Physics
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993icar..104..291a&link_type=abstract
Icarus (ISSN 0019-1035), vol. 104, no. 2, p. 291-300.
Physics
33
Glass, Infrared Spectra, Iron, Lunar Soil, Regolith, Spectral Reflectance, High Temperature Gases, Hydrogen, Optical Properties, Reduction (Chemistry)
Scientific paper
A novel method of producing mixtures of glass or minerals with iron metal is presented. A portion of the Fe(2+) in basaltic glass and minerals can be reduced to metal in a few hours at 1100 C and an oxygen fugacity well below the iron-wustite buffer. Part of the iron metals forms rounded submicrometer blebs on the surfaces and in some cases within the grains. A concentration of such blebs equivalent to 20-30 percent of a grain's surface area can totally dominate the reflectance spectra of basaltic glass, pyroxene, and olivine. The production of optically opaque iron metal blebs, combined with the decline in Fe(2+), affects the glass and mineral reflectance spectra in three ways: by lowering the overall reflectivity, reducing the spectral contrast of absorption features, and producing a continuum with a general rise in reflectivity toward longer wavelengths.
Allen Christine
Lauer Howard V. Jr.
McKay David S.
Morris Richard V.
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