Neoproterozoic stratigraphic correlation of Subei-Huainan in China

Abstract

Subei-Huainan in the southeastern margin of the North China platform is a key area of convergence of China’s north-south stratigraphic correlation of Neoproterozoic. Due to the lack of fossils, the Neoproterozoic stratigraphic correlation is still a difficulty in this area. The division of Neoproterozoic strata and the establishment of the correlation framework of the stratigraphic sequences have been done through recognizing the regularity of meter-scale cycles by measuring the outcrop of Neoproterozoic strata and using the Fischer diagram and the sea-level curve of transgressive-regressive by the maximum flooding sedimentary and molar teeth carbonate sedimentary. The maximum flooding sedimentary which becomes cycle sequence comparison of sign is isochronous in the same basin and is a key of cycle sequence comparison although paleogeographic environment and sedimentary sequence may be different in the sedimentary strata of the same geologic time. Molars carbonates, having specific geological distrution time and depositional environment and mainly developing in the ramp environment of the platform edge in the 1500-650 Ma, are the new symbol of the stratigraphic correlation in the Neoproterozoic. Because of the missing of the fossil record, the maximum flooding and the molar-teeth carbonate sedimentary, as the new research ideas, are used in stratigraphic division and correlation.

Keywords

Fischer diagram / sea-level change / molar-teeth carbonate / maximum flooding sedimentary / Neoproterozoic / Subei-Huainan

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