THE CARBONIFEROUS-PERMIAN STRATIGRAPHIC DIVISION AND CORRELATION IN THE SONGLIAO BASIN AND ITS PERIPHERAL AREAS

The Carboniferous-Permian strata in the Songliao Basin and its surrounding areas can be divided into two stratigraphic regions, including five areas and nine sub-areas, on the basis of the latest study on Late Paleozoic geotectonic evolution in Northeast China and stratigraphic development and biopaleogeographic characteristics. The sequence of each stratigraphic area is established based on the provincial lithostratigraphic revision work with regional geological survey and stratigraphic research in recent years. The geological time of each formation is basically defined and incorporated into the latest international chronostratigraphic system with the comprehensive study method of biostratigraphy and isotope chronostratigraphy, according to existing fossil information, particularly the latest microfossils like conodonts and sporomorph, and isotopic dating data. At the end, with horizontal comparison between different stratigraphic areas, the Carboniferous-Permian stratigraphic division and correlation framework is established in the Songliao Basin and its surrounding areas in the international chronostratigraphic system.