Meteorite ALHA 81005 - Petrology of a new lunar highland sample

Physics

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Lunar Rocks, Meteoritic Composition, Petrology, Basalt, Breccia, Chondrule, Glass, Lithology, Meteorites, Antarctic Meteorites, Allan Hills Meteorites, Alha81005, Moon, Origin, Description, Physical Properties, Characteristics, Data, Source, Petrology, Samples, Meteorite, Highlands, Regolith, Breccias, Shock, Glass, Mineralogy, Lithology, Composition, Alkalis

Scientific paper

The meteorite is classed as a shock-compacted lunar highland regolith breccia. It contains all the constituents typical of the lunar highlands, namely igneous and granulitic lithic fragments, glass spheres and fragments, chondrules, very few agglutinates, and a shock-melted matrix. The lithic fragments belong to three different rock families: (1) magnesian granulitic metabreccias, (2) basalts and metabasalts, and (3) plutonic rocks of the ferroan anorthosite family. It is noted that the basalts and metabasalts of magnesian high alumina composition fill the gap in mineral compositions between the magnesian granulites and pristine ferroan anorthosite rocks. Glasses formed by impact reveal the same trend. For this reason, the basalts and metabasalts (and the glasses) are seen as melts derived from mixtures of the two pristine end member rock families. The granulitic metabreccias exhibit the textures and mafic mineral compositions typical of the lunar crust. Apparently they were made of early norites and troctolites. It is believed that the anorthosite that clearly belongs to the magnesian breccia group may be a larger-than-average plagioclase grain-cluster. The majority of anorthosites belong to the ferroan anorthosite suite.

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