Compositional implications regarding the lunar origin of the ALHA 81005 meteorite

Details Compositional implications regarding the lunar origin of the ALHA 81005 meteorite Compositional implications regarding the lunar origin of the ALHA 81005 meteorite

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983georl..10..833k&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 10, Sept. 1983, p. 833-836.

Physics

15

Ejecta, Lunar Rocks, Meteoritic Composition, Petrology, Breccia, Kreep, Lunar Soil, Metal Oxides, Regolith, Meteorites, Antarctic Meteorites, Allan Hills Meteorites, Alha81005, Moon, Origin, Description, Physical Properties, Characteristics, Source, Samples, Meteorite, Geochemistry, Experiments, Highlands, Regolith, Iron, Manganese, Element Ratios, Comparisons, Apollo 16, Lunar, Luna 20, 72559, Texture, Clasts, Kreep, Sodium

Scientific paper

Geochemically, ALHA 81005 has all the attributes expected of a regolith sample from the lunar highlands. Most important is its Fe/Mn ratio (77), within an uncertainty the same as the mean lunar ratio. There are significant differences, however, in comparison to previously sampled lunar regoliths. The closest precedents are the Apollo-16 and Luna-20 regoliths, particularly the latter, but ALHA 81005 has lower contents of Na, Ti, and incompatible elements. Feldspathic granulitic breccias such as 72559, which texturally resemble the most abundant type of clast in ALHA 81005, are also similar compositionally. From its low KREEP and Na contents ALHA 81005 is inferred to have originated well away from the K, Th, and U-rich region near the center of the nearside, at least as far away as the eastern limb.

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