论文部分内容阅读
从已收到的一批专题讨论会的摘要中可以看出尚存在一些悬而未决的疑难问题;这些疑问可以认为是以往专题讨论中一直存在着的焦点问题,现列举如下: 1.应该寻找一种对所有绿岩带来说统一的构造环境,还是绿岩带仅象征着一定范围的构造环境?如何加以识别?绿岩带是大面积造山带的一部分?绿岩带是外来的吗?我们又如何证明/反驳他们? 2.是否早太古绿岩带(如塞卢奎、巴伯顿、彼得斯堡、皮尔巴拉、依苏阿)不同于晚太古绿岩带?如果是这样,那么是从哪些方面来考虑的吗?在绿岩带内对于岩石类型的定量估计上几乎没有什么已汇编的资料:这是首要目标。此外,因为许多绿岩带都是
From the summaries of a number of symposia that have been received, it can be seen that there are still some unresolved and difficult problems that can be considered as the focus of the previous thematic discussions, as follows: 1. There should be a Is it a universal tectonic setting for all greenstone belts or does greenstone belonged to only a range of tectonic settings? How to identify it? Greenstone belts are part of a large orogenic belt? Are greenstone belts exotic? How to prove / refute them? 2. Is the Early Archaean Green Belt (such as Ceruque, Barberton, Petersburg, Pilbara, Esuah) different from the Late Archeanite? If so, then Where do you think about it? There is hardly any compiled information on the quantitative estimation of rock types within the Greenstone Belt: this is the primary goal. In addition, because many green rock belts are