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地球学报  2004 

含澄江动物群地层的Pb-Pb同位素定年

Keywords: 澄江动物群,铅同位素,定年

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Abstract:

对含澄江动物群的地层样品进行了Pb同位素定年研究。经测定未受风化作用影响的20个黑色页岩样品给出了534±60Ma左右的PbPb等时线年龄,应代表了澄江动物群的下限年龄。该年龄较以往采用RbSr和40Ar39Ar等定年方法所获得的年龄更为年轻。

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