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About 195Ma ago , with powerful volcanic erupting and magma intruding , Nianbaoyuze granite mass was formed and whose bulk was 820km2.

距今 1.95亿年前后，伴随山崩地裂的火山喷发和岩浆侵入，造就了规模达 820km2 的年保玉则花岗岩体。

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