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Laser ablation microprobe-inductively plasma-mass spectrometry (LAM-ICP-MS) with a frequency quadrupled Nd-YAG UV laser (266 nm) has been used as a fast and relatively low cost technique to successfully determine the 207 Pb/ 206 Pb age of single zircon grains with ages older than 1000 Ma; however, it has a problem with serious fractionation in Pb/U during the ablation...
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