Acoustic stratigraphy of the Quaternary in the south of the Oujiang River Estuary

Based on the signal-channel seismic data of air-gun source and lithological data of the Borehole 1, the Quaternary stratigraphy in the south of Oujiang River estuary was recognized. By comparing six stratigraphic units （SU1～SU6） interpreted from seismic profiles and sedimentary data from Borehole 1, we found that the seismic units agree well with the borehole ones. The sedimentary units of SU1 and SU3 are marine deposits corresponding to seismic units of MIS 1 and MIS 3, while SU2 and SU4 are fluvial or fluvial-lacustrine deposits corresponding to MIS 2 and MIS 4, respectively. The SU5 unit is fluvial-marine deposit that can be assigned to MIS 5, whereas SU6 is fluvial-lacustrine deposit corresponding to MIS 6 and the older ones. The establishment of the Quaternary stratigraphic framework and the analysis of sedimentary sequence in this study provides an important reference for the Quaternary geology and paleo-environment evolution of the East China Sea.