摘要
早前寒武纪地壳演化的具体表现可以从增生作用和陆壳再造作用这两个方面进行描述按照增生表壳岩系类型可以将早前寒武纪大陆地壳划分为绿岩型和沉积型陆壳增生区；按陆壳再造作用的类型可以将早期大陆地壳划分为变质改造型和重熔分异型陆壳再造区对区域上绿岩型表壳岩系、沉积型表壳岩系；TTG岩系、钾质花岗岩系等与地壳演化进程的关系作了概括．不同类型陆壳区反映了地壳增生进程是不一样的，增生地壳受再造作用的程度以及遭受的陆壳再造作用类型也可以是不同的，而一个完整的地壳演化旋回应包含活动增生、陆壳再造与克拉通化作用，一个地壳区地壳演化往往是这些作用交替发展并形成与邻区地壳演化进程的差异．进而提出了早前寒武纪克拉通基底建造分析的思路。
The concept of crust evolution is very imPOrtant but difficult to study, so how to reveal crust evolution by early Precambrian metamorphic formations analysis is the main aim Of this paper. The author thinks that crust evolution can be described with two processes crust accretions and continental crust reworking. In the light of the analysis of the basemental metamorphic formation, North China craton, this Paper points out some thoughts, principle and models for metamorphic formations and some hypotheisss on crustal evolution. Also, some related questions are tackled.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
1998年第S1期88-98,共11页
Chinese Journal of Geophysics
关键词
早前寒武纪
表壳建造
陆壳再造作用
陆壳区
地壳演化进程
Early Precambrian, Supracrustal formation, Continental crust reworking,Continental crustoprovince, Crust evolutional process.
