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TitleAnalytical techniques for the determination of 208Pb/232Th ages of monazite and zircon at the Geochronlogy Laboratory, Geological Survey of Canada
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LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorDavis, W JORCID logo; Parrish, R R; McNicoll, V; Bellerive, D
SourceRadiogenic age and isotopic studies: Report 11; by Geological Survey of Canada; Geological Survey of Canada, Current Research no. 1998-F, 1998 p. 19-22, Open Access logo Open Access
PublisherNatural Resources Canada
Mediapaper; on-line; digital
RelatedThis publication is contained in Radiogenic age and isotopic studies: Report 11
File formatpdf
Subjectsgeochronology; analytical methods; thorium lead dates; zircon dates; radiometric dates
Released1998 12 01
AbstractA mixed 230Th-233U-235U-205Pb isotopic spike has been prepared for the analyses of thorium, uranium, and lead isotopes by isotope-dilution methods, and the determination of 208Pb/232Th, 207Pb/235U, and 206Pb/238U mineral ages. The chemical separation procedure uses Dowex (1X8)TM anion exchange resin to separate Th from Pb and U, and a separate column containing TEVA-SPECTM anion exchange resin to further purify Th. Thorium isotopes are analyzed either in static multicollector mode, or by single, secondary electron multiplier on a Finnigan-Mat 261 mass spectrometer. Analyses of high-optical-quality, concordant or near concordant (<±0.5%) monazites from 12 Paleoproterozoic and Neoarchean rocks show good agreement between 208Pb/232Th and 206Pb/238U ages (average <0.1% relative difference).

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