Lead-lead age of the Bondoc meteorite

Details Lead-lead age of the Bondoc meteorite Lead-lead age of the Bondoc meteorite

Sep 1968

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1968gecoa..32.1013m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 32, Issue 9, pp.1013-1018

Physics

Scientific paper

The concentration of lead in a portion of the Bondoc meteorite was determined by the isotopic dilution technique to be 0.071 ± 0.005 ppm. Isotopic ratios of the lead in the meteorite were found to be Pb 206 / Pb 204 = 20.11, Pb 207 / Pb 204 = 18.53, and Pb 208 / Pb 204 = 39.12. The Pb 207 / Pb 204 ratio is quite high relative to the Pb 206 / Pb 204 ratio, indicating a possible lead-lead age of 4.94 × 10 9 years. This calculation is based on the assumption that the present U 238 / U 235 ratio in this meteorite is 137.7.

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