The solar nebula redox state as recorded by the most reduced chondrules of five primitive chondrites

Details The solar nebula redox state as recorded by the most reduced chondrules of five primitive chondrites The solar nebula redox state as recorded by the most reduced chondrules of five primitive chondrites

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50.1497j&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 50, July 1986, p. 1497-1502.

Computer Science

5

Chondrites, Chondrule, Meteoritic Composition, Reduction (Chemistry), Solar Corona, Stellar Composition, Electron Microscopy, Iron Oxides, Petrography, Stellar Evolution

Scientific paper

Mafic minerals in the most reduced chondrules of five primitive meteorites were analyzed with an electron microprobe to determine the lower limit on their FeO contents. The accuracy obtained was + or - 0.01 weight percent FeO. The thermodynamic relationship between mole fraction FeSiO3 and pO2 of the ambient nebular gas at the time of mineral equilibration was established, and was used to infer the local O/H ratio of the nebular gas during chondrule formation. The lowest ferrosilite compositions reflected equilibration at 1500 K with a gas 2-18 times more oxidizing than a gas of solar composition. Olivines in low-FeO unequilibrated ordinary chondrites (UOC) chondrules are uniformly more FeO-rich than coexisting pyroxenes. This discrepancy suggests that a significant change in the O/H ratio of the nebular gas occurred between the time of olivine and pyroxene crystallization in the region of the nebula where UOCs formed. Mineral compositions in the chondrules of two C2 chondrites studied suggest they formed in a more homogeneous region of the nebula than the UOCs.

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