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TitleLong-term reproducibility of 207Pb/206Pb age at the GSC SHRIMP lab based on the GSC Archean reference zircon z1242
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorDavis, W JORCID logo; Pestaj, T; Rayner, NORCID logo; McNicoll, V M
SourceGeological Survey of Canada, Scientific Presentation 111, 2019, 1 sheet, Open Access logo Open Access
PublisherNatural Resources Canada
Meeting9th International SHRIMP Workshop; Ochang and Gyeongju; KO; September 2018
Mediaon-line; digital
File formatpdf (Adobe® Reader®)
ProvinceQuebec; Ontario
NTS32D; 42A/01; 42A/08; 42A/09; 42A/16
Lat/Long WENS -80.5000 -78.0000 49.0000 48.0000
Subjectsgeochronology; Science and Technology; radiometric dating; lead lead dates; uranium lead dates; lead uranium ratios; lead isotope ratios; zircon dates; mass spectrometer analysis; analytical methods; Archean; Lac Frechette Pluton; Pontiac Subprovince; Superior Province; Neoarchean; Laboratories; Precambrian
Illustrationsgeoscientific sketch maps; plots; bar graphs; photomicrographs; Concordia diagrams; time series
ProgramScience laboratory network
Released2019 12 19
Summary(Plain Language Summary, not published)
This poster describes quality control/quality assurance protocol for Pb/Pb geochronology data in the Geological Survey of Canada's (GSC) SHRIMP lab. Reference zircon z1242 has been routinely analysed by the GSC's geochronology laboratories. The zircon is from the Lac Frechette pluton in the Superior Province, Canada. Over 50 high precision ID-TIMS analyses have been on zircon z1242 made yielding an average 207Pb/206Pb age of 2679.8 +/- 0.19 Ma. Zircon z1242 is also analysed as an 'unknown' as part of each SHRIMP analytical session where in most cases the value determined is within error of the TIMS accepted value. If required an instrumental mass fractionation factor may be applied to the data set based on the measured 207Pb/206Pb ratio.

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