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The Schwartzwalder uranium deposit, II: Age of uranium mineralization and lead isotope constraints on genesis.

Economic Geology

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, , and

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Abstract

Schwartzwalder ores have high amounts of initial (common) Pb that was both variable and relatively radiogenic in its isotope ratios. Assuming the common Pb in these ores to have sources of similar age and similar Th/U, samples with initial Pb isotope ratios are identified - and others with variable initial ratios are normalized - to obtain U-Pb isochrons yielding an early Laramide age of 69.3 + or - 1.1 m.y. for the ores. The initial Pb-isotope systematics indicate local sources of U, dispersed in concentrations <100 ppm, in rocks of 1730 + or - 130 m.y. age. -G.J.N.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
The Schwartzwalder uranium deposit, II: Age of uranium mineralization and lead isotope constraints on genesis.
Series title:
Economic Geology
Volume
80
Issue:
7
Year Published:
1985
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Economic Geology
First page:
1858
Last page:
1871
Number of Pages:
14