Abstract:

Based on the integrated research of intermediate structure, regional faults, Cenozoic basins and threedimensional numerical simulation, we further analyze the impact of the Nanning Cenozoic asthenosphere upwelling plume tectonics on the shallow surface structure of the study area. A series of transitional structures, generated at the margin of the asthenosphere upwelling plume, affect the activities of NEtrending and NWtrending regional faults near the central of plume. Simultaneously, during the asthenosphere upwelling and flowing to southeast, the plume caused the movement of the upper crust mass, which led to the following events: the extension of the center, the west and the north of the plume; the formation of fault basins on the shallow surface; the enhancement of the activity of NEtrending and NWtrending regional faults in the southeast; the generation of the Lingshan midstrong seismic active region. The conclusion has further been tested by the threedimensional numerical simulation.

Key words:

Key words: Nanning Cenozoic asthenosphere upwelling plume;shallow surface structure;intermediate structure;region fault;fault basin;threedimensional numerical simulation