39Ar-40Ar Ages of Acapulcoites and Early Parent Body Metamorphism

Details 39Ar-40Ar Ages of Acapulcoites and Early Parent Body Metamorphism 39Ar-40Ar Ages of Acapulcoites and Early Parent Body Metamorphism

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..127b&link_type=abstract

Lunar and Planetary Science, volume 27, page 127

Physics

1

Acapulcoites, Age: Argon-39/Argon-40, Parent Body: Metamorphism

Scientific paper

Acapulcoite Chronology: We determined precise 39Ar-40Ar ages for five acapulcoites, ALHA81261, ALHA81187, EET84302, Monument Draw, and Acapulco (Fig. 1). These ages are 4.511 +/-0.007, 4.507 +/-0.024, 4.512 +/-0.017, 4.517 +/-0.006, and 4.510 +/-0.011 Ga, respectively. Each release, with only modest Ar loss at lower meteorite shows a constant age over a large fraction of its 39Ar temperatures. All five meteorites are consistent with a common 39Ar-40Ar age of 4.51 +/-0.01 Ga. When the age uncertainty (<0.5%) of the NL-25 hornblende age monitor is considered, the absolute K-Ar age of these five acapulcoites is 4.51 +/-0.02 Ga.

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