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(2020) SHRIMP U-Pb Zircon Geochronology of Volcanic Rocks Hosting World-Class Be-U-Li-F Mineralization, Spor Mountain, Utah, U.S.A

Ayuso R, Foley N & Vazquez J


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08i: Plenary Hall, Friday 26th June 22:03 - 22:06

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Submitted by Kathryn Goodenough on Friday 26th June 11:32
Great poster, thankyou! I am intrigued by the fact that you can recognise younger hydrothermally altered zircons and that they have different REE patterns to the magmatic zircons - do you think there has been leaching of REE from zircon during alteration by F-rich fluids?

Submitted by Nora Foley on Friday 26th June 21:39
Hi Kathryn, Yes, the petrography of the younger zircon population contrasts with the “coherent” older zircon population (whose SHRIMP spot ages are interpreted as the age of crystallization) in many ways summarized in our paper (Ayuso et al., 2020). Some of these features include reacted rims (and internal zircon fractures), increased abundance of inclusions, larger dusty patches, etc. Specifically related to the identification of hydrothermally affected zircons is the resulting REE patterns. We are convinced that a significant effect of this alteration is that certain REE elements were removed/remobilized. The result is that the zircons affected this way display “V-shaped” REE patterns. Also, hydrothermally affected zircons in some instances show good correlations between the U-Pb dates and total U (this is not evident in the older zircon population). We think that reflects addition of F and U during the hydrothermal alteration.

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