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Zircon U-Pb dating of early Paleozoic granitoids in North Qinling yields three age peaks of ∼500, ∼452 and ∼420 Ma. They can be temporally correlated with high-pressure to ultrahigh-pressure metamorphism at ca. 500 Ma, retrograde granulite-facies metamorphisms at ca. 450 Ma and amphibolite-facies metamorphism at ca. 420 Ma, respectively. The first episode of granitic magmatism is considered to have...
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