Intrinsic oxygen fugacity measurements of some Allende Type B inclusions

Details Intrinsic oxygen fugacity measurements of some Allende Type B inclusions Intrinsic oxygen fugacity measurements of some Allende Type B inclusions

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52.2707k&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 52, Nov. 1988, p. 2707-2716.

Computer Science

1

Allende Meteorite, Chemical Evolution, Oxygen, Solar System, Aluminum, Calcium, Inclusions, Nebulae, Oxidation

Scientific paper

The intrinsic oxygen fugacities (IOFs) of two type B Ca-rich and Al-rich inclusions (CAI) from the Allende meteorite were measured using the solid-electrolyte double-cell IOF technique of Ulmer et al. (1976). The measurements were compared to calculated and experimentally extrapolated fO2 of type B phases. It was found that the IOFs of the type B are 6-8 orders of magnitude more oxidized (H2/H2O = 1-10) than the canonical solar nebular gas (H2/H2O = 100-2000). It is suggested that some local fO2 enhancing mechanism, such as dust or gas concentrations, or the release of oxygen-rich vapors during CAI volatilization in the type B inclusions was in operation at temperatures higher than 700 C.

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