辽东古裂谷西段辽河岩群地层学研究的几个问题及进展

The Advance of Some Problems About the Stratigraphic Research of Liaohe Lithogroup in the Western Liaodong Rift

在讨论了辽河岩群变质、变形、剩余沉积特征基础上提出了构造变质岩石地层单位的概念及采用岩群、岩组、岩段等单位名称系统。提出辽河岩群１个岩群、３个亚岩群、９个岩组的划分方案。介绍了江还山岩组底部石英岩－碳质片岩岩石组合标志层以及杨树沟岩组七岩段由叠层石正常－倒转－正常标定的组合构造带的发现及意义。论证了辽河岩群南、北区域的可对比性。对辽河岩群层序地层格架进行了尝试性分析。

On the basis of the metamorphism, deformation, and sedimentary characters of Liaohe lithogroup, the concept of tectonic -metalithostratigraphic unit is put forward, and meantime the nomenclatures such as lithogroup, lithoformation, and lithomember are adopted. In this paper, the authors divide the Liaohe lithogroup into three sublithogroups and nine lithoformations, discover the key bed made up of quartzite and carbonous schist in the bottom of Jianghuanshan lithoformation, distinguish the tectonic zone from the seventh lithomember of Yangshuguo lithoformation accordihg to the diagnosis of stromatolites geopetal criterial, prove the correlatability of the Liaohe lithogroup between southern and northern regions, analyze the Liaohe lithogroup stratigraphic framework experimentally.