安徽北淮阳构造带的基底由一套变火山沉积岩建造 (即原称庐镇关群 )所组成。岩类学、岩石地球化学、年代学的研究表明 ,这套火山岩属碱性玄武岩系列、拉斑玄武岩系列和钙碱性玄武岩系列 ,分别形成于中元古宙陆内裂解 (扩张 )带和晚元古宙岛弧两种构造环境 ,其中以岛弧环境火山岩为主要部分 ,由此可以证明北淮阳构造带是在中元古宙陆内裂解带基础上发展起来的古弧系 ,具有大陆型基底性质 The basement of the northern Huaiyang tectonic belt in Anhui consists of a volcanic sedimentary rock (formerly known as Lu Guan Zhenqun). The study of petrography, lithochemistry and geochronology shows that this series of volcanic rocks are alkaline basalt series, tholeiite series and calcareous basaltic series, respectively formed in the Proterozoic intracontinental pyrolysis (expansion) zone and late Archean arc island two kinds of tectonic environment, in which the island arc environmental volcanic rock as the main part, which can prove that the Northern Huaiyang tectonic belt is in the Proterozoic intracontinental pyrolysis zone developed on the basis of the ancient arc system, with the mainland Type substrate properties