Cosmic Ray Exposure Ages and Trapped Noble Gases in Two Acapulcoites and Two Lodranites: A Common Origin?

Details Cosmic Ray Exposure Ages and Trapped Noble Gases in Two Acapulcoites and Two Lodranites: A Common Origin? Cosmic Ray Exposure Ages and Trapped Noble Gases in Two Acapulcoites and Two Lodranites: A Common Origin?

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..393g&link_type=abstract

Lunar and Planetary Science, volume 27, page 393

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Acapulcoites, Cosmic Rays: Exposure Ages, Lodranites, Xenon: Trapped, Xenon-129/Xenon-132

Scientific paper

Cosmogenic He, Ne, and Ar have been measured in the acapulcoites ALH81187 and EET84302 and in the lodranites LEW88280 and MAC88177. Cosmic ray exposure ages calculated from these data show some scatter, but suggest ages of ~5 Ma. When combined with results reported by others, most acapulcoites and lodranites suggest a common exposure age. Trapped 132Xe concentrations in our samples were ~0.25-21 x10-10 cm3/g. ALH81187 shows an unusually high 129Xe/132Xe ratio of 5.7, whereas three other acapulcoites and lodranites give values of ~1.09-1.4. The higher 129Xe/132Xe for ALH81187 probably does not have time significance, but is likely due to a larger trapped I/Xe ratio.

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