Opal as a U-Pb geochronometer: Search for a standard
We report structural, geochemical, and TIMS U-Th-Pb and U-series isotopic data for several samples of precious and common opal, which we tested as potential standards for ion microprobe and LA-ICPMS isotopic studies. The precious opals are low in U, contain high concentration of common Pb, and are not suitable for U-Pb age determinations. In contrast, all studied samples of common opal are enriched in uranium and contain sufficiently radiogenic Pb for precise calculations of206Pb/238U...[Show more]
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