Other
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mbns.conf...31k&link_type=abstract
The Moon Beyond 2002: Next Steps in Lunar Science and Exploration, p. 31
Other
Lunar Maria, Lunar Craters, Ejecta, Geochronology, Models, Lunar Geology
Scientific paper
We do not know which, if any, rocks of the Apollo collection record the age of the Nectaris impact. However, the age of Nectaris is generally accepted to be 3.92 Gyr on the basis of the careful analysis of breccia ages. In essence, the argument is based on the following observations and assumptions, among others. Of the Apollo sites, Apollo 16 lies closest to the Nectaris basin, but Imbrium is bigger and its deposits overlie some Nectaris deposits because it's older. Nevertheless, from ejecta deposit modeling, it would predate Imbrium. Granulitic breccias are common at the site. Although it is not known in which basin or crater they formed, they are not likely products of the Imbrium impact, and their measured ages would not likely be affected by the Imbrium impact. They are also not likely products of post-Nectarian, pre-Imbrian impacts that formed local craters. Their ages, therefore, provide an upper limit to the Nectaris age. Most granulitic breccias, and most materials of the Apollo 16 site, have 3.9 Gyr ages, so this age likely corresponds to a basin, probably Nectaris. We review some recent data, observations, hypotheses, models, and opinions.
Gillis Jeffery J.
Haskin Larry A.
Jolliff B. J.
Korotev Randy L.
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