The Apollo 17 drill core - Comparative modal petrology and phase chemistry of the greater than 20 micron and less than 20 micron soil fractions

Details The Apollo 17 drill core - Comparative modal petrology and phase chemistry of the greater than 20 micron and less than 20 micron soil fractions The Apollo 17 drill core - Comparative modal petrology and phase chemistry of the greater than 20 micron and less than 20 micron soil fractions

Jun 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979georl...6..503l&link_type=abstract

Geophysical Research Letters, vol. 6, June 1979, p. 503-506.

Physics

Apollo 17 Flight, Core Sampling, Geochemistry, Lunar Soil, Petrology, Feldspars, Glass, Granular Materials, Lunar Rocks, Olivine, Particle Size Distribution, Pyroxenes, Apollo 17, Deep Drill Core, Olivines, Pyroxenes, Ilmenite, Highlands, Iron, Magnesium, Grain Size, Fractionation, Plagioclase, Fragments, Samples, Lunar, Soils, Moon, Regolith, Taurus Littrow, Landing Sites, Feldspar, Glasses, Chemical Composition, Abundance, Petrology, Mineralogy

Scientific paper

Preliminary data on the modal petrology and phase chemistry of the 20-10 micron-fraction of three levels of the Apollo drill core occurring at depths of 26 cm, 147 cm, and 241 cm (Labotka et al., 1979; Vaniman et al., 1979) are compared with corresponding data for grain sizes greater than 20 microns. Results show an enrichment of the 20-10 micron fraction in plagioclase and pyroxene of highland-type composition, Al2O3-rich clear glass, and, to a lesser degree, olivine, with respect to the fraction with larger grain sizes. Relative depletions in pyroxene and ilmenite were also observed in the 20-10 micron fraction. These differences in mode and phase chemistry explain the enrichment in Al2O3 and depletion in FeO and TiO2 observed in bulk chemical analyses of the 20-10 micron soil fraction. The larger amount of highland-derived material in the finer grain sizes can be explained by the finer grain-size distributions in the more mature highland soil from local massifs, and possibly indicates a more effective transport of finer-grained particles.

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