An Update on the I-Xe Chronometer

Details An Update on the I-Xe Chronometer An Update on the I-Xe Chronometer

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..155b&link_type=abstract

Lunar and Planetary Science, volume 27, page 155

Mathematics

Logic

Feldspar, Iodine Carrier, Iodine-Xenon: Dating, Phosphates, Troilite

Scientific paper

The I-Xe system, long regarded as a sensitive chronometer for early meteorite evolution, has yet to achieve a clear meaningful interpretation. We have been studying the I-Xe system on single mineral phases (phosphates from ordinary chondrites with high-precision Pb-Pb ages) in an attempt to eliminate possible non-chronometric complications, and achieve the simplest interpretation possible. Thus far, we have found two phosphate samples (H6 Guarena and H6 Kernouve) whose I-Xe ages are consistent with their Pb-Pb ages, and one sample (L6 Bruderheim) that appears inconsistent. These I-Xe ages are listed in Table 1 as a range of Dt referenced to Acapulco phosphate. Bruderheim is shocked, which may have reset the I-Xe chronometer, and Guarena and Kernouve ages have large uncertainties due to small sample size. Thus, at this time, we can report no convincing evidence of the chronological validity of the I-Xe system. However, an analysis of six additional phosphate separates (three of which have been Pb-Pb dated by Gopel et al.) is in progress, and updated results will be reported at this meeting.

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