根据地质、地球化学和Nd同位素研究 ,华北克拉通及邻区孔兹岩系主要形成于古元古代。笔者对孔兹岩系变泥沙质岩石进行了地球化学统计性研究。它们普遍高K2 O低Na2 O ,具有重稀土部分呈平坦型 ,轻重稀土分离较弱 ,存在较强负铕异常的稀土模式。在岩石/MORB -元素图解上 ,除Nb、P、Ti相对亏损外 ,还存在明显的负钡异常。具高成熟度的泥沙质岩石tDM和ΣNd( 2 .3Ga)变化范围分别为 2 .30～ 3.2 4Ga和 - 4 .77± 5.11。孔兹岩系形成于太古宙之后 ,与其主体由泥沙质岩石组成 ,并且需要有一个广泛出露、高成熟度陆壳基底物源区的认识相吻合。在考虑泥沙质岩石组成受源区组成和作用过程双重制约的情况下 ,给出了华北克拉通太古宙基底组成的估计值。它们与Taylor等 ( 1985)给出的太古宙上部地壳组成估计值存在较大区别 According to the geology, geochemistry and Nd isotopic studies, the Khondzian rocks in the North China Craton and its adjacent areas are mainly formed in the Paleoproterozoic. The authors conducted a geochemical statistical study of the khonzei-type silty rocks. They are generally high K2 O low Na2 O, with heavy rare earth part of the flat type, light and heavy rare earth separation is weak, there is a strong negative Eu anomaly rare earth pattern. On the rock / MORB - elemental diagram, except for the relative depletion of Nb, P and Ti, there is also obvious negative barium anomaly. The ranges of tDM and ΣNd (2.Ga) with high maturity are 2.30 ~ 3.2 4Ga and -4.77 ± 5.11, respectively. The Khondz Formation formed after Archean coincides with the understanding that the main body is composed of sedimentary rocks and that there is a broadly exposed and highly matured source base of continental basements. Considering the dual constraints of the composition and process of the source rocks of the sedimentary rocks, the estimated values ​​of the basement composition of the Arctic Craton in North China are given. They differ greatly from the estimated Archean upper crustal composition given by Taylor et al. (1985)