关键词: 渤海, 潮流沉积, 老铁山水道, 冲刷槽, 潮流沙脊, 潮流沙席, 沉积环境

Abstract: The typical tidal sedimentations have been discovered in the eastern of the Bohai Sea, which consists of the Laotieshan
Channel, the Liaodong Shoal tidal sand ridges, and the Bozhong Shoal tidal sand sheets. In this paper, the sedimentary features and the
seismic reflections of the tidal bodies in eastern Bohai Sea are analyzed based on the new high-resolution seismic data from the marine
geological survey and the comparison with water depth changes. Combined with the lithology, 14C age data, and stratigraphy of borehole
CD5, four stratigraphic sequences have been identified, including the fine sand strata of land facies of MIS4, the silt and clay strata of
nearshore facies of MIS3, the silty clay and fine sandy silt strata of land facies of MIS2, and the sand strata of marine facies of
Holocene. Furthermore, the sedimentary facies of the Holocene strata can be divided into nearshore, neritic, and tidal environment. The
analysis of the four sedimentary facies reveals the evolution of sedimentary environment since MIS4.

Key words: Bohai Sea, tidal sedimentation, the Laotieshan Channel, scour trough, tidal sand ridge, tidal sand sheet, sedimentary
 environment.