Mathematics – Probability
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991icar...92..217c&link_type=abstract
Icarus (ISSN 0019-1035), vol. 92, Aug. 1991, p. 217-233.
Mathematics
Probability
67
Geochemistry, Lunar Craters, Lunar Crust, Meteorite Collisions, Planetary Evolution, Asteroids, Meteoritic Damage, Planetary Composition
Scientific paper
Results of an analytical fit to the lunar cratering record are shown to be in good agreement with geochemical estimates of the meteoritic component mixed into the lunar crust. Upon a gravitational scaling to the earth consistent with the statistical probability that earth impactors were more massive than lunar ones, an estimate is obtained of 1.5 x 10 to the 22nd kg of material accumulated by the earth begining 4.4 Gyr ago. This is in excellent agreement with estimates of postcore-formation meteoritic input derived from geochemical considerations of the abundances of highly siderophile elements in the terrestrial mantle. Approximate agreement is therefore established between the lunar cratering record scaling and both lunar and terrestrial geochemical constraints.
Chyba Christopher F.
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