The lunar regolith - Chemistry and petrology of Luna 24 grain size fractions

Details The lunar regolith - Chemistry and petrology of Luna 24 grain size fractions The lunar regolith - Chemistry and petrology of Luna 24 grain size fractions

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51..661l&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 51, March 1987, p. 661-673.

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2

Chemical Fractionation, Grain Size, Lunar Composition, Lunar Soil, Petrology, Regolith, Chemical Analysis, Kreep, Lunar Probes, Microanalysis, Moon, Regolith, Samples, Lunar, Chemistry, Petrology, Luna 24, Grains, Size, Fractions, Neutron Activation Analysis, Inaa, Soils, Enrichment, Lithophiles, Micrometeorites, Agglutinates, Models, Mixing, Reworking, Formation, Laboratory Studies, Experiments, Procedure, Minor Elements, Microprobe Methods, Major Elements, 24176, 24214, Thorium, Diagrams, Aluminum Oxide,

Scientific paper

Chemical data obtained by instrumental neutron activation analysis are reported for 30 elements in eight lunar soil size fractions from 370 to less than 2 microns, as well as petrology for five size fractions down to 40-10 microns in two Luna 24 soils. While the compositions of coarser fractions are similar to each other, they differ from the fractions smaller than 10 microns; these become increasingly feldspathic and enriched in large ion lithophile elements (LILE) with decreasing grain size. The high concentrations of the Ni, Au and Ir meteoritic indicator elements in these finer fractions are consistent with comminution by meteoritic impact. Size distributions, petrology and LILE patterns indicate that Luna 24 soils are less reworked than most lunar soils.

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