An apatite-rich, ferroan, mafic lithology from lunar meteorite ALHA81005

Details An apatite-rich, ferroan, mafic lithology from lunar meteorite ALHA81005 An apatite-rich, ferroan, mafic lithology from lunar meteorite ALHA81005

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985lpsc...15..405g&link_type=abstract

(Lunar and Planetary Institute, NASA, American Geophysical Union, et al., Lunar and Planetary Science Conference, 15th, Houston,

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Breccia, Calcium Phosphates, Lithology, Lunar Rocks, Meteoritic Composition, Anorthosite, Kreep, Olivine, Petrography, Pyroxenes, Rare Earth Elements, Meteorites, Antarctic Meteorites, Allan Hills Meteorites, Alha81005, Apatite, Ferroan Materials, Lithology, Mafic Material, Mineralogy, Clasts, Samples, Lunar, Moon, Origin, Source, Texture, Hypotheses, Pressure, Crystallization, Composition, Magma, Brecciation, Kreep, Parent Material, Volatiles, Rare Earth Elements, Abundance, Formation

Scientific paper

Antarctic meteorite Allan Hills A81005 is a polymict, anorthositic regolith breccia of lunar origin. Most lithic clasts in the meteorite 81005 are similar to those from other lunar rocks. However, some, such as 'hyperferroan' anorthosites, have not been reported before the discovery of 81005. On the basis of the composition of some granulitic polymict breccia clasts, it appears possible that other new lithologies are present. In the present paper, a description is provided of an unusual, apatite-rich, ferroan, mafic lithology, and its origin is discussed. Three clasts which appeared to contain two minerals were separated as samples ,32 ,28 and ,27. It is found in a study that the clast in ,32 and ,28 is an apatite-rich ferroan anorthositic troctolite which is probably pristine. This rock is unique among lunar samples. On the basis of an evaluation of the significance of the results of the study, it is concluded that complex processes were apparently involved in the evolution of the primitive lunar crust.

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