ON THE FORMATION MECHANISM OF THE MESO-CENOZOIC BASIN-RANGE SYSTEM AND ITS RELATED GEOLOGICAL PHENOMENA IN EASTERN CHINA

The Meso-Cenozoic basin-range system and its related geological phenomena in easternChina originated at the stage of the NNW compression of the Kola plate during the LateJurassic-Early Cretaceous and at the stage of the NE compression of the indian plate sincethe Late Cretaceous. They are controlled by the plane X-type fracture of the upper crustcompresso-shear normal fault-which was produced by the combined action of the horizontalcompressive force and gravity. The loading state and deformation of the hanging wall of thefault under gravity are similar to a centilever beam with the plastic layer in the middle crustas the elastic foundation and with the fault surface as the free end ithus,under the action ofthe curved moment and shear force of the beam,a listric down-faulted basin was formed. Alot of plastic materials in the middle crust were pressed to the footwall and the footwall uplifted as a fault-uplift mountain during the large-amplitude subsidence of the basin basement,so that the Yinshan,Yanshan,Qinling and Taihang mountains are juxtaposed with the downfaulted basin and both of them were formed at almost the same time and have a similar scale.The rise of high-temperature plastic materials rich in useful elements in the middle crust alsoled to production of the metamorphosed nuclear complex, magmatism, mineralization, highheat flow and geological hazards.