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Title:
Estimating modal abundances from the spectra of natural and laboratory pyroxene mixtures using the modified Gaussian model
Authors:
Sunshine, J. M.; Pieters, C. M.
Affiliation:
AA(Brown Univ., Providence, RI), AB(Brown Univ., Providence, RI)
Publication:
Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. E5, p. 9075-9087. (JGR Homepage)
Publication Date:
05/1993
Category:
Lunar and Planetary Exploration; Moon
Origin:
STI
NASA/STI Keywords:
ABSORPTION SPECTRA, CONCENTRATION (COMPOSITION), MIXTURES, PYROXENES, SPECTRUM ANALYSIS, GRAIN SIZE, MATHEMATICAL MODELS, NORMAL DENSITY FUNCTIONS, SPECTRAL REFLECTANCE
Keywords:
MOON, LABORATORY STUDIES, ABUNDANCE, SPECTRA, PYROXENE, MODAL ANALYSIS, MODEL, LITHOLOGY, MIXING, PROCEDURE, GRAIN SIZE, ABSORPTION, ANALYSIS, PARTICLES, REMOTE SENSING, REFLECTANCE, EXPERIMENTS, MICROPROBE METHODS, PARAMETERS, CRYSTALS, SAMPLES, LUNAR, ORTHOPYROXENE, CLINOPYROXENE, APOLLO 12 MISSION, 12063, BASALT
DOI:
10.1029/93JE00677
Bibliographic Code:
1993JGR....98.9075S

Abstract

The modified Gaussian model (MGM) is used to explore spectra of samples containing multiple pyroxene components as a function of modal abundance. The MGM allows spectra to be analyzed directly, without the use of actual or assumed end-member spectra and therefore holds great promise for remote applications. A series of mass fraction mixtures created from several different particle size fractions are analyzed with the MGM to quantify the properties of pyroxene mixtures as a function of both modal abundance and grain size. Band centers, band widths, and relative band strengths of absorptions from individual pyroxenes in mixture spectra are found to be largely independent of particle size. Spectral properties of both zoned and exsolved pyroxene components are resolved in exsolved samples using the MGM, and modal abundances are accurately estimated to within 5-10 percent without predetermined knowledge of the end-member spectra.
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