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I have zircons that have been mounted in a resin block. They have been polished to approximately half way through the zircons (as is convention) and they have been ablated to attain the U-Pb or Pb-Pb ages. I am unfamiliar with the intricacies of the (U+Th)/He method. Can these zircons still be analysed for (U+Th)/He? Or would the ablation affect the results? Furthermore, would the zircons need to be extracted from the resin blocks? If so, what would be the best method of extraction?

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  • $\begingroup$ (U+Th)/He is going to be by solution, no by LA, am I right? $\endgroup$ – Gimelist Jun 10 '16 at 8:50
  • $\begingroup$ That's right. So the problem would be getting the zircons out. I don't know if there are people out there that have done this kind of thing. And again, I don't know if the ablation process may affect the results for (U+Th)/He $\endgroup$ – Ton Jun 10 '16 at 13:35
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    $\begingroup$ I would suspect that the isotope ratios my be disrupted at the ablation wall holes. Maybe leaching that stuff somehow to leave only pristine zircon? No idea. I would do a literature search to see if someone has done it before. Look at their methods section, and possibly email the corresponding author. $\endgroup$ – Gimelist Jun 10 '16 at 21:28

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