During extensional activities of Late Cretaceous to Eogene, intense upwelling of asthenosphere happened under the fault zone, leading to lithospheric necking in pure shear model.

• 断裂带在晚白垩世-早第三纪的伸展活动中,软流圈发生了强烈的上隆,岩石圈出现了显著的细颈化,属于纯剪切伸展模式。