LA-ICP-MS U-Pb dating

Storey, C.D., Smith, M.P., and Jeffries, T.E. (2007) In situ LA-ICP-MS U-Pb dating of metavolcanics of Norrbotten, Sweden records of extended geological histories in complex titanite grains. Chem. Geol, 240 (1-2), 163-181. 

The Sm-Nd data were used to create an isochron, which was used to derive and age (Fig. 1). The calculated age, 369 19 Ma, is in excellent agreement with the known age of the complex, 368 4 Ma (Parrish et al. 1987). This age is also consistent with our preliminary LA-ICP-MS zircon U-Pb dating of dykes in the SM and the NS-N groups. 

LA-ICP-MS using a multi-collector instrument for Pb-Pb dating via ° Pb/ °" Pb and ° Pb/ ° Pb isotope ratio measurements of natural rutile crystals has been utilized to study geological temperature-time histories. The significance of Devonian-Carboniferous igneous activity in Tasmania on the basis of U-Pb dating has been measured by sensitive high resolution ion microprobe (SHRIMP). ... 

FRONTIER IN U-PB DATING AGE DETERMINATION IN QUATERNARY ZIRCON USING LA-MC-ICP-MS... 

Frei, D. and Gerdes, A. (2009) Precise and accurate in situ U-Pb dating of zircon with high sample throughput by automated LA-SF-ICP-MS. Chem. CeoL, 261, 261-270. 

These measurements on solutions will fix the best precision that cannot at present be exceeded using a laser for sample introduction in the MC-ICP-MS. After preliminary remarks about the U-Pb system in a zircon mineral phase, the first section describes the method to achieve convenient preparation of the samples. In the second section, the laser conditions to achieve isotope measurements on zircon are listed, and some reference zircon samples, already dated by using other techniques, are dated to check the precision and accuracy of the LA-MC-ICP-MS protocol. Finally, an example of an investigation of very young zircons, which are the most difficult samples because they contain very little amounts of radiogenic Pb, is discussed. 

Bouman, C., Cocherie, A., Robert, M., Schwieters, J.B., Wiser, M. (2003) In situ U-Pb zircon dating using laser ablation multi ion counting ICP-MS (LA-MIC-ICPMS). Thirteenth Annual Goldschmidt Conference, September 7-12,2003, Kurashiki, Japan. 

Baddeleyite (Zr02) occurs in silica-poor rocks in which zircon may be absent. It generally has low common Pb and high U contents and is therefore very well suited to dating. It may be the one mineral for which external standardization with zircon could work, considering that zircon itself breaks down to baddeleyite with most commonly used lasers [40]. It has been analyzed by LA-Q-ICP-MS with zircon standardization [83], giving an Pb/ Pb age indistinguishable from that for zircons from the same mafic dyke sample (1353 + 14 versus 1345 + 12 Ma). 

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