云南宁蒗新生代盆地的形成与演化

宁蒗盆地地处扬子古陆块的活动边缘,在构造上亦属吸纳和调节印度-欧亚大陆碰撞应力应变的构造转化带。为了研究云南宁蒗地区新生代盆地形成、演化与区域构造的关系及盆地类型,通过对宁蒗地区开展的数幅1:5万区域地质调查,分析了宁蒗盆地内部及相邻地区的构造格架特征,认为盆地的形成及演化均受控于断裂; 通过对宁蒗新生代盆地的沉积建造、控盆构造的时空演化及区域地质背景的研究,认为宁蒗盆地是比较典型的走滑拉分盆地,其演化经历了3个阶段: 古新世末至始新世初盆地拉分打开阶段、始新世初至始新世末拉分盆地沉积阶段、始新世末至中新世盆地改造阶段。

Formation and evolution of Cenozoic basin in Ninglang of Yunnan Province

Ninglang Basin is located on the active edge of Yangtze Paleo-Continent Block,and it is a structural transformation zone, which absorbed and regulated the stress and strain of India-Eurasia collision. In order to study the relationship between the formation and evolution of Cenozoic basins in Ninglang area of Yunnan Province and its regional structures and basin types, the authors analyzed the structural framework of Ninglang Basin and its adjacent areas, through several 1:50 000 regional geological surveys. The results show that the formation and evolution of the basin are controlled by faults. Ninglang Basin is believed to be a typical strike-slip pull-apart basin through the study of the sedimentary construction, spatial evolution of the basin-controlling structure and the regional geological background. The evolution has gone through three stages: pulling apart and opening stage from the Paleocene to Eocene, pull-apart basin deposition stage from the beginning of the Eocene to the end of the Eocene, and the basin reform stage from the Eocene to the Miocene.