, Data, Fission Track Analysis, Density, Cosmic Rays, Exposure Ages, Silicates, Iron Sulfide, Chainpur Meteorite, Petrography, Grains, Charcteristics, Condensation, Accretion, Origin, Samples, Meteorite, Catalogs, Alha77278, Experiments,
Scientific paper
A study of the possibility that chondrules may have had an independent existence in space was made by searching for unusual track densities in chondrules and by an investigation of the compositions of chondrule rims from thirteen unequilibrated ordinary chondrites. No unusual radiation was found; observed track densities can be explained in terms of cosmic ray exposure ages of the respective meteorites. Fine-grained rims that surround chondrules in unequilibrated ordinary chondrites are heterogeneous in composition consisting of iron sulfide and a silicate phase; fine-grained rims of the kind observed in primitive type 3 ordinary chondrites are absent in higher petrographic grades, but more crystalline, coarse-grained, and lacy sulfide rims are observed. This can be explained by chondrules having had an independent existence in space during which they acquired rims by condensation on their surfaces or by accretion of fine particles.
Allen Jeffrey S.
Nozette Stewart
Wilkening Laurel L.
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