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.

三塘湖地区早石山活动强烈，发育以安山岩类为主的玄武岩、安山岩、英安流纹岩的岩石合。

Perlite, obsidian and pitchstone are volcanic glass having the same compositions commonly with rhyolite as well as andesite and basalt.

珍珠岩、黑耀岩和松脂岩等玻璃质熔岩以酸性为主，中基性者也见。

The first rock is mainly andesite clinkering agglomerate, andesite breccia, dacite breccia, rhyolite breccia and rhyolite clinkering tuff.

山碎屑岩亚类岩石类型主要为安山质熔结集块岩,安山质、英安质及流纹质山角砾岩以及流纹质熔结凝灰岩。

The extrusive rock unit includes basalt, andesite, boninite and albitite as well as breccia and tuff.

喷出岩单元不仅仅由玄武岩成，还包括安山岩、玻安岩、钠长岩以及角砾岩、凝灰岩等。