Evidence for primitive nebular components in chondrules from the Chainpur chondrite

Details Evidence for primitive nebular components in chondrules from the Chainpur chondrite Evidence for primitive nebular components in chondrules from the Chainpur chondrite

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982gecoa..46.1081g&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 46, June 1982, p. 1081-1099.

Physics

34

Chemical Composition, Chondrites, Chondrule, Meteoritic Composition, Petrography, Solar Corona, Chemical Fractionation, Factor Analysis, Iridium, Metals, Neutron Activation Analysis, Olivine, Pyroxenes, Refractory Materials, Silicates, Sulfides, Troilite, Meteorites, Chondrules, Chondrites, Chainpur Meteorite, Solar Nebula, Composition, Chemistry, Analysis, Petrography, Formation, Melting, Mixing, Metals, Sulfide, Refractory Elements, Olivine, Pyroxene, Naa, Lithophiles, Texture, Models, Experiments, Enrich

Scientific paper

In view of the fact that the least equilibrated ordinary chondrites contain chondrules that have changed little since the time of their formation in the early solar system, and are therefore excellent indicators of the physical and chemical nature of the solar nebula, 36 chondrules were separated from the Chainpur chondrite and analyzed for 20 elements and petrographic properties. The dominant nebular components found are: (1) a mixture of metal and sulfide whose composition is similar to whole rock metal and sulfide, (2) Ir-rich metal, (3) olivine-rich silicates, (4) pyroxene-rich silicates, and possibly (5) a component containing the more volatile lithophiles. Although etching experiments confirm that chondrule rims are enriched in metal, troilite and moderately volatile elements relative to the bulk chondrules, a large fraction of the volatiles remains in the unetched interior.

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