The anomalous nature of Ivigtut lead

Details The anomalous nature of Ivigtut lead The anomalous nature of Ivigtut lead

Sep 1964

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1964gecoa..28.1389u&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 28, Issue 9, pp.1389-1396

Computer Science

Scientific paper

Kanasewich and Slawson (1964) have recently suggested that the lead of Ivigtut, GreenLond, which is very unusual isotopically, is anomalous in the sense that it has developed in a multi-stage system. This interpretation is based on eight galena analyses from Ivigtut, which agree with their mean ratio within 1/8 of one per cent, and one analysis from Laxebunden, 12 km N.E. of Ivigtut. This paper presents five additional analyses from this area which are considered to establish definitively the anomalous nature of the lead. The samples, which consist of pyrite and galena, were compared with a standard in a gas-source mass spectrometer using a free radical technique for the preparation of lead tetramethyl. The lead isotope ratios from Ivigtut are linearly related on a plot of Pb 207 /Pb 204 vs. Pb 206 /Pb 204 with a slope of 0.113 ± 0.004. The deviation of points from their best straight line is 0.03 per cent of the average Pb 207 /Pb 204 ratio. The isotopic analyses are interpreted to indicate that the Ivigtut leads were deposited at a time not earlier than 1100 ±40 m.y. ago and that the source material for the anomalous lead component came into existence between 1880 ± 60 m.y. and 1100 ± 40 m.y. ago. Ordinary lead mineralization occurred at least 2980 ± 10 m.y. ago. A possible application of lead isotope studies to problems of continental drift is discussed.

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