云南保山盆地的形成与演化

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THE FORMATION AND EVOLUTION OF THE BAOSHAN BASIN, YUNNAN PROVINCE

摘要: 保山盆地是云南西部第三系盆地的典型代表,盆地可划分为西部断阶带、中部坳陷带和东部斜坡带,为一西断东超的典型箕状盆地.保山盆地从北到南,其总拉张量有从小→大→小的变化特征.盆地拉张史可分为3个旋回.在盆地中可识别出T_g、T₃和T₀3个不整合面.盆地的形成演化可分为初始形成期、扩张定型期和萎缩充填期.保山盆地是在区域挤压背景下,由于地处地壳深部的岩石隆升到地壳浅部和地表自由空间后,先前聚集的压应力突然释放,引起应力松驰形成的.
- 拉张史 /
- 盆地演化 /
- 保山盆地
Abstract: The Baoshan basin is a typical Tertiary basin in west Yunnan Province,which is composed of western fault zone,central sag zone and eastern slope zone.The extenslonal quantity is from small,to big and to small from the north to the south of the basin.The extensional history consists of three cycles.Three un conformities can be recognized in the basin.The process of the formation and evolution of the basin can be divided into the primary formation stage,the extensional development stage and the filling stage.

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