Holocene sediment accumulation on the Bohai Sea: depocenters, sediment sources, and oceanic and tectonic influences
The Holocene sediment centers on continental shelves recorded rich information that have great value for revealing the shelf sea environment, climate change and human activities. Different from most shelf seas, the Bohai Sea is a highly enclosed sea with unique geologic setting, which make it as an ideal place to study river sediment dispersion, transport and deposition on the shelf. However, it is still unclear whether there are depocenters in the Bohai Sea, and if there are, what factors control their formation and development. In this paper, we used these data to clarify the Holocene sediment centers and the sediment budget. we identified four large Holocene sediment centers on the Bohai Sea, which account for more than ~36% of the total amount of sediments. The formation and development of these Holocene sediment centers were controlled by tectonic movements and oceanic dynamics. The Holocene sediments on the Bohai Sea shelf mainly come from the surrounding rivers, especially from the Yellow River, and partially from the Bohai Strait area (~23%). The preliminary estimate shows that approximately half of the sediments dispersed from the estuaries were preserved on the Bohai Sea shelf, and the rest were transported to the Yellow Sea. The unit of the thickness is meter and the cell is 500m*500m. Data format is as follows: Longitude Latitude thickness 117.7677836 38.6716941 8.54 117.7677836 38.6761964 8.46 The unit of the thickness is cm/ka and the cell is 500m*500m. Data format is as follows: Longitude Latitude sedimentary rate 117.7677836 38.6716941 94.90 117.7677836 38.6761964 94.04
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Dataset includes sediment thickness, Holocene depositional rate, calibrate age and image of seismic profile used in the paper. Sediment thickness was obtained from high-resolution subbottom profiles collected in recent years in the Bohai Sea. We picked up the top horizons and the bottom horizons of Holocene deposits through Subbottom profile interpretation software (®SB_Interpretation) and used a velocity of 1600m/s for time-depth conversion. The Holocene sedimentary rate was calculated from the thickness and 10 cal kyr was taken as the total accumulation time of the Holocene sediments in the Bohai Sea. Boreholes were collected from the available published literature and (AMS) 14C in some boreholes were calibrated using Marine 20 database for marine samples, IntCal 20 database for freshwater samples and Mixed Marine NoHem database for mixed samples of CALIB 8.1 (Stuiver et al., 2021).