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大别山北缘安徽响洪甸碱性杂岩体由正长岩、碱性正长岩及霞石正长岩组成,而霞石正长岩则以团块状、不规则状、透镜状及似层状形式存在于碱性正长岩之中。已有的资料虽然较为全面,但年代学测定所用的方法较为单一,而精确的年龄是讨论杂岩体成因及霞石正长岩与碱性正长岩之间关系的先决条件。
The northern part of the Dabie Mountains is composed of anorthogenite, alkaline syenite and nepheline syenite, while the nepheline syenite is composed of massive, irregular, lenticular and lenticular Layered forms exist in alkaline syenite. Although the available data are relatively comprehensive, the methods used in geochronology are relatively simple. Precise ages are the prerequisites for discussing the genesis of complex bodies and the relationship between nepheline syenite and alkaline syenite.