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| Chemale Jr,Farid; Kawashita,Koji; Dussin,Ivo A.; Ávila,Janaína N.; Justino,Dayvisson; Bertotti,Anelise. |
| The LA-MC-ICP-MS method applied to U-Pb in situ dating is still rapidly evolving due to improvements in both lasers and ICP-MS. To test the validity and reproducibility of the method, 5 different zircon samples, including the standard Temora-2, ranging in age between 2.2 Ga and 246 Ma, were dated using both LA-MC-ICP-MS and SHRIMP. The selected zircons were dated by SHRIMP and, after gentle polishing, the laser spot was driven to the same site or on the same zircon phase with a 213 nm laser microprobe coupled to a multi-collector mixed system. The data were collected with a routine spot size of 25 μm and, in some cases, of 15 and 40 μm. A careful cross-calibration using a diluted U-Th-Pb solution to calculate the Faraday reading to counting rate conversion... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: MC-ICP-MS; SHRIMP; Faraday cups; Multi-ion Counting System; U-Pb in situ zircon dating. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200005 |
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