中文摘要：

通过对周口店岩体地球化学特征和构造环境及其与埃达克岩对比的分析，发现该岩体具有C型埃达克岩的地球化学特征。^143Nd／^144Nd-^87Sr／^86Sr图解发现该岩体的锶、钕同位素投影点均落在EMI型富集地幔区域内，表明其物质来源与EMI型富集地幔有关。而εNd（t）-ISr图解中，其投影点正好落在汉诺坝二辉麻粒岩包体范围内（汉诺坝二辉麻粒岩包体是幔源基性岩浆在晚古生代-中生代底侵到下地壳底部构成的年轻下地壳的一部分）。由此推测认为，周口店岩体是中生代新增生的华北克拉通下地壳的部分熔融的产物。

英文摘要：

Based on geochemical characteristics and tectonic setting of intrusive rocks in Zhoukoudian complex and a comparison with adakites, the authors have revealed that these intrusive rocks are similar to adakites in petrological and geochemical characteristics. ^143Nd/^144Nd-^87Sr/^86Sr diagram shows that the projections are in the EM I -rich mantle region, suggesting that their material sources are related to EM I irich mantle. Besides, εNd（ t ）- ISr figure proves that the projections are within granulites and pyroxenite xenoliths in Hannuoba basalts. Further research indicates that Zhoukoudian complex was formed by partial melting of young lower crust in the North China craton in Mesozoic.