论文部分内容阅读
在讨论早前寒武纪花岗绿岩区问题时,不仅绿岩带,而且其基底在地质学、岩石学和地质年代学方面的问题,均引起人们越来越大的兴趣。这不难理解,因为原始陆壳的成分、结构和形成等问题,都属于早前寒武纪地质学中最有争议的关键问题。关于绿岩带具有硅铝质基底的概念,得到了愈来愈多的研究者的赞同。此概念是基于地质观察的结果而形成的,并得到了近年来放射性年代学的专门研究的证实。不久以前还盛行着另一种假说,即认为绿岩带的
In discussing the problems of the Early Precambrian granite greenstone area, not only the greenstone belt, but also its basement problems in geology, petrology and geochronology have aroused more and more interest. This is not hard to understand because the problems of the composition, structure and formation of the original continental crust are among the most controversial issues in the early Precambrian geology. The concept of silica rock with greenstone substrate, get more and more researchers agree. This concept was based on the results of geological observations and was corroborated by specialized studies of radiochronology in recent years. Not long ago another popular hypothesis prevailed was the greenstone belt