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关于南方震旦系的下界,主要有两种意见:(1)以澄江组或莲沱群的底板为下界;(2)往下移到包括昆阳群、板溪群及其相当岩系。主张后一意见主要根据葛利普“寒武系之下的不变质或只轻变质的沉积岩系属震旦系”的概念,及“滹沱页岩群”和“东峪灰岩”等实例,认为昆阳群和板溪群等变质并不很深,而在岩性上有其相似之点,故可以归入震旦系。经过多年来的研讨,大多数趋向于将昆阳群及其相当岩系归属于前震旦系。但问题并不就此解决。地质工作者在考虑震旦系界限时,有时抱着华北燕山地区高振西等
There are mainly two opinions on the lower bound of the Sinian system in the south: (1) taking the bottom of the Chengjiang Formation or the Lituo Group as the lower boundary; and (2) moving downwards to include the Kunyang Group, Banxi Group and their equivalent rock series. Advocating the latter opinion is mainly based on the concept of “the Sinian system of the metamorphic or metamorphic sedimentary rocks under the Cambrian system” and the examples of “Heduo shale group” and “Dongyu limestone” Yang group and Banxi group metamorphism is not deep, but in lithology has its similarities, it can be classified as Sinian. After years of research, most tend to belong to the Kunyang Group and its equivalent rock series before the Sinian. But the problem is not solved. When considering the boundaries of the Sinian, geologists sometimes hugged West China in the Yanshan area of North China