Sequence stratigraphy around Sanggou Bay since the Late Pleistocene

High-resolution seismic reflection data and depositional stratigraphy of typical cores were studied in detail to determine the sequence stratigraphy since the Late Pleistocene around the Sanggou Bay off Rongcheng in Shandong Peninsula. Results show that the Late Pleistocene strata above bedrock in the study area could be subdivided into three seismic units (SU2, SU1-2, SU1-1 in descending order), and they are well corresponded to three depositional units (DU2, DU1-2, DU1-1) of borehole. The sediment sequence covered deposits during the sea-level lowstand of LGM and the sea-level highstand of early-middle Holocene, comprising lowstand systems tract (LST) (deposits of fluvial to incised-channel filling facies), transgressive systems tract (TST) (deposits of tidal sand ridges and littoral facies); and the highstand systems tract (HST) (deposits of neritic facies since). The LST varies considerably in thickness of 0～15 m due to river erosion, while the TST is widely distributed in the thickness of 4.5～5.5 m, and the HST gradually thickens seaward from SW to NE with a maximum thickness of more than 30 m in the study area.