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We present zircon ages and Hf-in-zircon isotopic data for plutonic rocks and review the evolution of central Inner Mongolia, China, in the early and late Paleozoic. Zircons of a granodiorite yielded a 206Pb/238U age of 472±3Ma that reflects the time of early Paleozoic magmatism. Zircon ages were also obtained for a tonalite (329±3Ma), quartz-diorite (320±3Ma), and granite vein (297±2Ma). Our results,...
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