Physics
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1031p&link_type=abstract
Lunar and Planetary Science, volume 27, page 1031
Physics
6
Anorthosites, Maskelynite, Modified Gaussian Model (Mgm), Spectroscopy
Scientific paper
Reflectance spectra of several lunar and terrestrial crystalline plagioclase samples and a maskelynite separate from a lunar meteorite have been acquired. All the plagioclase samples exhibit the well-known crystal field (CF) absorption near 1.3 micrometers. Maskelynite, a diaplectic glass formed from highly shocked plagioclase, exhibits two features similar to those of homogeneous glass from octahedral and tetrahedral absorptions near 1.0 and 1.9 micrometers, respectively. MGM analyses were performed to evaluate these absorption features quantitatively. As expected, the plagioclase crystal field absorptions near 1.3 are well fit by a single absorption band with MGM. Additional features frequently appear in the visible and near infrared for plagioclase samples, but are currently unassigned. The two maskelynite features, however, are not well fit with only two bands as would be expected for glass. A third band is required with properties similar to the plagioclase band, suggesting the presence of a minor remnant plagioclase structure.
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