Synthetic U-Pb ‘standard’ solutions for ID-TIMS geochronology [abstract only]
- Condon, Daniel
- Mclean, Noah
- Schoene, Blair
- Bowring, Sam
- Parrish, Randall
- Noble, Stephen
DOIAbstract
Isotope Dilution-Thermal Ionisation Mass Spectrometry (ID-TIMS) U-Pb geochronology affords the opportunity to determine 206Pb/238U dates with unprecedented precision - often <1‰ on single analyses or weighted mean dates derived from multiple analyses. The accuracy of these dates is dominated by (1) the U/Pb tracer calibration; (2) massspectrometry, (3) various corrections applied (such as those for U oxide), and (4) ‘constants’ used in the age calculation (decay constants and the 235U/238U value of natural U). Some of these parameters can be considered as ‘systematic’ (i.e., decay constant uncertainties) and others either contain a random component (not accounted for by counting statistics) or are systematic but ‘laboratory’ specific. ...
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