Physics
Scientific paper
Nov 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983lpsc...14..221b&link_type=abstract
(American Geophysical Union and NASA, Lunar and Planetary Science Conference, 14th, Houston, TX, Mar. 14-18, 1983) Journal of Ge
Physics
3
Geochemistry, Lunar Rocks, Metallic Glasses, Regolith, Apollo 15 Flight, Ferric Ions, Lunar Composition, Lunar Geology, Metal Ions, Mossbauer Effect, Olivine, Outgassing, Silica Glass, Moon, Spectra, Chemistry, Green Glass, Glasses, Regolith, Composition, Samples, Lunar, Apollo 15, 15426, Concentration, Iron, Spectroscopy, Analogs, Formation, Hypotheses, Oxygen, Fugacity, Crystallization, Structure, Procedure, Laboratory Studies
Scientific paper
The detection of appreciable concentrations of ferric iron in a synthetic green glass equilibrated at an oxygen fugacity of 10 to the -11th atm prompted a Moessbauer spectral study of pristine emerald-green glass spherules carefully handpicked from regolith sample 15426. No Fe(3+) ions were detected in this lunar sample or in a synthetic green glass simulant equilibrated at fO2 = 10 to the -14th atm, suggesting that the green glass clods in rock 15426 formed under conditions of correspondingly low oxygen fugacities. The Moessbauer spectra indicated the presence of olivine crystallites in the lunar emerald green glass spherules. Measurements of homogeneous and partially devitrified synthetic silicate glasses revealed that significant changes of coordination environment about Fe(2+) ions in the glass structure occur during crystallization of olivine crystals from the melt.
Burns Roger G.
Darby Dyar M.
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