The use of multiple reference samples for the monitoring of ion microprobe performance during zircon 207 Pb/ 206 Pb age determinations
Data from a series of extended analytical sessions using a range of different zircon reference samples have been used to investigate the periodic derivation of abnormal 207Pb/206Pb ages during microbeam analysis. For the Canberra SHRIMP II, this phenomenon probably results from the presence of a signal at mass 204 that is alien to the Pb spectrum; isotopic fractionation is unlikely to be a significant contributor. In contrast, abnormal 207Pb/206Pb ages obtained from SHRIMP I at the same...[Show more]
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|Source:||Geostandards Newsletter - The Journal of Geostandards and Geoanalysis|
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