Gas source mass spectrometry of trace leads from Sudbury, Ontario

Details Gas source mass spectrometry of trace leads from Sudbury, Ontario Gas source mass spectrometry of trace leads from Sudbury, Ontario

Apr 1964

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1964gecoa..28..455u&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 28, Issue 4, pp.455-469

Mathematics

Logic

3

Scientific paper

The measurement of lead isotope abundances with a gas source mass spectrometer has been limited to lead ores and minerals. A free radical technique for the preparation of lead tetramethyl is described which has reduced by a substantial amount the sample size necessary for a precise gas source analysis. In this way, the range of minerals which may be studied by means of a gas source mass spectrometer has been greatly extended. The free radical method has been applied to the study of lead isotope abundance variations in the mining district of Sudbury, Ontario. The analysis of lead from various sulphides has yielded lead isotope ratios which are linearly related on a plot of Pb 207 /Pb 204 vs. Pb 206 /Pb 204 with a slope of 0.131 ± 0.003; the standard deviation of points from their best straight line is 0.37 per cent of the average Pb 207 /Pb 204 value. (The intercomparison technique previously used by us to determine the ratios of ordinary leads was not used for these analyses.) It is concluded that the linear relationship is the result of just two geological events, which fact simplifies the possible interpretations. The maximum times of these two events are 21.30 ± 50 m . y . and 1280 ± 50 m . y . respectively. Two interpretations of the results are suggested. The first gives ages of 1950 and 350 m.y. for the primary and secondary events. The two events in the second interpretation are considered to have occurred 1600 and 950 m.y. ag. The second interpretation is more easily defended on geological grounds.

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