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Martian Meteorite Ages and Implications for Martian Cratering History

机译：火星陨石年代及对火星陨石历史的启示

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New radiometrically determined ages of Martian meteorites add to the growing number with crystallization ages < approximately 1.4 Ga. The observation of mainly geologically young ages for the Martian meteorites, the only exception being the approximately 4.5 Ga ALH84001 (1), is paradoxical when viewed in context of a Martian surface thought to be mostly much older as inferred from the surface density of meteorite craters (2). There appears to be at least a twofold difference between the observed ages of Martian meteorites and their expected ages as inferred from the ages of Martian surfaces obtained from crater densities.

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