A 3.91 Billion Year Age for Apollo 12 High-Thorium Impact-Melt Breccias: Products of Imbrium, or an Older Impact Basin in the Procellarum KREEP Terrane?

Details A 3.91 Billion Year Age for Apollo 12 High-Thorium Impact-Melt Breccias: Products of Imbrium, or an Older Impact Basin in the Procellarum KREEP Terrane? A 3.91 Billion Year Age for Apollo 12 High-Thorium Impact-Melt Breccias: Products of Imbrium, or an Older Impact Basin in the Procellarum KREEP Terrane?

Mar 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010lpi....41.2477l&link_type=abstract

41st Lunar and Planetary Science Conference, held March 1-5, 2010 in The Woodlands, Texas. LPI Contribution No. 1533, p.2477

Physics

Scientific paper

SHRIMP-II dating of zircons within fragments of Apollo 12 high-Th IMB
yield 207Pb/206Pb crystallization ages of 3.913±7 Ga, the same
age as the IMB lithology in lunar meteorite SaU 169, and older than the
accepted age range of the Imbrium Basin.

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