Mathematics – Logic
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984lpsc...15..233d&link_type=abstract
(Lunar and Planetary Institute, NASA, American Geophysical Union, et al., Lunar and Planetary Science Conference, 15th, Houston,
Mathematics
Logic
3
Glass, Lunar Rocks, Melts (Crystal Growth), Quenching (Cooling), Silicates, Spectral Signatures, Chemical Composition, Environment Simulation, Iron, Mossbauer Effect, Regolith, Moon, Experiments, Procedure, Quenching, Structure, Analogs, Silicate, Melts, Composition, Glasses, Orange Glass, Green Glass, Brown Glass, Iron, Comparisons, Cooling, Thermal Effects
Scientific paper
Compositions analogous to lunar green, orange, and brown glasses were synthesized under consistent conditions, then quenched into a variety of different media when the samples were removed from the furnace. Iron valence and coordination are a direct function of quench media used, spanning the range from brine/ice (most effective quench), water, butyl phthalate, silicone oil, liquid nitrogen, highly reducing CO-CO2 gas, to air (least efficient quench). In the green and brown glasses, Fe(3+) in four-fold and six-fold coordination is observed in the slowest-quenched samples; Fe(2+) coordination varies directly with quench efficiency. Less pronounced changes were observed in the Ti-rich orange glass. Therefore the remote-sensed spectrum of a glass-bearing regolith on the moon may be influenced by the process by which the glass cooled, and extreme caution must be used when comparing spectra of synthetic glass analogs with real lunar glasses.
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