The Rock Record of the Chronology of Lunar Impacts

Details The Rock Record of the Chronology of Lunar Impacts The Rock Record of the Chronology of Lunar Impacts

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dps....40.5704s&link_type=abstract

American Astronomical Society, DPS meeting #40, #57.04; Bulletin of the American Astronomical Society, Vol. 40, p.502

Astronomy and Astrophysics

Astronomy

Scientific paper

The idea of a "lunar cataclysm” or "late heavy bombardment” arose when Turner et al. (1973) and Tera et al. (1974) found that the ages of the samples returned by the Apollo astronauts clustered at slightly less than 4 Ga when measured by a variety of isotope geochronology systems. Since then, 40Ar-39Ar analyses of impact melt clasts from lunar meteorites, glass spherules from the Apollo sites and heavily-shocked meteorites from asteroidal parent bodies have all contributed to a more nuanced picture of the impact record in rocks. There continues to be a dearth of impact ages between 4.4 and 4.0 Ga, but most of the sample sets contain ages between 3.5 and 4.0 Ga. The "Nice” model provides an elegant dynamical explanation for a "cataclysm” (Gomes et al., 2005), but the details of the rock record appear to be inconsistent with the simplest version of such a model.
This work is supported by the NASA Cosmochemistry program.

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