茅山东部地区第三纪两期玄武岩 ,在岩石地层上命名为凉帽顶火山岩锥、方山火山岩锥 ,分别隶属于渐新世三垛组和中—上新世雨花台组 ,相当于两个火山旋回 ,在岩石学、岩石化学、地球化学上有一定的演化规律。两期玄武岩均属钠质碱性玄武岩系列、B类岩浆 ,原始岩浆来源于深部上地幔 The tertiary basaltic and basaltic basalts in the eastern part of Maoshan are named as the capped volcanic cone and the Fangshan volcanic cone on the lithostratigraphy, belonging to the Oligocene Nandu Formation and the Meso-Pliocene Yuhuatai Formation respectively, corresponding to two volcanic cycles , In petrology, petrochemistry, geochemistry, there is a certain law of evolution. Both of the two basalts belong to the series of sodium basalt basalt and B magma. The primitive magma comes from the deep upper mantle