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.
三塘湖地区早石炭世火
活动强烈，发育以
主的
武、、英流纹的石组合。
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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的石，
如中性到
质的火——
玄武，则会形成颜色更深、富含的粉，这类粉吸收更多光线，从而使湖泊看起来偏绿、偏灰，或是较为暗淡的蓝色，具体取决于粉的浓度。
