Globally, >2.7 Ga zircons primarily display mantle-like or slightly elevated δ 18 O values, whereas those with ages <2.7 Ga show an increasing trend in δ 18 O values (Fig. 2f ), as similarly demonstrated in previous analyses 41 .
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Archaean multi-stage magmatic underplating drove formation of continental nuclei in the North China Craton.
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