It belong series of the alkaline basalt, and have character of island ocean in geochemistry and petrochemistry.
岩石化学、球化学特征表明，该组火山岩属碱性玄武岩系列大西洋型(质类型)具洋岛特征。
The oceanic island basalt is represented by the Nonghuai pillow lava, which is, originally Hawaii type one in the Paleotethyan ocean, an allochthon in the Indosinian foreland fold and thrust belt.
洋岛玄武岩以弄槐枕状熔岩为代表性火山岩，原为古特提斯洋盆中的夏威夷型洋岛，现保存在印支期前陆褶皱冲断带的一个外来岩席中。
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