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威信县位于云南省东北角,北东两面分别与四川、贵州接壤,西南面和镇雄县毗邻。它位于扬子准地台松坎拗陷娄山断褶带。区内发育的地层有震旦系至侏罗系(缺泥盆系和石炭系),厚逾五千米,以海相和滨海相碳酸盐类为主,上二迭统含煤系位于峨眉玄武岩及下三迭统卡以头组之间。全区构造由北而南主要有中坝、威信、两河三大背斜和介于其
Weixin County is located in the northeast corner of Yunnan Province, north and south sides of the border with Sichuan and Guizhou, southwest and adjacent to Zhenxiong County. It is located in the Yangtze platform quasi-Songkan depression Lushan fault fold belt. The strata developed in the area are Sinian to Jurassic (lack of Devonian and Carboniferous) strata over 5 km thick, with marine and coastal facies carbonates as the Upper Permian coal-bearing system located in Emei Basalt and the next triad card between the first group. The structure of the region from north to south mainly in the dam, prestige, the two anticlines and between