【摘要】 针对目前关于东秦岭造山带中陡岭块体在构造归属上尚存在的不同意见，对该块体中的陡岭群黑云母斜长片麻岩、斜长角闪岩和侵入于该群中的新元古代花岗岩类长石Ｐｂ同位素组成特征进行了分析，并与北秦岭块体中的秦岭群变质杂岩和侵入于秦岭群中的新元古代花岗岩类长石Ｐｂ同位素组成特征进行了综合对比．研究表明，陡岭块体以低放射成因Ｐｂ同位素组成为特征，而秦岭群变质杂岩和其中的新元古代花岗岩类则以高放射成因Ｐｂ同位素组成为特征，两者在Ｐｂ同位素组成特征上存在着很大的差异，由此否定了陡岭群变质杂岩来自于秦岭群分离的一个岩块的认识．在构造归属上，陡岭群应是南秦岭内部的一个块体更多还原

【Abstract】 The analys is ismade of Pb isotopic compositions of the Douling Group biotite-plagioclase gneiss,plagioclase amphibolites and granites from the Douling massif.The Pb isotopic comparison is made between the Douling massif and North Qinling massif in metamorphic rocks and associated granites.The results indicate that the Douling massif is characterized by low radiogenic Pb isotopic composition,whereas the North Qinling massif is characterized by high radiogenic Pb isotopic composition.The Pb isotopic compositional differences between the twom assifs are prominent,suggesting that the Douling massif may not been separated from the North Qinling massif.Instead,it would have been a massif within South Qinling.更多还原