对华北旱第三纪火山岩（由K-Ar年龄确定）进行了系统的主元素、微量元素和Sr,Nd,Ph同位素分析.这些资料显示,早第三纪火山岩主要是钙碱质的,其次是碱质的,并且与晚第三纪和第四纪火山岩在地球化学上有明显差异.特别是,华北南部的早第三纪人山岩来源于富集的岩石圈地幔（EMⅡ）,这一富集地幔可能是印支期扬子大陆向华北大陆俯冲形成的地幔楔的残留. The main elements, trace elements and Sr, Nd and Ph isotopes of the system were determined for the northern Tertiary volcanic rocks (determined by the age of K-Ar). These data show that the Early Tertiary volcanic rocks were mainly calc-alkaline, followed by Is alkaline and is significantly geochemically distinct from the Late Tertiary and Quaternary volcanic rocks, especially since the Early Tertiary pendulum from southern North China originated from enriched lithospheric mantle (EM II) An enriched mantle may be the remnant of the mantle wedge formed during the Indosinian Yangtze subduction to the North China continent.