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地质学报  2005 

阜平岩群下部Sm―Nd同位素年龄及其地质意义

, PP. 784-789

Keywords: 阜平岩群,Sm-Nd同位素年龄,含辉石斜长角闪岩,深变质绿岩带

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Abstract:

阜平岩群主要分布在太行山北段,是我国太古宙重要的地层单元,并构成阜平深变质绿岩带的岩石组合。前人认为阜平岩群及其区域变质时代主要为新太古代。本次对阜平岩群下部含辉石斜长角闪岩Sm-Nd同位素年代学的详细研究,获得Sm-Nd等时线年龄3352±50Ma和平均模式年龄3374.5Ma,说明阜平岩群底界年龄接近3400Ma,从而也反映阜平深变质绿岩带形成在古―中太古代,是我国目前最老的绿岩带,也是世界上最古老的绿岩带之一。

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