Computer Science
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998piase.107..413h&link_type=abstract
Proc. Indian Acad. Sci., Earth Planet. Sci., Vol. 107, No. 4, p. 413 - 423
Computer Science
Meteorites: Ages
Scientific paper
129Xe from the decay of the now extinct 16.7 Ma 129I accumulates in iodine-bearing sites and since most iodine host phases are secondary the I-Xe system is typically a chronometer for post-formational processes. The validity of the I-Xe chronometer is confirmed by comparison with Pb-Pb ages on phosphate and feldspar separates from twelve meteorites. Phosphate separates are found to be concordant with Pb-Pb for all six samples in which useful I-Xe data were obtained. Feldspar is a better iodine host than apatite in H chondrites, typically providing good I-Xe isochrons. These too are concordant with the Pb-Pb ages of the corresponding phosphates for five out of six feldspar separates. The exception is Allegan whose feldspar yields one of the oldest I-Xe ages observed, similar to those observed, similar to those for CI and CM magnetites. The authors attribute this to a more primary mineralization predating the secondary phosphate from which the comparison Pb-Pb age was obtained. Absolute I-Xe ages found using the reported Pb-Pb age of Acapulco phosphate provide an absolute I-Xe age of 4.566±0.002 Ga for both Shallowater and Bjurbole irradiation standards. This allows relative I-Xe ages to be interpreted in the context of absolute ages.
Brazzle Robert Harald
Hohenberg Charles M.
Meshik Alex P.
Pravdivtseva Olga V.
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