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Isotopic study of some Colorado Plateau ores

Donald S. Miller and John Laurence Kulp
Isotopic study of some Colorado Plateau ores
Economic Geology and the Bulletin of the Society of Economic Geologists (December 1958) 53 (8): 937-948


A number of selected uranium ore specimens from several localities have been analyzed for uranium and lead in both pitchblende and galena phases by isotope dilution techniques and the lead isotopic abundance determined. It is shown that the hypothesis of hydrothermal deposition of uranium accompanied by old radiogenic lead from the basement at one time about 60 m.y. ago does not satisfy the isotopic data. A new hypothesis is presented which requires local sources with high U/Th and U/Pb ratios, variable radon leakage, suitable ground water movement, and deposition at the site of H (sub 2) S production at low temperature. This hypothesis can explain the age discordances and the lead isotope abundances in galena. It is possible from the isotopic data to have all deposition occurring within the last five million years but it does not preclude other periods of deposition such as in Laramide time. The isotopic ages are apparent ages only and bear no direct relation to the time of deposition. The isotopic ratios, however, provide information which may be used to restrict theories of origin.

ISSN: 0361-0128
EISSN: 1554-0774
Serial Title: Economic Geology and the Bulletin of the Society of Economic Geologists
Serial Volume: 53
Serial Issue: 8
Title: Isotopic study of some Colorado Plateau ores
Pages: 937-948
Published: 195812
Text Language: English
Publisher: Economic Geology Publishing Company, Lancaster, PA, United States
Accession Number: 1959-021170
Categories: Economic geology of ore deposits
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: tables
N37°00'00" - N41°00'00", W109°00'00" - W102°00'00"
N33°40'00" - N40°30'00", W114°00'00" - W106°19'60"
Source Note: discussion by L. R. Stieff and T. W. Stern, p. 752, June-July 1959.
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Society of Economic Geologists. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States
Update Code: 1959
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