IXe Dating of Silicates from Toluca Iron
A Reynolds type heating experiment on neutron irradiated silicates from Toluca indicates that the high temperatures sites began to retain radiogenic 129Xe when the 129I127I ratio was (1.4±0.4) × 10-3. This ratio suggests that Toluca silicates formed 65-8 +6 million years before the chondrites and the Shallowater achondrite.
E. C. Alexander et al., "IXe Dating of Silicates from Toluca Iron," Earth and Planetary Science Letters, vol. 6, pp. 355-358, Elsevier, Apr 1969.
The definitive version is available at https://doi.org/10.1016/0012-821X(69)90185-X
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