赣东北张村岩群所含之中基性变火山岩的地球化学研究表明 :其主元素具低钾高钠 ;稀土元素具Eu亏损 ,Pr、Tb、Tm富集 ;微量元素具Rb、Zr、Ce微弱亏损 ,部分样品Ta富集 ,其总体特征类似于岛弧拉斑玄武岩 ,显示其形成于大洋岛弧构造环境 The geochemical study of the mid-base volcanic rocks in Changcun Group in the northeastern Jiangxi Province shows that the major elements are low potassium and high sodium; the rare earth elements are depleted in Eu and enriched in Pr, Tb and Tm; the trace elements include Rb, Zr, Ce is weakly depleted and part of the sample is enriched in Ta. Its general characteristics are similar to island arc tholeiitic basalts, indicating that it formed in the oceanic arc tectonic setting