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Precision measurement of lead isotopes ratios: preliminary analyses from the U.S. mine, Bingham Canyon, Utah

Earth and Planetary Science Letters

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Abstract

A gas-source mass spectrometer has been constructed for the precise measurement of lead isotope ratios. Sixteen analyses on 4 different preparations of the same galena made over a period of 2 months gave 95% confidence limits (per analysis) of 206Pb/204Pb = 0.080%, 207Pb/206Pb = 0.042% and208Pb/206Pb = 0.046%. Eight samples from the U.S. mine in the Bingham district have a linear relationship over the 1% range of their 206Pb/204Pb ratios. The simplest model fitting these data suggests that the lead was separated from a primary system (??=8.98) 1630??150 m.y. ago and subsequently mixed with a radiogenic lead of similar age; biotite K-Ar dates for altered intrusive rocks associated with the ores provide an apparent age of mineralization and suggest that isotopic evolution of the lead was terminated about 36 m.y. ago. ?? 1967.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Precision measurement of lead isotopes ratios: preliminary analyses from the U.S. mine, Bingham Canyon, Utah
Series title:
Earth and Planetary Science Letters
Volume
2
Issue:
5
Year Published:
1967
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Earth and Planetary Science Letters
First page:
489
Last page:
499