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 The base age of the Changchengian System at the northern North China Craton should be younger than 1670 Ma: Constraints from zircon UPb LAMCICPMS dating of a graniteporphyry dike in Miyun County, Beijing.
李怀坤，苏文博，周红英，耿建珍，相振群，崔玉荣，刘文灿，陆松年
Earth Science Frontiers . 2011, (3): 108 -120 . 

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