Ages of pristine noritic clasts from lunar breccias 15445 and 15455

Details Ages of pristine noritic clasts from lunar breccias 15445 and 15455 Ages of pristine noritic clasts from lunar breccias 15445 and 15455

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57..915s&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 57, no. 4, p. 915-931.

Computer Science

18

Breccia, Lunar Surface, Neodymium Isotopes, Rubidium Isotopes, Samarium Isotopes, Strontium Isotopes, Apollo 15 Flight, Lunar Craters, Lunar Rocks, Moon, Samples, Lunar, Neodymium, Isotopic Ratios, Samarium, Crust, Age, Breccia, Clasts, Apollo 15 Mission, 15445, 15455, Spur, Age Dating, Laboratory Studies, Isochrons, Description, Parent Material, Magma, Rubidium, Strontium, Argon, Comparisons, Procedure, Techniques, Matrix, Rare Earth Elements, Abundance, Plutonic Rocks, Highlands, Anorthosite, Norite, Pris

Scientific paper

The Rb-Sr and Sm-Nd isotopic ages were determined for two Apollo 15 pristine lunar breccias, 15445 and 15455, collected near Spur Crater on the Apennine Front. The analyses of mineral separates from two norite samples in breccia 15445 showed that the Sm-Nd isotopic system for both norites from the large Clast B of 15445 was well defined, yielding precise ages of 4.28 +/- 0.03 Ga and 4.46 +/- 0.07 Ga, suggesting that the Cast B is a mixture of two or more lithologies. The overall age results indicate that some Mg-suite rocks are as old as ferroan-anorthosite-suite rocks. Moreover, age data of three major crustal rocks (a Mg suite, a ferroan-anorthosite suite, and an evolved suite) show that they all have variable ages.

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