Physics
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983georl..10..783t&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 10, Sept. 1983, p. 783-786.
Physics
42
Basalt, Lunar Composition, Lunar Maria, Meteoritic Composition, Lithology, Lunar Evolution, Lunar Rocks, Mineralogy, Petrography, Pyroxenes, Meteorites, Antarctic Meteorites, Allan Hills Meteorites, Alha81005, Moon, Origin, Description, Physical Properties, Characteristics, Source, Samples, Meteorite, Petrography, Clasts, Maria, Basalts, Titanium, Pyroxene, Composition, Mineralogy, Lithology, Fragments
Scientific paper
Attention is given to the endogenous (or primary) lithologies of the lunar crust that can be inferred from the terrae clasts and to the significance of a fragment of very low titanium (VLT) mare basalt in thin section, ALHA 81005,9. Fragments of the norite and harzburgite have mineral compositions similar to that of ferroan anorthosite, and a clast of ferroan anorthosite has pyroxenes with lower molar Mg/(Mg+Fe) than in known pristine rocks. It is inferred that the Mg-suite protoliths for the clasts of intermediate composition are magnesian troctolites, spinel troctolites, and feldspathic lherzolites. Whereas clasts of these lithologies are not present in ALHA 81005,9, mineral fragments from them are. Based on the molar Mg/(Mg+Fe) ratio and Cr content of its pyroxenes, a single basaltic clast is determined to be of mare origin. The composition of its plagioclase and the molar Ti/(Ti+Cr) ratios of its pyroxenes suggest that the clast is a fragment of VLT mare basalt. It is noted that if this basalt is significantly younger than the last basin-forming impact event, which was approximately 3.9 x 10 to the 9th years ago, then its presence probably constrains the source crater for ALHA 81005 to be within a hundred kilometers of a VLT mare basalt flow.
Drake Michael J.
Treiman Allan H.
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