Other
Scientific paper
Feb 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009icar..199..245t&link_type=abstract
Icarus, Volume 199, Issue 2, p. 245-249.
Other
5
Scientific paper
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.
Bourdon Bernard
Kleine Thorsten
Palme Herbert
Touboul Mathieu
Wieler Rainer
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