| Title | Analytical techniques for the determination of 208Pb/232Th ages of monazite and zircon at the Geochronlogy Laboratory, Geological Survey of Canada |
| Download | Download (whole publication) |
| |
| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Davis, W J ;
Parrish, R R; McNicoll, V; Bellerive, D |
| Source | Radiogenic age and isotopic studies: Report 11; by Geological Survey of Canada; Geological Survey of Canada, Current Research no. 1998-F, 1998 p. 19-22, https://doi.org/10.4095/210052  Open Access |
| Year | 1998 |
| Publisher | Natural Resources Canada |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| Related | This publication is contained in Radiogenic age and isotopic
studies: Report 11 |
| File format | pdf |
| Subjects | geochronology; analytical methods; thorium lead dates; zircon dates; radiometric dates |
| Illustrations | analyses |
| Released | 1998 12 01 |
| Abstract | A 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). |
| GEOSCAN ID | 210052 |
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