SHALLOW ACOUSTIC STRATIGRAPHY OF THE LATE QUATERNARY IN THE ZHOUSHAN ISLANDS OF HANGZHOU BAY

Based on the high-resolution seismic profiles and borehole data acquired from the Zhoushan Islands, five seismic reflectors, named T₁、T₂、T₃、T₅、T_R, are identified and five stratigraphic units, namely SU 1、SU 2、SU 3、SU 4 and SU 5 established for the late Quaternary sequences. Through the correlation between the shallow seismic profiles and the boreholes, combined with the analysis of sedimentary facies, AMS¹⁴C and OSL dating and paleomagnetic analysis of the cores, we infer that the five seismic units were formed in MIS 1, MIS 2, MIS 3, MIS 5, Middle Pleistocene and earlier sedimentary periods, respectively, and as the results, the stratigraphic framework of the Late Quaternary established in this paper has founded the scientific basis for revealing the sedimentary evolution of Late Quaternary paleoenvironments and the process of "sources to sink" of the sediments.