Distribution of Xe Components in the IAB Iron EL Taco: Chronological Implications

Details Distribution of Xe Components in the IAB Iron EL Taco: Chronological Implications Distribution of Xe Components in the IAB Iron EL Taco: Chronological Implications

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..829m&link_type=abstract

Lunar and Planetary Science, volume 27, page 829

Mathematics

Logic

129-Xenon: Radiogenic, Chronology, Iodine-Xenon: Dating, Meteorites: Iron, Xenon

Scientific paper

Xenon abundances and isotopic ratios in mineral phases from the metal, from the interface of metal and silicates, and from the silicate inclusions of El Taco IAB iron meteorite are studied. The concentrations of trapped xenon in the separates are two orders of magnitude lower than reported for the bulk. The isotopic compositions of Xe in the analyzed phases reveal no fission components, but excesses of ^129Xe are observed in all separates. The release of this component in the intermediate pyrolysis temperature steps shows correlated excesses at ^128Xe, implying that ^129Xe excesses from ^129I were produced in situ. The combustion steps, on the other hand, suggest the possible presence of a reservoir containing only radiogenic ^129Xe. The chronological significance of the ^129Xe data is discussed.

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