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
强烈，发育以安岩类为主的
武岩、安岩、英安流纹岩的岩
。
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Whereas those with lower silica content, like intermediate to mafic volcanic andesite and basalt, tend to make darker iron and magnesium-rich flour, which absorbs more light, making lakes that look greener, grayish, or duller blue, depending on concentration.
而二氧化硅含量较低
岩石，
如中性到镁铁质火山岩——安山岩和玄武岩，则会
色更深、富含铁和镁岩粉，这类岩粉吸收更多光线，从而使湖泊看起来偏绿、偏灰，或是较为暗淡蓝色，具体取决于岩粉浓度。
