Volcanicity was violent during the Early Carboniferous in Santanghu region.The volcanic rocks consist of basalts,andesites and dacite liparite,with andesites playing the main part.

三塘湖区早石炭世火山烈，发育以安山岩类为主的玄武岩、安山岩、英安流纹岩的岩石组合。

Large scale planar geological mapping, profiling survey and microfabric analyses proved that lithophysa structure was developed in rhyolite in Yingcheng coal mine area, Jiutai City.

摘要通过大比例尺质续图、剖测量和显微组构分析，九台营城煤矿区流纹岩中石泡构造发育。