Computer Science
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987e%26psl..84...15h&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 84, no. 1, June 1987, p. 15-21.
Computer Science
20
Isotopic Enrichment, Lunar Composition, Lunar Crust, Lunar Evolution, Chemical Composition, Crystallization, Mineralogy, Moon, Samples, Lunar, 60025, Apollo 16, Crust, Isotopes, Analysis, Isotopic Ratios, Lead, Age, Dating Method, Contamination, Comparisons, Ferroan Material, Anorthosite, Crystallization Age, Procedure
Scientific paper
An analysis of three plagioclase-rich fractions and one mafic fraction from ferroan anorthosite 60025 is presented. The observed Pb-206/Pb-204 ratios are found to vary between 52.5 and 60.5, all much greater than the ratio for terrestrial contamination. The apparent Pb-Pb age found does not correlate with the Pb-206/Pb-204 ratios and U contents of the samples, suggesting that it is not controlled by terrestrial lead contamination. The time-averaged mu values found for the plagioclase leads are much lower than the values noted for mafic rocks or their sources, indicating that the anorthosite lead has never been associated for a substantial length of time with any high-mu source. The data suggest that the present average model Pb ages of 4.51 + or - 0.01 AE closely approximate the crystallization age for the plagioclase fraction of the anorthosite, dating back to an early phase in lunar history.
Hanan Barry B.
Tilton George R.
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