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GEOREF RECORD

Isotopic constitution of radiogenic leads and the measurement of geological time

Clifford B. Collins, Ronald McCunn Farquhar and Richard Doncaster Russell
Isotopic constitution of radiogenic leads and the measurement of geological time
Bulletin of the Geological Society of America (January 1954) 65 (1): 1-21

Abstract

Isotopic abundances are reported for lead extracted from 1 galena and 96 uranium minerals. The radiogenic leads are mostly from the Athabasca province of the Canadian Shield. Chemical analyses are given for 9 of the uranium-bearing minerals. Ages have been calculated from the radiogenic Pb (super 207) /Pb (super 206) ratios for all samples with sufficiently low common lead contamination, and from the Pb (super 206) /U (super 238) ratios for the chemically analyzed samples. These have been used to establish that the Athabasca province was being actively mountain built from 1860 to 1630 million years ago, but not subsequently. It is suggested that the many younger ages determined for the pitchblende deposits in that region are correct and indicate solution and redeposition of the deposits at a later time.


ISSN: 1050-9747
Coden: BUGMAF
Serial Title: Bulletin of the Geological Society of America
Serial Volume: 65
Serial Issue: 1
Title: Isotopic constitution of radiogenic leads and the measurement of geological time
Pages: 1-21
Published: 195401
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
Accession Number: 1959-046759
Categories: Geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
N42°00'00" - N84°00'00", W141°00'00" - W52°00'00"
N43°00'00" - N79°00'00", W124°00'00" - W56°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. 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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