Physics
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978georl...5..443h&link_type=abstract
Geophysical Research Letters, vol. 5, June 1978, p. 443-446.
Physics
18
Oxidation, Reduction, Basalts, Planets, Lunar, Venus, Earth, Mercury, Planet, Magmas, Origin Of, Fugacity, Iron, Gases, Wustite, Oxygen, Magnetite, Magnesium, Hematite, Fayalite, Quartz, Hydrogen, Crystallization, Chemical Composition
Scientific paper
Redox variations of terrestrial and lunar basalts and the redox variations in single cooling units (e.g., lava flows and lava lakes) are reviewed. Estimates for the redox states of inner solar system planetary basalts are presented; these estimates are based on consideration of a number of cosmogenic properties, models for planetary interiors, and the sequence of condensation with heliocentric distance from the protosun. It is suggested that basalts on Mercury and the Moon crystallized below the iron-wustite buffer curve; Venusian basalts are more oxidized than those on Mercury, less oxidized than those on earth, and crystallization within the field of wustite stability is thought likely; basalts on earth are dominantly in the field of magnetite stability; Martian basalts are estimated to crystallize in the upper regions of magnetite stability and well into the hematite field of stability expressed in terms of temperature and oxygen fugacity.
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