摘要
北京西山早侏罗世南大岭组玄武岩富集Ｂａ、Ｚｒ、Ｐ和轻稀土元素，亏损Ｔｉ、Ｈｆ、Ｒｂ、Ｙｂ等。其微量元素含量及配分与大陆碱性玄武岩相似．南大岭组玄武岩起源于富集型地幔的部分熔融，原始岩浆经历了随机ＲＴＦ（周期性补充、排出和分离）过程的演化，在演化过程中岩浆未受地壳物质的同化混染。
The basalts of the Early Jurassic Nandaling Formation, in the Western Hills of Beijing, have the characteristics of enrichment of Ba, Zr, P and LREE, deficit of Ti, Hf, Rb and Yb etc. The contents and distribution of trace elements are similar to the Continental Akaline Basalt. The Nandaling basalts were originated by partial melting of a fertile mantle. The primary magma evolved in a Randomized RTF (periodic Replenishment, Tapping and Fractionation) Chamber. No assimilation and contamination of the crust material had happened during the evolution of the basaltic magma.
出处
《北京地质》
1994年第4期16-24,共9页
Beijing Geology
关键词
玄武岩
微量元素
早侏罗世
Western Hills of Beijing, Nandaling Formation, basalt, trace element.
