Physics
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..285d&link_type=abstract
Lunar and Planetary Science, volume 27, page 285
Physics
1
Age: Argon-40/Argon-39, Basins: Formation, Basins: Lunar, Rocks: Impact Melt, Serenitatis
Scientific paper
We are attempting to refine the chronology of lunar basin formation in order to test the several hypotheses for the early bombardment history of the Moon by large impactors, which range from gradually declining early bombardment to late cataclysmic bombardment only. Our approach is to use a laser system to obtain high-resolution 40Ar/39Ar ages on carefully characterized samples of impact melt rocks. The use of the laser system allows us to obtain high resolution age spectra on very small (sub-milligram) samples, thus avoiding or minimizing the effects of older clasts. Using these methods, we have determined an age of 3,893 +/- 9Ma for the Serenitatis impact, which is significantly older than our maximum age for the Imbrium impact of 3,867 Ma measured using the same methods.
Brent Dalrymple G.
Ryder Graham
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