通过研究南秦岭地区陡岭群、武当群和北秦岭地区秦岭群的变质基性岩等的铅同位素和微量元素组成，揭示出东秦岭造山带分布有两种性质及不同归属的元古宙地壳，指出中、古元古代时可能不存在一个统一的地壳基底；南秦岭的中、古元古代地壳是在扬子陆块基底上通过岛弧的侧向加积形成的，北秦岭元古宙地壳则可能垂向增生于一个富放射性成因铅同位素组成的、具古洋壳幔性质的微地块之上．研究还表明陡岭群不是北秦岭地区的秦岭群，而应属于南秦岭地壳的组成部分 By studying the Pb isotopic composition and trace element composition of metamorphic basic rocks such as the Doutling Group, Wudang Group and Qinling Group in the South Qinling Mountains, it is revealed that there are two types of metamorphic crusts in the East Qinling orogenic belt It is pointed out that there may not exist a unified crustal basement during the Middle and Ancient Paleosols. The Middle and Early Paleoproterozoic crust in the South Qinling Mountains was formed by the lateral accretion of the island arc on the basement of the Yangtze block. The Proterozoic crust It may vertically accrete above a micro-massif of paleo-crust with a rich radiogenic lead isotope. The study also shows that the Stepping Ridge Group is not part of the Qinling Group in the North Qinling Mountains but belongs to the component of the South Qinling Crust