滇东南建水地区二叠纪火山岩构造侵位于师宗-弥勒断裂带的西南段，以玄武岩、玄武安山岩和安山岩为主，夹有少量苦橄岩。地质、地球化学特征显示其形成于弧后盆地环境，与建水地区石炭纪枕状熔岩相配套。显示扬子陆块和华夏陆块在晚古生代发生了板块俯冲，形成岛弧火山岩，二叠纪时产生弧后引张，形成弧后盆地。从晚古生代-早中生代，扬子陆块和华夏陆块之间可能存在一个复杂的沟弧盆体系。

The Permian volcanic rocks from jianshui area tectonically intrude into southwest part of Shizong-Mile fault belt. It is mainly comprised of basalts、basaltic andesites、andesites and a little picrites. Geological and geochemical characteristics show that they are formed in back-arc environment, matching with Carboniferous pillow lava from Jianshui area. These imply that Yangtze block and Cathaysia block occur plate-subduction in late Paleozoic forming the island-arc volcanic rocks, and that they produce back-arc extension in Permian, then form back-arc basin. From late Paleozoic to early Mesozoic, there is a complex trench-arc-basin system between Yangtze and Cathaysia blocks.