Precision intercomparisons of lead isotope ratios : Ivigtut, Greenland

Details Precision intercomparisons of lead isotope ratios : Ivigtut, Greenland Precision intercomparisons of lead isotope ratios : Ivigtut, Greenland

May 1964

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1964gecoa..28..541k&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 28, Issue 5, pp.541-549

Physics

1

Scientific paper

In conjunction with the National Bureau of Standards program we have analysed isotopically the NBS 200 galena and iodide from Ivigtut, Greenland. Five additional samples were analysed also. All of these agree within of one per cent. The lead isotope ratios obtained are Pb 206 / Pb 204 = 14.70, Pb 207 / Pb 204 = 14.82, and Pb 208 / Pb 204 = 34.92. An interpretation for the origin of these leads is suggested through the use of a simplified multi-stage model. The first event occurred at least 3000 m.y. ago and the last event probably took place about 1200 m.y. ago. Ivigtut leads are by this interpretation anomalous. A reasonable crustal Th/U ratio of 4.6 is obtained from the model.

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