华北地台北缘海西期花岗岩类地球化学特征及构造环境探讨

Approach for Structural Environments and Geochemical Charactristics of Heixi Period Granitoid in the Northern Margin of North China Platform

本文论述了华北地台北缘多条海西期花岗岩带的常量元素、微量元素和稀土元素分布特征，由北带至南带花岗岩类具有成分空间变化规律，微量元素特征类似于同碰撞花岗岩中微量元素分布特征。从而论述了在晚古生代期间蒙古洋壳继续俯冲消减在华北增生板块之下，多条海西期花岗岩带继承了早古生代岛弧环境成分极性空间变化规律，同时又具有同碰撞花岗岩的特征，探讨了古生代期间蒙古洋壳和华北陆壳板块运动发展历史。

The distribution features for constant and trace and rare-earth eoement ofmany streak Heixi period granite zones in the northern margin of North China platform arediscussed by the paper. From north to south, granitoid of the tectonic zones are providedwith regular space changes of composition and trace element distributed characteristicsbelong to collision granite in the meantime. In Late Palaeozoic Era, Mongolia oceaniccrust was continue subduction under accretionary plate of North Chilla. Many stcakgranite zones in Heixi period are carried on island are enviionment change regular ofpolarity spece in early Palaeozoic Era. It simultaneously has distinguishing feature ofcollision granite in the meantime. Finally, the development history of platc movenment forthe Mongolia Oceanic crust and the North China continental crust are explorated.