云南保山盆地的形成与演化

THE FORMATION AND EVOLUTION OF BAOSHAN BASIN, YUNNAN PROVINCE

盆地中识别出三个不整合面，即Ｔｇ、Ｔ３和Ｔ０。其拉张史可分为两大阶段：（１）Ｔｇ→Ｔ３，拉张强度渐增期；（２）Ｔ３→现今，拉张强度渐弱期。保山盆地的演化阶段为：（１）盆地初始形成期（Ｔｇ→Ｔ５）；（２）盆地扩张定型期（Ｔ５→Ｔ１）；（３）盆地萎缩充填期（Ｔ１→现今）。

Three unconformities i.e. T g,T 3,and T 0 have been identified in Baoshan basin. Its extensional history can be divided into two stages, which are the increasing extensional intensity period from T g to T 3 and the decreasing extensional intensity period from T 3 to today. According to the mentioned above, the process of formation and evolution of Baoshan basin can be subdivided following stages, i.e. the primary formation stage(T g→T 5), the extensional development stage( T 5→T 1), and the filling stage (T 1→today).