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隆回县枫溪江地区的板溪群马底驿组,主要由绿片岩相的千枚岩、变质砂岩、大理岩和变质火山岩组成。可分四个岩性段。第二岩性段下部由火山熔岩—火山角砾岩—正常沉积岩的韵律沉积而成。根据变质火山岩的产状、岩石的结构、构造和化学成分特征,笔者认为是一套由次火山相的辉绿岩、喷溢相的玄武岩和喷发相的安山质火山角砾岩组成的海底火山岩系,它们同属来自上地幔的拉斑玄武岩浆的分异产物。
The Maxianye Formation of Banxi Group in the Fengxi River area of Longhui County consists mainly of phyllites, metamorphic sandstones, marble and metamorphic volcanic rocks of the greenschist facies. Divided into four lithological segments. The lower part of the Second Lithosphere is formed by the rhythmic deposition of volcanic lava-volcanic breccia-normal sedimentary rocks. According to the occurrence of metamorphic volcanic rocks, the structure, structure and chemical composition of rocks, the authors consider a seabed composed of subglacial diabase, basalt of effusive facies and andesitic volcanic breccia of the eruption phase Volcanic rocks, which belong to the same product from the upper mantle of tholeigenic basalt magma.