39Ar - 40Ar age of the Ibitira eucrite and constraints on the time of pyroxene equilibration.

Details 39Ar - 40Ar age of the Ibitira eucrite and constraints on the time of pyroxene equilibration. 39Ar - 40Ar age of the Ibitira eucrite and constraints on the time of pyroxene equilibration.

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995gecoa..59.4317b&link_type=abstract

Geochimica et Cosmochimica Acta, Vol. 59, No. 20, p. 4317 - 4322

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12

Achondrites: Ages

Scientific paper

The authors determined a 39Ar - 40Ar age of 4.495±0.015 Ga for the unbrecciated Ibitira eucrite. This age ranks among the oldest 39Ar - 40Ar ages for eucrites and suggests that Ibitira excaped the widespread impact resetting of K-Ar ages ≡4.1 - 3.5 Ga ago indicated by other HED meteorites.

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