Younger Age for Oldest Martian MeteoriteYounger Age for Oldest Martian Meteorite Long Geologic History.

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Younger Age for Oldest Martian MeteoriteYounger Age for Oldest Martian Meteorite Long Geologic History Formation by crystal accumulation in a magma chamber Shocked and crushed by impact Aqueous alteration and deposition of carbonate globules Isotopic systems, hence ages, affected by shock and alteration

Younger Age for Oldest Martian MeteoriteYounger Age for Oldest Martian Meteorite Igneous formation age of ALH84001 is 4.09 Ga, much younger than the previously-reported Sm-Nd age of 4.50 Ga.

Younger Age for Oldest Martian MeteoriteYounger Age for Oldest Martian Meteorite Next step: Reconcile igneous, impact, and alteration events recorded in ALH84001 with ages of impact basins on Mars. Frey (2010)