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No, not really. In simple terms, to be soluble in water, Pb must be in contact with it. But most of Pb is stored within the Zircon lattice, where water cannot diffuse through. For example, many zircons in metamorphic and magmatic-hydrothermal settings experience supercritical fluids, but preserve their U/Pb ratios (e.g. inherited cores in metasedimentary ...

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