Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1973
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973e%26psl..20..125k&link_type=abstract
Earth and Planetary Science Letters, Volume 20, Issue 1, p. 125-130.
Astronomy and Astrophysics
Astrophysics
12
Scientific paper
The 39Ar/40Ar gas retention age of the subfloor basalt 75055 is (3.82 +/- 0.05) × 109 yr; its Ca/38Ar exposure age is (85 +/- 10) × 106 yr (Camelot crater age). The ages of the matrix material of greenish-grey breccia 76055 are (4.05 × 0.07) × 109 and (120+/-15)×106 yr, respectively. The gas retention age of 75055 raises the lower limit for the time of formation of all lunar basins. Of the breccia represents metamorphosed Serenitatis basin ejecta, then the formation of at least 28 lunar basins occurred between 3.82 × 109 and 4.05 × 109 yr ago. The formation of these basins during a timespan of only about 0.2 × 109 yr is consistent with the very rapid decrease of the flux of crater-forming projectiles that collided with the Moon about 4.0 × 109 yr ago. According to Hartman and Wood this could be due to a catastrophic event in the Earth-Moon system at that time. On leave from the Departments of Geology and Space Science, Rice University, Houston, Texas, USA.
Heymann Dieter
Horn Peter
Kirsten Toralf
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