论文部分内容阅读
造山运动过程,包括褶皱、变质和花岗岩化等多个阶段,它的主要化学结果是某块大陆壳的形成。由于花岗岩类是大陆壳的主要组成部分,因此,花岗岩类的成因问题就和大陆的起源与演化问题有着密切的关系。现已提出两种极端的理论: (1)大陆壳是在整个地质时期里通过连续的分异作用由地幔形成的。 (2)大陆壳是在地球历史的早期由地幔一次分异形成的,以后这种物质便不断再循环到新的地壳中去。
The orogenic process, which includes multiple stages of folds, metamorphism and granitization, has the major chemical consequence of the formation of a continental crust. Since granitoids are the major component of the continental crust, the genesis of granitoids is closely related to the origin and evolution of the continent. Two extremist theories have been proposed: (1) The continental crust is formed by the mantle through continuous differentiation throughout the geological period. (2) The continental crust was formed by the differentiation of the mantle in the early stages of Earth’s history, after which it was continually recycled into the new crust.