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内蒙古东部处于中亚造山带东端,大地构造单元主要由额尔古纳―兴安地块和松嫩地块组成。长期以来,该区晚古生代变质作用受海西地槽褶皱系观点的影响,很多人认为区内晚古生代地层遭受了海西期低绿片岩相的区域变质作用
The eastern part of Inner Mongolia is located at the eastern end of the Central Asian orogenic belt. The tectonic units are mainly composed of the Ergun-Xingan massif and the Songnen massif. For a long time, the Late Paleozoic metamorphism in this area has been influenced by the Hercynian Trough fold system. Many people think that the Late Paleozoic strata suffered regional metamorphism in the Hercynian low-greenschist facies