Other
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994gecoa..58.3093b&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 58, Issue 14, pp.3093-3100
Other
13
Scientific paper
Previous investigations have suggested that KREEP glass found in 12033 and other Apollo 12 soils was ejected from the crater Copernicus and deposited in a ray across this site. Soil fragment 12033,507 has been described as having a core of felsite (granitic) composition with a KREEP-glass shell. 39 Ar- 40 Ar dating of a sample of this granite material shows almost complete resetting 800 ± 15 Ma ago. We interpret this age as giving the most precise determination to date for the formation time of Copernicus. Cosmic ray exposure ages of the granite and associated KREEP glass in soil 12033, about 250 Ma, are much less than the K-Ar age and suggest a complex, postejection burial history. The 39 Ar- 40 Ar age of another granite fragment, 14303,204, is determined to be in the range 3.80-3.85 Ga. This age is in agreement with 39 Ar- 40 Ar ages determined for a few other lunar granites and is interpreted to represent resetting by a large, basin-forming impact, probably Imbrium.
Bogard Donald D.
Garrison Daniel H.
Nyquist Larry E.
Shih Chia-You
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