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Alkaline meta-granitoids, ranging in composition from syenite to alkali granite, occur in the northwestern Gyeonggi massif. Ion microprobe U-Pb zircon analyses indicate that the granitoids were emplaced at 742+/-13Ma, and are corroborated by a Rb-Sr whole rock age of 770+/-40Ma. Major and trace element characteristics, together with Sr and Nd isotopic data, suggest that the granitoid magma was derived...
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