关键词: 深部构造, 裂谷, 构造演化

Abstract: We have made further analyses to the geophysical data of Luyang-Haicheng-Donggou profile which transects the Liaohe rifting basin. These data include deep seismic sounding,gravity,magnetotelluric and heat flow measurements. It is found that the crust mantle transitional zone is characterized by the multi thin layers beneath the Liaohe rift which is quite different from those under the uplifted platforms on the both sides. The structural features of the thin layers,velocity,temperature,crustal low velocity layer and uppermost asthenosphere show that the tectonic evolution process has migrated from west to east for the Liaohe rift. The current front of movement of the upper mantle material has left from the center of the rift and moved eastward to the Ximu near the Jinzhou seismic zone. It is suggested that the movement of deep material is the primary dynamic factor for the generation and lateral migration of the Liaohe rift.

Key words: Deep structure, Rift valley, Structural evolution