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古田—溪尾地区碎斑熔岩体的形成受北东向基底断裂带控制,具明显水平和垂直分带。由中心到边缘可划分出中酸性、酸性粒状碎斑熔岩,霏细状、隐晶状碎斑熔岩等4种岩石类型,是晚侏罗世火山活动衰亡和火山机构塌陷时期岩浆侵出—溢流相的产物。碎斑熔岩与同期潜花岗斑岩、流纹质晶屑凝灰岩是同源岩浆分异及演化的结果,在空间上构成三相一体的共生组合体。
The formation of crustal lava bodies in the Gutian-Xitao area is controlled by the NE-trending basement fault zone, with obvious horizontal and vertical zonation. From the center to the edge, four types of rocks are classified as moderately acidic, acid granular cricket lava, fine fossil, cryptocrystalline lava and other lava. These are the decline of volcanic activity of late Jurassic and the magma invasion during volcanic collapse The product of the flow. The crustal lava and contemporaneous subduction porphyry and rhyolite crystal tuff are the result of the differentiation and evolution of the same magma, forming a symbiotic assemblage of three phases in space.