Noble gases in the howardites Bholghati and Kapoeta

Details Noble gases in the howardites Bholghati and Kapoeta Noble gases in the howardites Bholghati and Kapoeta

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54.2183s&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 54, Aug. 1990, p. 2183-2194.

Computer Science

5

Achondrites, Breccia, Kapoeta Achondrite, Rare Gases, Regolith, Xenon Isotopes, Chronology, Grain Size, Nuclear Fission, Radioactive Isotopes, Solar System

Scientific paper

Analyses of noble gases in whole rock samples of the howardites Bholghati and Kapoeta and grain-size separates of Kapoeta yield evidence for excesses of the Xe isotopes Xe-129 , Xe-131, Xe-132, Xe-134, and Xe-136 in a low-temperture component, similar to lunar excess fission Xe. Such a component may be able to provide chronometric information if the relative abundances of radioactive progenitors (I-129, Pu-244, and U-238) can be determined, but the isotopic spectra obtained are not sufficiently precise to do so. Eucritic clast BH-5 in Bholghati contains Xe produced in situ by the decay of Pu-244. Calculated fission Xe retention ages are 30-70 Ma after the formation of the solar system, consistent with the apparent presence of Sm-146 decay products. Both the clast and the matrix of Bholghati have K-Ar ages of about 2 Ga, suggesting a common thermal event at least that recently.

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