Argon-40-Argon-39 Dating of Apollo Sample 15555

Details Argon-40-Argon-39 Dating of Apollo Sample 15555 Argon-40-Argon-39 Dating of Apollo Sample 15555

Jan 1972

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972sci...175..417a&link_type=abstract

Science, Volume 175, Issue 4020, pp. 417-419

Physics

3

Scientific paper

An age of 3.33 ± 0.05 × 109 years was obtained for Apollo 15 sample 15555 by argon-40-argon-39 dating. The age of rock 15555, a basalt from the rim of Hadley Rille, establishes an upper limit to the age of the rille. The basalt flows filling the Hadley Rille section of the Imbrium basin postdate the formation of the basin-as measured by the Apollo 14 samples of the Fra Mauro formation-by at least 500 × 106 years. Therefore, the mare basalts cannot be simple impact melts but rather must result from some igneous activity on the moon.

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