大别山北部变质镁铁一超镁铁质岩带中斜长角门岩类的常量、微量和稀土元素地球化学特征均表明，它们可划分为二类：Ⅰ类为洋岛型拉班玄武岩；Ⅱ类为岛弧型玄武岩且其中大多数属钙碱性玄武质安山岩和少数属拉班玄武岩。其中，前者Ti、Nb、Cr等元素富集，且Nb／Th＝11、Zr／Nb＝9．6和Hf／Ta＝2．9～11；后者以Ti、Nb、P、Hf等元素亏损和Sr、K、Rb、Ba、Th等元素富集为特征，且Nb／Th＝2．3和Zr／Nb＝23．1。它们可能分别属于洋岛型和岛弧型蛇绿岩中成员。 The constants, trace elements and geochemical characteristics of REE in the metamorphic mafic-ultramafic rocks in the northern part of the Dabie Mountains indicate that they can be divided into two types: Ⅰ is the Yangba-type Laban basalt; and Ⅱ It is island arc basalts and most of them are calc-basaltic andesite and a few belong to Laban basalts. Among them, the former elements such as Ti, Nb and Cr are enriched, and Nb / Th = 11, Zr / Nb = 9.6 and Hf / Ta = 2.9 to 11; Depletion and enrichment of Sr, K, Rb, Ba, Th and other elements, and Nb / Th = 2.3 and Zr / Nb = 23.1. They may belong to members of the oceanic and island arc type ophiolite respectively.