关于C型埃达克岩成因的再探讨

Reappraisal of the origin of C-type adakitic rocks from East China

文中回顾了对C型埃达克岩认识的过程,归纳了C型埃达克岩的产出特征、存在问题、研究意义及今后研究的方向,指出中国东部C型埃达克岩是高钾钙碱性的,可能是变质的中钾和高钾的中基性岩在高压条件下部分熔融形成的。不同于O型埃达克岩,它的成因、源区特征、熔融机制,是今后研究的重点,需要大量实验研究的支持。钾质的C型埃达克岩是新的大陆构造学研究的切入点,比钠质的O型埃达克岩具有更重要的意义。

A comprehensive summary of the definition, mode of occurrence and remaining problems in the stud- ies of C-type adakitic rocks is given in this paper for better understanding the implications of C-type adakite rocks in East China. It is pointed out that C-type adakitic rocks are high-K calc-alkaline and are likely derived from partial melting of intermediate- to high-K meta-andesitic-basaltic rocks under the high pressure condition. Un- like things of O-type adakite, the origin, source rocks and partial melting processes of C-type adakite remain un- clear and hence more experimental work may have to be involved in future work.