Volcanism in Mare Fecunditatis and Mare Crisium: Ar-Ar age studies

40Ar‐39Ar age determinations of lunar basalt meteorites Asuka 881757, Yamato 793169, Miller Range 05035, La Paz Icefield 02205, Northwest Africa 479, and basaltic breccia Elephant Moraine 96008

“…Ar-Ar ages are reported at the two standard deviation (2σ) level of uncertainty. Further details of the experimental methods and data reduction procedures are given in Turner (1998), Fernandes et al (2000) and Fernandes and Burgess (2005).…”

“…1). This may not be surprising as the area that shows a longer volcanic activity, based on surface ages obtained by crater counting (Hiesinger et al 2000 and is within and adjacent to the incompatible-rich (and radioactive) Procellarum-KREEP terrain (PKT; Jolliff et al 2000;Korotev et al 2000), which makes it a long-lived heat source capable of sustaining melting in this area of the Moon (Hess and Parmentier 1999;Hess 2000;Head and Wilson 1992;Wieczorek et al 2001;Fernandes and Burgess 2005). The most likely source area for these meteorites has been determined to be adjacent to within the PKT and a few close to the Apollo-Luna landing sites.…”

Petrogenesis and chronology of lunar meteorite Northwest Africa 4472: A KREEPy regolith breccia from the Moon

“…40 Ar-39 Ar results are reported at the 2 SD (2r) level of uncertainty. Further details of the experimental methods, blanks and data reduction procedures are given in Burgess and Turner (1998), Fernandes et al (2000Fernandes et al ( , 2003 and Fernandes and Burgess (2005).…”

Geochemistry, petrology and ages of the lunar meteorites Kalahari 008 and 009: New constraints on early lunar evolution

“…Ar-Ar ages are reported with uncertainties of two standard deviations (2r). Further details of the experimental methods and data reduction procedures are given by Fernandes and Burgess (2005).…”