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.

三塘湖地区早炭世火山活动强烈，发育以安山岩类玄武岩、安山岩、英安流纹岩岩。

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.

摘要通过大比例尺平面地质续图、剖面测量和显微构分析，九台营城煤矿区流纹岩中泡构造发育。