Tungsten isotopes in ferroan anorthosites: Implications for the age of the Moon and lifetime of its magma ocean

New W isotope data for ferroan anorthosites 60025 and 62255 and low-Ti mare basalt 15555 show that these samples, contrary to previous reports [Lee, D.C., et al., 1997. Science 278, 1098-1103: Lee, D.C., et al., 2002. Earth Planet. Sci. Lett. 198, 267-274], have a W isotope composition that is indistinguishable from KREEP and other mare basalts. This requires crust extraction on the Moon later than similar to 60 Myr after CAI formation, consistent with (SM)-S-147-Nd-143 ages for ferroan anorthosites. The absence of Hf-182-induced W-182 variations in the Moon is consistent with formation of the Moon at 62(10)(+90) Myr after CAI formation 10 that has been inferred based oil the indistinguishable W-182/W-184 ratios of the bulk Moon and the bulk silicate Earth. The uncertainties oil the age of the Moon and the age of the oldest lunar samples currently hamper a precise determination of the duration of magma ocean solidification and are consistent with both an almost immediate crystallization and a more protracted timescale of similar to 100 Myr. (c) 2008 Elsevier Inc. All rights reserved.