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 ∼60 Myr after CAI formation, consistent with 147Sm–143Nd ages for ferroan anorthosites. The absence of 182Hf-induced 182W variations in the Moon is consistent with formation of the Moon at 62−10+90Myr after CAI formation that has been inferred based on the indistinguishable 182W/184W ratios of the bulk Moon and the bulk silicate Earth. The uncertainties on 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 ∼100 Myr.