常量元素、微量元素、稀土元素、Ｎｄ同位素及氧同位素地球化学特征表明，大别山北部变质镁铁－超镁铁质岩带中存在变质的蛇绿岩，它主要由变质橄榄岩、辉长岩（－辉绿岩？）和基性熔岩三部分组成。其中，变质的基性熔岩的亏损地幔模式年龄ｔＤＭ／Ｍａ＝１０３６．８～１２９３．８，εＮｄ（ｔ）＝７．２～７．７，表明它可能代表１０００Ｍａ左右形成于中等扩张速率（２ｃｍ／ａ左右）洋盆条件下的洋壳残片。 The geochemical characteristics of the major elements, trace elements, rare earth elements, Nd isotopes and oxygen isotopes indicate that metamorphic ophiolite is present in the metamorphic mafic-ultramafic rocks in the northern part of the Dabie Mountains. It is composed of metamorphic peridotites, gabbro - diabase?) And basic lava in three parts. Among them, the depleted mantle model ages of metamorphic basic lavas are tDM / Ma = 1036.8-1293.8 and εNd (t) = 7.2-7.7, indicating that it may represent about 1000Ma formed at moderate expansion rate (2cm / A or so) oceanic shell fragments under ocean conditions.