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Geochemical discrimination diagrams for zircons. (a) Hf versus U/Yb diagram after38; (b) Y versus U/Yb diagram after38; (c) Th/U versus Nb/Hf diagram after39; (d) Th/Nb versus Hf/Th diagram after39; (e) U versus Y diagram after40; (f) Ta versus Nb diagram after40.
