TECTONIC EVOLUTION AND GENESIS OF THE LATE MESOZOIC-CENOZOIC BASIN-AND-MOUNTAIN SYSTEM OF NORTHEAST CHINA

The basin-and-mountain system of Northeast China formed and developed mainly in the late stage of Late Jurassic-Neogene, involved two processes of tectonic development:the late Late Jurassic-Early Cretaceous small basinand-mountain (basin-and-range) stage and the Late Cretaceous-Neogene big basin-and-mountain(basin-and-mountain) stage. The basin-and-range stage originated in the Zhangjiakou stage, when the Northeast Highland transformed into the basin-and-range system, developed in the Yixian-Jiufotang stage, withered in the Shahai-Fuxin stage, and finally ended in the Zhanglaogongtun stage (Dongshan stage). The basin-and-mountain stage experienced the early Late Cretaceous huge depression, the late Late Cretaceous withering of depression, the Paleogene massive rift, and finally the Neogene post-rift sag. It seems that the Pacific plate remarkably effected the formation of the basin-and-mountain system. However, neither the plate, nor mantle plume and super plume are able to form such massive and NNE-striking Mesozoic-Cenozoic magmatic belt and basin-and-mountain system. It is more possibly the result of super mantle thermal zone and mantle plume action together with West Pacific plate subduction, under the background of East Asian multi-direction plate convergence.