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一、地质概述本文所述地区位于云南东南部,是华南地台上的一个凹陷带。区内泥盆系、石炭系、二迭系、三迭系、第三系及第四系均甚发育,塞武、奥陶系只在南部稍有出露。各系的特点均为由碎屑沉积(砂质页岩、页岩)渐渐过渡为纯化学沉积(石灰岩夹燧石透镜体或团块)。总厚度不超过3,500米。岩层褶曲平缓而开阔。区内大断裂甚多,较著者一为南北向,长30余公里;一为北西向,与前者约成45°角。实际资料证明,
First, the geological overview The area described in this article is located in southeastern Yunnan, southern China is a sink on the platform. In the area, Devonian, Carboniferous, Permian, Triassic, Tertiary and Quaternary are all well developed. The Sewu and Ordovician are only slightly exposed in the south. All facies are characterized by a gradual transition from clastic sedimentary (sandy shale, shale) to pure chemical sedimentary (limestone intercalated with flint bodies or clumps). The total thickness does not exceed 3,500 meters. Rock fold smooth and open. A large number of large faults in the region, one more for the north-south direction, more than 30 kilometers long; one for the northwest, with the former about 45 ° angle. The actual data shows that,