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大理洱海东岸(以下简称海东)地区位于扬子地台西缘的西南隅,盐源-丽江陆缘裂谷带的最南端,是三个构造单元的结合部位(图1)。西侧以小金河-红河断裂(本区称为洱海深大断裂)为界与三江地槽褶皱系相邻,东以程海深大断裂为界与康滇地轴相连。新生代以来的裂陷运动在该区形成了东、西两个引人注目的裂陷带。不同方向的主干岩石圈断裂的交
The east coast of Erhai Lake in Dali is located at the southwestern margin of the western margin of the Yangtze Platform and the southernmost tip of the Yanyuan-Lijiang continental margin rift zone, and is the binding site of three tectonic units (Figure 1). On the west side, it adjoins the Sanjiang Gully Fold System with the boundary of Xiaojinhe-Honghe Fault (known as Erhai deep-sea fault) in this area, and connects with the axis of Kang-Dian axis in the east by the Chenghai deep fault. The rifting movement since the Cenozoic formed two striking rift zones in the area, east and west. The different directions of the main lithosphere fracture intersection