Xenon-Iodine Dating: Sharp Isochronism in Chondrites

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Science  14 Apr 1967:
Vol. 156, Issue 3772, pp. 233-236
DOI: 10.1126/science.156.3772.233


Measurements of the accumulation of Xel29 from radioactive decay of extinct 1129 in meteorites show that the 1129/ 1127 ratio in high-temperature minerals in diverse chondrites was 10-4 at the time of cooling. The uniformity in the ratio indicates that the minerals cooled simultaneously within 1 or 2 million years.

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