再论辽东前寒武纪地层的划分和对比——“辽河群”一词使用的商榷

<正> 自1938年斋藤林次建立辽河群以来,人们对辽河群的概念始终是它代表着鞍山群和辽东震旦系之间的一套地层。它的层序是下部片岩系(浪子山组)、大石桥组和盖县组。后来虽然有些变动,但大体上仍然保持着原来层序的概念。自1974年以来,实施了采用统一地层系统,将辽河群由下到上划分五个组:浪子山组、里尔峪组、高家峪组、大石桥组和盖县组。于是就出现两个关键问题:辽吉地区的含硼岩系是在浪子山组之上,还是之下?在辽河群建群的标准剖面地区即大石桥区,大石桥组是在盖县组之下,还是之上?

A REVIEW OF THE PRECAMBRIAN STRATIGRAPHIC DIVISION AND CORRELATION OF EASTERN PARTS OF LIAONING AND JILIN

Since the Liaohe Group was named by Saido in 1938, the term has implied the stratigraphic unit between the Anshan Group and Sinian System. The present Liaohe Group is divided into five formations from bottom to top:Langzishan, Lieryu, Gaojiayu, Dashiqiao and Gaixian formations. Consequently come out two key questions: is the boron-bearing rock series in the eastern part of Liaoning over the Langxishan Formation or under it and is the Dashiqiao Formation under the Gaixian Formation or over it? As a result of our study,four groups are contained in the present Liaohe Group, i.e. Kuandian Group, Caohe Group, Dalizi Group and Liaoyang Group.The contact relations between them are unconformable.The two questions mentioned above are reviewed in this paper to explain why the Liaohe Group is improper. According to the demand of "Stratigraphical Guide of China", the term of Liaohe Group should be abandoned.