Studies of the release of radiogenic Xe-129 from Bjurboele: Evidence against simple diffusion models

Details Studies of the release of radiogenic Xe-129 from Bjurboele: Evidence against simple diffusion models Studies of the release of radiogenic Xe-129 from Bjurboele: Evidence against simple diffusion models

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993lpi....24..225b&link_type=abstract

In Lunar and Planetary Inst., Twenty-fourth Lunar and Planetary Science Conference. Part 1: A-F p 225-226 (SEE N94-12015 01-91)

Other

Chronometers, Iodine Isotopes, Radiogenic Materials, Solar System Evolution, Xenon 129, Diffusion, Metamorphism (Geology), Minerals, Solidification

Scientific paper

The I-Xe system, based on the decay of 15.7 Ma I-129, is a potentially precise chronometer of early solar system events. However, it is not known how the system responded to thermal events during the post-formation histories of ordinary chondrites, severely limiting the usefulness of this system. Isothermal experiments on Bjurbole for different heating durations suggest that at least three domains are responsible for the thermal release of radiogenic Xe-129 (Xe*-129) and that the system may be less susceptible to thermal resetting than some calculations indicated. Two scenarios for the release of Xe*-129 were proposed. In one, the mobility of Xe*-129 is governed by diffusion in mineral grains. This leads to predicted closure temperatures comparable to, or less than, metamorphic temperatures. In the second, mineral grains that solidified at specific temperatures trapped I-129 within them, and the resulting Xe*-129 is only released when those minerals melt, such that isotopic closure occurs at the temperature of solidification.

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