Lunar Impact History from 40Ar/39Ar Dating of Glass Spherules

Details Lunar Impact History from 40Ar/39Ar Dating of Glass Spherules Lunar Impact History from 40Ar/39Ar Dating of Glass Spherules

Mar 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000sci...287.1785c&link_type=abstract

Science, Volume 287, Issue 5459, pp. 1785-1788 (2000).

Physics

62

Scientific paper

Lunar spherules are small glass beads that are formed mainly as a result of small impacts on the lunar surface; the ages of these impacts can be determined by the 40Ar/39Ar isochron technique. Here, 155 spherules separated from 1 gram of Apollo 14 soil were analyzed using this technique. The data show that over the last ~3.5 billion years, the cratering rate decreased by a factor of 2 to 3 to a low about 500 to 600 million years ago, then increased by a factor of 3.7 +/- 1.2 in the last 400 million years. This latter period coincided with rapid biotic evolutionary radiation on Earth.

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