Magmatism age and magmatic deep process of the middle-west part of north China block-Taking Zijinshan alkali complex in the east of Ordos basin as example

摘要

The research of continental dynamics of China in contemporary has come into the stage of setting up dynamic model of Mesozoic-Cenozoic evolution of North China Block and its deep processes. Ordos basin, in the middle-west part of North China Block, is a polycyclic superimposed basin after the period of Indosinian (Ren Jishun, 1997). In Mesozoic, it is located in the binding domain of east extension and west compress tectonic regions influenced by multi-stage repeated extension and compression, belong to composite intracraton basin reformed- superimposed basin (Li Sitian, 1997; Liu Chiyang et al., 2006). Due to the relatively complicated and special expressive form of deep magmatic activity, it is difficult to directly find them out and so that it is often ignored. The informed research show that in the Triassic-Jurassic period, the distribution range of Ordos basin is relatively wide, that is it may surpass L(u)liang Mountain area, middle part of Shanxi province - Linfen rift [Fen river - Wei river rift] and reach Taihang Mountain area.