This type of graphite deposits were formend in the Late Archaean to Early Proterozoic.

鲁西晚太古代的侵入岩属无铕异常型，早元古代的侵入岩为负铕异常型；

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This type of graphite deposits were formend in the Late Archaean to Early Proterozoic.

鲁西晚太古代的侵入岩属无铕异常型，早元古代的侵入岩为负铕异常型；

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